Air purifying apparatus; Filter cartridges for industrial dust collection systems for use in pulse-jet cleaning; Filtering units for water filtering and producing potable water for domestic use; Filters for air conditioning; Filters for drinking water; Filters, heaters and pumps sold in combination for use in swimming pools; Filters, heaters and pumps sold in combination for use in hot tubs; Filters, heaters and pumps sold in combination for use in swimming pools; Plumbing fittings, namely, f...