Quick question: I have some liquid chlorine that says "12.5% sodium hydrochlorate, 87.5% other ingredients, and 15% available chlorine". As far as the pool calculator, is this 12.5% or 15%?
Use 12.5%. Their calculation of Available Chlorine has to be wrong, but odds are they aren't at 15% strength. If you find you are getting a higher FC than you expected, then you can always use 15%.
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