Suggest lab testing in ...

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Suggest lab testing in beakers using various commercially available oxidants, Hydrogen Peroxide, Sodium Hypochlorite, Potassium Permanganate solutions to establish which works best (least colour at lowest dose & lowest cost) then another trial to optimise dose. Alternatively, if the colour is due to coffee grounds, ensure these entering the system are kept to a minimum and in lieu of oxidants, trial various polyacrylomide polymers (cationic, anionic, nonionic, and the variety of low, medium and high molecular weights).