Abstract: A method and apparatus for removing coatings from the hull of a ship using a steered magnet vehicle supported by the adhesion force only of a permanent magnet to the surface to be treated. Using an ultra-high pressure water jet system and method for removing coatings, paint, deposits, organic and inorganic from hulls without harming the substrate material and to provide a superior surface for the application of subsequent coatings.

Abstract: An apparatus and method for cleaning a boat in the water without pollution. Included are a floating, water-impervious basin and a filtration system. Included are a floating, water-impervious basin and a filtration system. The basin has side walls sloped downwardly to a nadir spanning substantially the full length of the basin, an opening allowing the surrounding water to enter the basin as well as ingress and egress of boats, and a gate movable into a closed position forming a cleaning chamber in the basin. After a boat is in the chamber, the gate is closed to create a pool of water in the chamber isolated from the surrounding water and in which a boat may float while being cleaned. As the gate is closing behind a boat, it allows water to pass therethrough thereby to facilitate closure, and yet is substantially sealed when closed. The filtration system includes a collector pipe lying submerged in the nadir and a pair of return pipes that float on the water in the basin.

Abstract: The present invention relates to an underwater apparatus, system and method for inspecting and determining the condition of a submerged structure. More particularly the present invention utilizes acoustical devices for the positioning of an inspection vehicle, with respect to the structure to be inspected.

Abstract: A method and apparatus for controlling foulant organisms on the hull of a resting ship that employs an enclosure material to enclose the ship's hull. Separation devices are attached in a grid pattern to the interior surface of the enclosure material to maintain a uniform distance between the material and the ship's hull. A thin, semi-absorbent, slightly tacky liner material is fit over the separation devices to catch foulant that falls from the hull of the ship. Cavitation produced by pulsating, ultrasonic sound waves emitted by transducers mounted beneath the waterline on the interior of the ship removes the foulant. Alternatively, the transducers are placed in watertight housings and mounted on the separation devices. In another embodiment of the invention, the enclosure material remains in place until the ship is ready to leave port. In yet another embodiment of the invention, the enclosure material is deployed and removed using winches and attached cargo ropes.

Abstract: A robot capable of moving against gravity uses at least one vacuum cup assembly having a port for applying a lubricant on the working surface so the cup may slide on the surface as the robot is maneuvered with the aid of powered wheels. The wheels and vacuum cut assemblies are coordinated to move on varied surfaces. The robot module may be equipped with various task-performing assemblies, and may be employed in caravans, trains, or separately in swarms.

Abstract: According to one form of the invention, and with reference to FIG. 1, there is provided a cleaning means in the form of a boat hull cleaner 1. The boat hull cleaner 1 is used by a person 2 to clean the hull 3 of a boat 4 below a waterline 5. The boat hull cleaner 1 has a telescoping handle 6, a buoyancy control means 7, and a cleaning portion such as a scrubbing brush 8. The buoyancy control means 7 can be filled with water or some other fluid to regulate its buoyancy. When the boat hull cleaner is in use the buoyancy control means 7 serves to encourage the scrubbing brush 8 against the hull 3 to facilitate cleaning of the hull 3.

Abstract: The device of the present invention, an enclosure for partially submerged boat keels, rudders and lower units, is a box-like structure constructed to enclose those described parts extending downwards from the hull of a boat when the boat is lifted from the water on a hoist in such a manner as to prevent direct contact with the water. The device is positioned about the submerged portion of the keel, rudder or lower unit and then emptied of water, resulting in flotation of the upper portions of the enclosure to a level above the surrounding waterline. By thus preventing continuous direct contact with water during periods of storage, the adverse effects of bottom growth and gelcoat blistering are reduced or eliminated, thus enhancing performance underway and reducing maintenance.

Abstract: A portable, diver-operated device provides an improved method of cleaning surfaces underwater. The device includes a source of ultrasonic energy in a housing that has a compliant portion around an opening to engage and fit around a contaminated surface and clean it with the ultrasonic energy. The housing is made from material that diminishes transmission of the ultrasonic energy to ambient water. The compliant portion seals the source, the contaminated surface and some water from ambient water to concentrate the cleaning power of the source on the surface and to prevent transmission of harmful levels of energy outside of the device and through ambient water.

Abstract: A method of removing fouling from an underwater surface (16) coated with an antifouling paint involves generating, by means of at least one treating member (9, 10) spaced from the underwater surface to be cleaned, turbulence within the water surrounding the underwater surface so as to dislodge marine fouling adhered thereto. The invention also relates to apparatus for cleaning an underwater surface.

