Abstract: A system for circulating water between a container and an external system in such a way as to maintain a desired water level in the container may include, an overflow assembly and a return assembly. The overflow and return assemblies are generally tubular structures, each of which includes a pair of concentric tubes. The overflow assembly typically includes a skimmer and a silent overflow device towards its upper portion, as well as a strainer towards its lower portion, wherein water is taken out of the container through the skimmer and/or the strainer. The return assembly typically comprises an upper capped diffuser and a lower diffuser, wherein the former allows for water to exit into an tipper portion of the container and the latter provides for water inflow at a lower portion of the container. Both assemblies are installed inside the container by attaching to a lower wall of the container.

Abstract: A system for circulating water between a container and an external system in such a way as to maintain a desired water level in the container may include an overflow assembly and a return assembly. The overflow and return assemblies are generally tubular structures, each of which includes a pair of concentric tubes. The overflow assembly typically includes a skimmer and a silent overflow device towards its upper portion, as well as a strainer towards its lower portion, wherein water is taken out of the container through the skimmer and/or the strainer. The return assembly typically comprises an upper capped diffuser and a lower diffuser, wherein the former allows for water to exit into an upper portion of the container and the latter provides for water inflow at a lower portion of the container. Both assemblies are installed inside the container by attaching to a lower wall of the container.

Abstract: The invention is a system and method to allow precise control of the transmit packet rate between two different networks and to optionally introduce a priority servicing scheme across several related output ports of a switch engine. The invention employs flow control circuitry to regulate data packet flow across a local interface within a single device by asserting back-pressure. Specifically, flow control is used to prevent a switch port from transmitting a data packet until a subsequent processing stage is ready to accept a packet via that port. The downstream node only permits transmission of packets from the switch when its buffer is available. An interface block effectively multiplexes together multiple switch ports by maintaining constant back-pressure on all of the ports and then releasing the back-pressure, one port at a time, to see if a port has a packet to transmit.

Abstract: A system for controlling a flow of water out of a container in a manner to prevent the generation of noise as an incident to the outflow and to permit adjustment of the water level in the container, the container being a component of apparatus for maintaining water at a desired level in an enclosure. The system basically includes: an outflow conduit defining an outlet flow path via which water flows downwardly out of the container, the conduit having an upper end located within the container and having an inlet opening; a cap overlying the inlet opening and defining with the conduit upper end an annular flow path via which water flows to the inlet opening; and a vent tube extending vertically downwardly through the cap and into the conduit to establish an air flow path between a region above water in the container and a region within the conduit.

Abstract: A biological filter for treating water in an aquatic system, composed of a porous water absorbing body of material adapted for rotation, and a member for supplying water to the body to be absorbed by a portion of the body so as to cause the body to rotate, wherein the member for supplying water to the body is composed of a receptacle located above the water absorbing body, the receptacle defining a water holding volume having a bottom, and the bottom being provided with at least one opening via which water flows out of the volume and onto the water absorbing body under the force of gravity.

Abstract: An aquatic filter system having a rotatably mounted cylindrical filter body. The cylindrical filter body is formed by a water absorbing mass of material. Water applied to one side of the filter body unbalances the filter body which causes the filter body to rotate. As a result of the rotational movement, at least a portion of the filter body is alternately exposed to the water and the atmosphere to foster the growth of aerobic bacteria on the surfaces of the filter body.