Filters, heaters and pumps sold in combination for use in swimming pools; Swimming pool water cleaning and filtering units; Swimming pool drain covers; Swimming pool skimmer flow diverting weir for increasing the amount of debris drawn into the skimmer; Solar-powered heaters for use in swimming pools; Swimming pool chlorinating apparatus; Swimming pool heaters; Installations for heating swimming pools; Swimming pool filters; Plumbing fitting, namely, vacuum release safety valve for flow shuto...