Abstract: A system for inhibiting marine organism growth on underwater surfaces provides an electric current generator which causes an electric current to flow proximate the underwater surface. A source of power, such as a battery, provides electrical power to the electric current generator. The flow of current passes from the underwater surface through water surrounding the surface or in contact with the surface, and a point of ground potential. The point of ground potential can be a marine propulsion system attached to a boat on which the underwater surface is contained.

Abstract: The present invention provides a method of preventing adhesion of aquatic organisms on structures in the water such as ships. In the method, the underwater part of a structure in the water is covered up with the sheet. The sheet is made of a polyolefin and less than 1 mm thick, and has apertures each of which has a surface area of 1 to 60 mm2, the surface area in total of the apertures occupying 20 to 80% of the entire surface area of the sheet. The sheet has a tensile strength of 15 to 37% as measured under JIS L1096A and a tear strength of 3 to 9 kg as measured under JIS L1096A-1.

Abstract: A modular apparatus for supporting and guiding a tool such as an ultra-high pressure water jet along a work surface, including a contour following assembly attached to a motorized lift vehicle. The contour following assembly includes a gimbals assembly with an instrument or tool carriage assembly, a positioning assembly that urges the gimbals assembly and the instrument carriage against the surface, and, optionally, a hydraulic, mechanical, or pneumatic pressure system that applies pressure to the positioning assembly. A scissors lift, hydraulic lift, telescoping arm, or other suitable device raises and lowers the apparatus. In operation, the gimbals assembly and the positioning assembly cooperate to maintain the instrument carriage in a user-selected position with respect to a work surface such as a ship hull, aircraft fuselage, storage tank, or the like. Depending on the type of tool selected, the apparatus may be used for cleaning or stripping surface coatings, buffing, painting, washing, and so forth.

Abstract: A self-contained floating vessel is configured as a self-propelled or barge-like floating hull. It is equipped with a vacuum exhaust unit configured to pull an air-stream vacuum, by means of pipe and hose lines, from ship cargo holds which contain residual particulate cargo. Primary and secondary collectors are used to separate the particulate cargo from the air-stream. The air-stream with particulate cargo is separated in the first collector by a series of baffles. Approximately ninety-five percent of the residual cargo drops to the bottom of and accumulates within the primary collector, where it is recovered through a dump valve in the collector. The remaining air-stream/particulate cargo mixture is pulled through the secondary collector, which filters and recovers the particulate from the air-stream by means of filters. The cargo particulate is also accumulated in the secondary collector, where it is recovered through a dump valve.

Abstract: A marine fouling prevention system comprises two conductive surfaces and a device that alternates the direction of electric current between the two surfaces. The current is caused to flow through sea water in which the two surfaces are submerged or partially submerged. A monitor measures the current flowing from one of the two conduction surfaces and compares it to the current flowing into the other conduction surface to assure that no leakage of current of substantial quantity exists. The system applies a low magnitude current density, of approximately 0.10 to 0.50 milliamperes per square foot, for an extended duration of time of approximately 10 to 20 minutes. By alternating current direction between the two surfaces, both surfaces can be provided with sufficient chlorine gas bubbles to prevent marine growth from attaching to the surfaces.

Abstract: A water-impervious material forms a protective envelope around the hull of a vessel. Interconnected pipe sections in a tubular opening around the upper edge of the envelope form a rigid frame to maintain the shape of the envelope. A pair of split rods pivotally connected at two points between pipe sections create a front collapsible portion of the envelope. The weight of the pipe sections in the front collapsible portion cause it to sink and pivot downwardly to allow a vessel to enter and exit the envelope. Ropes and blocks between the front portion and the floating piers are used to raise the front collapsible portion and the ropes tied to the vessel to maintain the front portion in place. The remainder of the envelope is fitted with a series of floats so that the envelope encircles the vessel to prevent marine growth on the hull of the vessel. Counterweights on ropes through pier blocks and connected to the envelope around its perimeter maintain it in place around the vessel.

Abstract: A surface is cleaned by a cleaning mechanism resulting in debris. First and second fluid flow paths are provided. The first fluid flow path removes the debris from the area of the cleaning mechanism and the second fluid flow path operates to hold the cleaning mechanism against the surface without debris contamination.

Abstract: In order to be able to dispense with the time-consuming and expensive manual cleaning of ship's hulls (4), a cleaning installation is proposed which consists of at least one cleaning roller (2, 3) which can be driven to rotate, is rotatably mounted in a rack (1) and whose roller structures are positioned at least partially below the surface of the water.

