Abstract: A ceramic filter containing at least one functional material and method of manufacturing, a ceramic filter whose surface through which a liquid to be purified flows into is densest and the average particle size of the filter continuously increases toward the interior thereof, a method of manufacturing the ceramic filter including ultrasonic vibration, an extrusion molding die used to manufacture the ceramic filter and an extrusion molding apparatus using the die.

Abstract: The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. The pool water purifying apparatus and system that adopt this method of cleaning porous ceramic filters comprise a filtering means that uses the ceramic filters, a disinfecting means and an adsorbing means and, optionally, an ultrafiltration means as an additional filtering means, and are capable of removing not only bacteria but also viruses so that the water purified by this apparatus and system may be as clean as potable water. Such an extremely high efficiency of water purification achieved by the apparatus and system can be maintained over a prolonged period since both the filtering and adsorption means can be cleaned by backwashing.

Abstract: The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. The pool water purifying apparatus and system that adopt this method of cleaning porous ceramic filters comprise a filtering system that uses the ceramic filters, a disinfecting unit and an adsorbing unit and, optionally, an ultrafiltration unit as an additional filtering unit, and are capable of removing not only bacteria but also viruses so that the water purified by this apparatus and system may be as clean as potable water. Such an extremely high efficiency of water purification achieved by the apparatus and system can be maintained over a prolonged period since both the filtering and adsorption means can be cleaned by backwashing.

Abstract: The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. The pool water purifying apparatus and system that adopt this method of cleaning porous ceramic filters comprise a filtering system that uses the ceramic filters, a disinfecting unit and an adsorbing unit and, optionally, an ultrafiltration unit as an additional filtering unit, and are capable of removing not only bacteria but also viruses so that the water purified by this apparatus and system may be as clean as potable water. Such an extremely high efficiency of water purification achieved by the apparatus and system can be maintained over a prolonged period since both the filtering and adsorption means can be cleaned by backwashing.

Abstract: The liquid purification system of the present invention has a double-tank structure comprising an inner tank and an outer tank that are in communication with one another so that either one of the microfiltration means and the adsorption means may be accommodated is in the inner tank, and the microfiltration means or the adsorption means that is not accommodated in the inner tank may be accommodated in the outer tank, with the disinfection system being provided on the liquid line connecting the inner and the outer tanks. Since the liquid purification system of the present invention has such an arrangement, the system is quite compact in size to facilitate an easy installation and maintenance at low cost while the system satisfies various performances required for the system used for the purification by filtration, disinfection and adsorption of pool water; drinking water and beverages; industrial water; waste water; rain water and water from river, lake or sea; and the like.

Abstract: A liquid purifying porous filter and a filter assembly employing the same can significantly improve filtering performance for impurities in the drinking water, liquors, liquidous seasoning or pool water and can perform back washing while purifying operation is maintained. The filter assembly is small in size, compact and easy to handle, and achieves high performance both in senses of quality and quantity, and is capable of performing back washing while maintaining operation, is compact and is easily installed.

Abstract: The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. The pool water purifying apparatus and system that adopt this method of cleaning porous ceramic filters comprise a filtering means that uses the ceramic filters, a disinfecting means and an adsorbing means and, optionally, an ultrafiltration means as an additional filtering means, and are capable of removing not only bacteria but also viruses so that the water purified by this apparatus and system may be as clean as potable water. Such an extremely high efficiency of water purification achieved by the apparatus and system can be maintained over a prolonged period since both the filtering and adsorption means can be cleaned by backwashing.

Abstract: The method of cleaning porous ceramic filters with a backwashing apparatus comprising an accelerating circulation path and a unit for mixing accelerated water with high-pressure air can be implemented with compact equipment to achieve efficient cleaning. The pool water purifying apparatus and system that adopt this method of cleaning porous ceramic filters comprise a filtering means that uses the ceramic filters, a disinfecting means and an adsorbing means and, optionally, an ultrafiltration means as an additional filtering means, and are capable of removing not only bacteria but also viruses so that the water purified by this apparatus and system may be as clean as potable water. Such an extremely high efficiency of water purification achieved by the apparatus and system can be maintained over a prolonged period since both the filtering and adsorption means can be cleaned by backwashing.

Abstract: The improved golf practicing apparatus has a vertical slider unit that comprises an outer tube, an intermediate tube and an inner tube that are slidably fitted over one another in that order in such a way that the hole in the floor surface can be completely closed with the top surface of the intermediate tube. The apparatus repeats automatically a cycle that consists of automatically supplying a golf ball onto the tee mounted on the inner tube, automatically raising the tee above the floor by a drive mechanism, lowering the tee after hitting the ball on it, placing the next ball on the tee and raising the tee again. The apparatus may be adapted to have the capability of adjusting the height of the tee after it is raised above the floor. It may also be adapted to tilt the floor by a desired angle of inclination.