In a nutshell: Why the alk lowering process works

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Originally Posted by waterbear

depends on a number of factors. Pools that develop a scum line tend to have more organics (from body oils, suntan lotion, etc.) and might have more of a tendency to foam in very soft water. Not really a major issue. Was just pointing out another reason to keep the water in the pool a bit 'hard'.

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Not to mention keeping your chlorine levels up, too! Chlorine metabolizes that stuff. Can't foam if it isn't there!:D