Abstract: An underwater inspection/repair apparatus comprises a sealing device provided around an opening portion of a watertight vessel, a pushing mechanism provided to the watertight vessel, a water discharge pump provided to the watertight vessel for discharging water in an inside of the watertight vessel, and a compressed air supplying device for supplying a compressed air into the inside of the watertight vessel. A top end of the sealing device is pushed against an inner wall surface of the reactor vessel by a reaction force generated when the pushing member of the pushing mechanism is pushed against the reactor internal structure, so that the inside of the watertight vessel can be isolated in a watertight manner. The pneumatic water discharge pump includes a pneumatic pressure cylinder driven by a pneumatic pressure, and a water discharge cylinder cooperated with the pneumatic pressure cylinder.

Abstract: Method and apparatus for reducing or eliminating the contamination by algae or phytoplankton in a fish farm (100). A series of tarpaulins (112) are suspended from buoyant members (103) which support the netting (102) of the farm (100). The tarpaulins (112) are connected at their lowermost ends (115) to a movable series of horizontal booms (122) that may take on air for positive buoyancy or which may displace the air with water for negative buoyancy. The booms (122) reciprocate on generally vertically oriented spars (113) which are maintained in position using anchors (104) and stays (111). As the booms (122) are raised or lowered, the tarpaulins (112) are similarly raised or lowered to allow or prevent algae from entering the farm (100). A water pipe (200) is maintained in position within each cage (101). Air is injected into the water pipe (200) from a compressor (214). The injected air initiates water flow upwardly within the water pipe (200).

Abstract: A boat protection and storage device including a housing dimensioned for receiving a boat therein. The housing is adapted for floating in a body of water. A gate member couples with an open rearward wall of the housing. A buoyant member is secured to the housing.

Abstract: A floating dock is provided for efficiently cleaning ship hulls and for reducing pollution problems associated with the cleaning of ship hulls. A method for cleaning ship hulls with a floating dock also is provided. The floating dock is ballasted and independently manoeuvrable. The floating dock has a ship hull receiving section which can be submerged at least partly so that a base part of the ship hull receiving section may be positioned beneath a ship hull. Cleaners are provided on at least one inner side of the ship hull receiving section to contact a side of the ship hull, and a debris collector may be provided to collect debris removed from the cleaning operation for later processing or dumping at a remote site. The floating dock can be self propelled forward and backward to reach the ship and can be self propelled laterally to clean the ship.

Abstract: An attachment for a conventional swimming pool brush is disclosed, which is designed to continuously urge the bristles into engagement with the side wall of a pool using a novel, immovable hydrofoil. The hydrofoil comprises an upstanding fin having a plurality of flow apertures and is connected to a base portion by a plurality of triangularly shaped support members.

Abstract: A portable, fully self-contained pressure wash-down system operates in a storage mode for storing and hermetically sealing system components when the system is not in use, and works in an operation mode for allowing portable operation of the system. The system includes a container adapted to house the system and a lid connected to the container by a hinge. The lid sealingly engages a top portion of the container to store and protect system components when the system is in a storage mode. The system includes a pump disposed in the container. The pump includes a low pressure inlet for delivering low pressure water to the pump and a high pressure outlet for delivering pressurized water from the pump. The system also includes an intake line having first and second ends, wherein the first end of the intake line receives water from a water source and the second end is connected to the pump inlet. The first end of the intake may contain a filter for excluding harmful debris from the pump or other system components.

Abstract: An anti-fouling protective cover prevents marine growth on inboard/outboard or stern drive marine engines. The cover includes first and second side portions, attached to one another along rear, bottom and front portions. The cover is normally urged open by side-stiffening members and transversely-extending members. The cover is conveniently manoeuvred into place onto a stern drive unit with a standard boat hook, and closed by hook and loop fasteners. The cover is constructed of an opaque flexible material such as bonded polyethylene to reduce the amount of light reaching the engine, thereby inhibiting marine growth.

Abstract: An underwater self-propelled surface-adhering robotically operated vehicle capable of being navigated through a volume of water and of adhering itself to an underwater surface and traversing along the surface. The vehicle has a main body with an interior suction chamber and a motor driven impeller disposed in the chamber to draw water through the bottom end of the chamber and expel it at the top end and thereby create a negative pressure force at the bottom end to maintain the vehicle in contact with the underwater surface. Thrusters on the main body allow the vehicle to be driven through a volume of water before and after attachment to the underwater surface as well as to hold station in mid water for tasks and inspections. The vehicle may be provided with an evacuable enclosure to provide an environment for task accomplishment and with measurement and inspection devices and tools for underwater hull cleaning, welding, and other underwater tasks.

