Watermom, I posted while markcobra's post was still in mod queue.
markcobra, While the FAS-DPD test can be bleached out, it is far less likely than DPD or strips. Also if you put two scoops of powder in the the 10ml sample and swirl it you will porbably see a flash of pink before it bleaches out a third may turn it pink. No flash, no pink, no chlorine. No chlorine, go after it with bleach adding 6 gallons 6%, let it mix and then test - you should start seeing CC if you're fighting ammonia.
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