| http://www.w3.org/ns/prov#value | - As the cell fouls with calcium, you will need to run it longer to get the same amount of chlorine, so it will foul even more, so you will need to run it even longer.....A Taylor FAS-DPD chlorine test kit is considered the best by many people, as you can test up to 25ppm at 0.2 ppm resolution quickly, accurately and repeatedly using titration, which involves noting a change from a pink color to col
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