Abstract: A system for removing deposits from an underwater structure comprises a series of interconnected dog members which can be formed into a ring and adjusted angularly relative to one another to conform to the underwater structure. The series of dog members is supported by floats, which allow a preassembled line of dog members to be moved into position and wrapped around an underwater structure. The free ends of the line of dog members are connected together by a pin having a latching spring which can be operated easily underwater. Multiple rings can be used, one above another. An annular net, secured to concentric rings and suspended underneath one or more deposit removal rings, catches dropped deposits. The inner one of the concentric rings can also be used as a deposit removal ring. The dogs can also be disposed in a vertical ring for removal of deposits from a horizontal underwater structure, and a suspended basket is used to catch dropped deposits.

Abstract: A remotely controlled pressurized liquid dispensing mobile unit having a pair of magnetic tracks by which the unit is attracted to and moved along a metallic body to which the pressurized liquid is dispensed.

Abstract: An underwater vane (10) attached to a special support bracket (13) which is clamp-mounted on a standard pool broom pole (24). The vane is bent to form two equal planes (11A & 11B) joined together at a central axis. The axis has pivot holes (19) from which the vane is transversely suspended over the pool broom pole. When the pool broom pole is pushed or pulled through the water, the vane is caused to tip by water pressure until one side and then the other touches the pole. The angle formed between the vane and the pole in either direction of motion causes the deflection of the pole and the attached cleaning device toward a surface being scrubbed.

Abstract: A vehicle or robot movable in the water includes a body having a first opening in its abdomen. A float is provided at the front portion of the body so that the vehicle body suspends in the water with its front portion up. A pressure reducing device is provided in the body for reducing an inner pressure of the body so as to cause the body to suctionally adhere on a wall in the water with its abdomen facing the wall. A sealing skirt is attached along the first opening formed in the abdomen so that it contacts the wall to maintain the body's inner pressure negative as the body adheres on the wall. A drive unit is also provided in the body for moving the body on the wall. The pressure reducing device includes a hose communicated with the body at its one end and a pump connected with the other end of the hose for pulling water out of the body.

Abstract: A vacuum wall walking apparatus includes an annular body frame, a plurality of leg mechanisms extending downward from the body frame, and a plurality of suction cups attached to fore ends of the respective legs. The body frame is composed of a flexible member. The body frame thus constructed is bendable to conform to the profile of a curved surface when the vacuum wall walking apparatus is used with a wall having such curved surface. With this bending or deformation of the body frame, the suction cups are always able to retain an optimum posture to insure that the vacuum wall walking apparatus is stably held on the curved surface of the wall by a vacuum formed in the suction cups. The vacuum wall walking apparatus may include a surface treatment mechanism, in which instance a winch is provided to minimize or substantially eliminate the load exerted from the surface treatment mechanism to the vacuum wall walking apparatus.

Abstract: A method and apparatus for containment of a space adjacent the hull of a ship to protect the environment from polluting materials resulting from the abrasive blasting, spray painting and the like comprising, welding studs having integral connectors to the hull along a direction substantially fore and aft of the ship. Lines are supported and run relative to the studs. Sections of a shroud are connected to the lines and the lines are drawn to pull one end of the shroud sections proximal to the hull and the other end is fixed remote from the hull. Adjacent sections are secured along their sides. The entire space beneath the shroud and adjacent the hull containing the polluting materials is therefore separated from the environment.

Abstract: A marine structure submersible in seawater, such as a hull, which when electrically activated is then resistant to fouling by marine organisms. The hull is formed by a structural laminate having a core sandwiched between inner and outer skins. The outer skin which forms the exposed surface of the hull is coated with a metallic paint defining a cathodic electrode. The core is constituted by balsa wood or foam plastic modules attached to an open-mesh scrim that includes conductive fibers to create an electrical grid defining an anodic electrode that is embedded in the laminate. Impressed across the electrodes is a direct voltage to establish an electric field causing marine organisms which seek to foul the hull surface to migrate away from this surface. Alternatively, the cathodic electrode may be formed by an open-mesh scrim defining an electrical grid interposed between the core and the outer skin.

