Means for releasing leaves and debris from hand-held swimming po

Method and apparatus for cleaning a purgible swimming pool strai

Method and apparatus for cleaning and filling an aquarium

Method and apparatus for filtering impurities out of fluid

Method and apparatus for optimizing electrolytic production of a

Method and apparatus for preventing algae growth in open-topped

Method and apparatus for recovery of waste water

Method and apparatus for removing contaminants from industrial w

Method and apparatus for removing particulate contaminants...

Method and apparatus for removing resist particles from strippin

Method and apparatus for removing solids from aqueous wash solut

Method and apparatus for water calculation and filtration

Method and apparatus for water circulation, cleaning, and filtra

Method and device for filtering lubricating oil for a dough divi

Method and means for installing a by-pass filter

Method for biological purification of liquids and biological fil

Method of increasing service life of oil and a filter for use th

Method of increasing service life of oil and a filter in an inte

Method of increasing service life of synthetic oil and an appara

Method of initiating a fluid flow within a siphon tube between a