This kit at Amazon *should* work, but we haven't verified that:API Ammonia Test Kit (Salicylate)To avoid losing ground, add 3 gallons, per 10K gallons of pool water, of PLAIN 6% household bleach each evening. Use an OTO kit to test before re-dosing; if you get a DARK yellow value in the evening, skip that dose.
Also, check your pH. If it's below 7.4, add 1 box of borax per 10K gallons of water, each evening as well. Continue till your pH is 7.4 or above. (Add slowly, via the skimmer, with your pump on.)
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