Abstract: A 0.005-0.020 inch thick thermoplastic sheet containing 20-80 weight percent metal alloy biocide particulate, such as 50 micron copper powder, protects submarine structures from adhesion of flora and fauna. The sheet is isotropic and inelastically deformable in the plane of the sheet. The sheet is heated to form and adhere it to the ship hulls and the like. An intermediate lower melting point film and other aids are employed in the adhering step. Heating of the sheet prior to the adhering process minimizes liberation of environmentally harmful volatiles. The sheet is removable by heating, so the material may be recycled.

Abstract: A debris collection apparatus for use during the cleaning of boat hulls includes a debris collection tray for catching the debris as it is removed from the hull and a pair of wind screens to block the wind and prevent debris from being blown away from the area of the collection tray. Both the collection tray and the wind screens comprise adjustable tubular frames which suspend a flexible sheet within their periphery utilizing alligator type clips. The tubular frames are attached to the boat hull by either magnetic or suction attachment devices through flexible joint assemblies.

Abstract: A marine anti-fouling system and method for inhibiting the growth of marine life on a submerged surface includes a control box and a number of transducers. The control box further includes a ultrasonic driver board, a magna-polar filter, and a power source. The ultrasonic driver board generates an electrical signal having an ultrasonic frequency which continually varies between 25 KHz to 60 KHz. A portion of this continually varying electrical signal is passed through the magna-polar filter where the signal is enhanced. This enhanced signal is then returned to the ultrasonic driver board where it is combined with the electrical signal varying between 25 KHz and 60 KHz. This combined signal is then electrically communicated to a number of transducers which are mounted on the submerged surface to be protected.

Abstract: A carriage movable in waste including: a body having a float at its upper portion and a weight at its lower portion to suspend in the water, the body having an opening in its abdomen; a thrust fan provided on a back of the body, the fan being rotatable in a normal or reverse direction thereby enabling the body to translate in the water and to suctionally attach itself onto a wall or leave the wall; a skirt provided around the opening formed in the abdomen of the body to contact the wall thereby maintaining the bodies interior to a negative pressure as the body suctionally attaches itself onto the wall; and a drive wheel provided on the abdomen of the body to contact the wall upon suctional attachment on the wall. This underwater carriage can move on a vertical wall, have small dimensions and be lightweight.

Abstract: A new Water Jet Powered Boat Bottom Cleaning System for facilitating efficient removal of barnacles and other accumulated debris from the bottom of boats by applying an upward force from a buoyant boule shaped member coupled with the force exerted by a plurality of water jets to an interchangeable scraper blade during reciprocating movement caused by the user against the bottom of the boat. The inventive device includes a telescoping handle member, a hose coupler secured at the lower end of the telescoping handle member and coupling to a water hose, a first water tube secured to the hose coupler opposite of the telescoping handle member, at least one elbow tube member secured to the first water tube opposite of the hose coupler, and a scraping head including an interchangeable scraper blade forced against the bottom side of a boat by a buoyant boule shaped member and a plurality of water jets discharging water from the water hose.

Abstract: The present invention discloses a device for protecting the hull of a water vehicle. The device has a frame having an opened end and a closed end. The frame has a right yoke and a left yoke which are preferably mirror images of one another and attach to one another preferably releasibly proximal to closed end. A sheet attaches to holes placed in the left and right yoke which form a bottom to the device with the right and left yokes being the sides. A tongue can also be provided as well as an anchoring device. Additionally, an extender can be provided to make the closed end broader to accommodate a larger craft.

Abstract: A floating boat washing apparatus including a plurality of floats, at least two pair of rotating scrubbing brushes bearably carried and supported on support frames, a rotating bogie frame on which the support frames of the scrubbing brushes are bearably carried and a frame structure or comparable fixed construction on which the rotating bogie frame is mounted. The rotating bogie frame is mounted by means of support shafts articulated at both ends of a suspension triangle so that the bogie frame is rotatable around the transverse axis of the boat whereby the scrubbing brush pairs are movable in an upright position relative to each other.

Abstract: A method and apparatus for removing coatings from the hull of a ship using a steered magnet vehicle supported by the adhesion force only of a permanent magnet to the surface to be treated. Using an ultra-high pressure water jet system and method for removing coatings, paint, deposits, organic and inorganic from hulls without harming the substrate material and to provide a superior surface for the application of subsequent coatings.

Abstract: A method of preventing overgrowth on surfaces under the water line of vessels and other marine constructions, wherein a fiber flock is applied to at least a portion of the underwater surfaces, said fiber flock being adhered to said surfaces with an adhesive.

