7 Equipment used for the treatment of boiler water, namely, reverse osmosis, filtration and ultra filtration equipment in the nature of filters, namely, membrane filters, media filters, mechanical screen filters, cartridge filters, electrostatic filters, bag filters, and cloth filters; Equipment used for the treatment of open re-circulating cooling systems, namely, oxidative chemical generation equipment in the nature of generators, namely, chlorine dioxide generators and ozone generators; Equipment used for the treatment of closed re-circulating cooling water systems, namely, oxidative chemical generation equipment in the nature of generators, namely, chlorine dioxide generators and ozone generators; Equipment used for the treatment of closed re-circulating hot water systems, namely, oxidative chemical generation equipment in the nature of generators, namely, chlorine dioxide generators and ozone generators; Equipment used for the treatment of wastewater effluent, namely, oxidative chemical generation equipment in the nature of generators, namely, chlorine dioxide generators and ozone generators; Equipment used for treatment of potable water, namely, oxidative chemical generation equipment in the nature of generators, namely, chlorine dioxide generators and ozone generators