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Phosphotungstic acid (PTA), tungstophosphoric acid (TPA), is a heteropoly acid with the chemical formula H 3P W 12O 40. It normally present as a It binds to fibrin, collagen, and fibres of connective tissues, and replaces the anions of dyes from these materials, selectively decoloring them. — “Phosphotungstic acid - Wikipedia, the free encyclopedia”, en.wikipedia.org
The molecular weight of polyDADMAC is typically in the range of hundreds of thousands of grams per mole, and even up to a million for some products. It is very effective in flocculating, decoloring, killing algae and removing organics such as humus. — “PolyDADMAC - Wikipedia, the free encyclopedia”, en.wikipedia.org