Treatment of water of swimming-pools and baths – Part 2: Combination of process: Adsorption, flocculation, filtration, chlorination
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/1997

Treatment of water of swimming pools and baths – Part 2: Combinations of process with fixed bed filters and precoat filters
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2012