Thread "Trichlor Tabs" discusses the apparent destructive effects of local concentrations, prompting one to wonder why the Pool Establishment hadn't abandoned the method long ago
trichlor-tabs-t16126.html
In the meantime however I had been made aware of a possible alternative that avoids the problem of these local concentrations, using sodium dichloro-s-triazinetrione called "pool shock" and supplied in powder form which dissolves quickly and completely for a uniform distribution. Athough not specifically designated for the purpose, the recommended weekly dose brings Cl up to about 1 ppm. The make I had acquired, Aqua Chem "Shock Plus" seems to imply a most powerful action but is touted "For all pools, including Vinyl, Plaster, and Fiberglass", and allows you to "Swim in as soon as 15 minutes after use". Sounds too good to be true so comments invited from all quarters
trichlor-tabs-t16126.html
In the meantime however I had been made aware of a possible alternative that avoids the problem of these local concentrations, using sodium dichloro-s-triazinetrione called "pool shock" and supplied in powder form which dissolves quickly and completely for a uniform distribution. Athough not specifically designated for the purpose, the recommended weekly dose brings Cl up to about 1 ppm. The make I had acquired, Aqua Chem "Shock Plus" seems to imply a most powerful action but is touted "For all pools, including Vinyl, Plaster, and Fiberglass", and allows you to "Swim in as soon as 15 minutes after use". Sounds too good to be true so comments invited from all quarters