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