Abstract: A device for clearing grilles covering water intake ports on watercraft whereby the grille may be easily cleared while remaining on or in the watercraft. The clearing device comprises at least one scraper that includes a base and a plurality of teeth extending outwardly from the base. A line is attached to the scraper and extends outwardly in opposing directions therefrom. By grasping one end of the line in each hand and looping the clearing device below the hull adjacent the grilles, the user moves the scraper back and forth across the grille so that the teeth grab the grasses and other materials pulling them free.

Abstract: Apparatus for shielding the submerged portion of a moored water vessel, such as a boat hull and driving gear, from direct contact with water. The apparatus protects the hull and driving gear from marine growth, electrolysis, water deterioration of underwater hull fittings and driving gear, fiberglass hull blistering, wood rot, and water leakage. The preferred form of the assembly includes a rigid frame which is secured to support brackets which are attached to a boat dock. This frame is larger than the perimeter of the water vessel hull above the water line. The rear of the frame includes a gate which is attached to the front portion of the frame by horizontal lag bolts. Attached to and dangling below the frame and gate is a water-impervious bag which is larger than the underwater portion of the water vessel. Gate lines which extend from the gate to cleats on the boat dock are lowered, thus lowering the gate to allow the water vessel to enter the bag.

Abstract: For abrasively blast-cleaning the bottom of a ship hull while the ship is supported on blocks on the floor of a drydock, an upwardly facing closed cycle abrasive wheel having a durable but compliant seal projecting forwards around its frontal perimeter, is mounted for transversal movement along the moderately articulatable rails of a mobile carrier. A control panel is provided for effecting traversal, for controlling spraying of abrasive, for controlling X-Y movement of the carrier along the drydock floor, and for extending and retracting rail end support jacks of the carrier frame for locally conforming the vertical positioning of rail ends to the bottom of the ship.

Abstract: Frictional resistance to motion of a boat is reduced by generating an unconfined layer of intermixed air bubbles and water adjacent at least a portion of the hull of the boat including at upcurving side surfaces of the hull. In the preferred form of the invention, an array of spaced apart airflow apertures in the hull extends outward and upward at each side of the keel at a plurality of locations along the hull. Air is forced through the apertures by a compressor or a forward facing air scoop or by a combination of both. In the preferred embodiment, barnacle inhibiting fluid may be released through the array of apertures when the boat is docked or at anchor.

Abstract: The working apparatus comprises a manipulator 1 having three axes, a working unit 10, 20, and a universal coupling 7 for connecting the manipulator 1 and the working unit 10, 20. The working unit 10, 20 has a working portion 12, 22 for rotatably and surface contacting an objective working surface 19, 79. The universal coupling 7 is rotatable about any two axes. The manipulator 401 may be secured to a hatch opening portion 410 of an aircraft by means of a holding jig 406.

Abstract: An underwater servicing device includes a substantially hollow housing (30) having an open face (32) whereby the configuration of the open face (32) substantially conforms to the surface of an article to which the housing (30) is to be mounted. A seal (34) is provided about the peripheral edge of the open face (32), as is a pump (42) in fluid communication with the interior of the housing (30) that is capable of evacuating fluid from therewithin and removing such evacuated fluid externally of the device. A mechanism for moving the device from one location on the article to another is also provided, the mechanism being capable of raising the device away from the article. An adjustable air supplier is provided that is capable of allowing air to enter the interior of the housing (30).

Abstract: The device includes a tubular support which has a contoured section compatible with the curvature of boat hulls, a scrubbing brush on one end of the support and a loop-type tubular handle section on the opposite end of the support. The handle section has a pair of spaced apart, parallel hand-grips. The support and handle section are co-planar.

Abstract: A method of controlling the attachment of organisms to an underwater surface is disclosed. The method comprises contacting the organisms with a compound of Formula I ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are each independently hydrogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, halogen, or hydroxyl. Antifouling coatings and cementitious compositions containing a compound of Formula I are also disclosed.

Abstract: A system for discouraging and inhibiting marine growth onto a boat's underwater hull surface comprising a plurality of sections of foam filled PVC pipe tied together to form a flotation frame, an envelope of flexible, polyethylene, bubble wrap material, of a size and shape to enclose the underwater part of a boat's hull, and affixed to and supported by the flotation frame, a sprinkler hose affixed to the flotation frame for injecting fresh water for washing the boat's underwater hull, and a plurality of drain/check valves mounted in the envelope for eliminating the wash down water in the envelope.