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· Registered
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Probably something wrong with the reference solution. Fleet is quite strong, in my log book I have "1ml of fleet will raise 10gal by 3.4ppm" so your test result sounds right. I use the Seachem test kit and it seems quite accurate, I can narrow it down to +-0.2ppm which is as accurate as I need it to be.

It should be easy to test however, just measure a sample of RO/DI water, then add 1ppm of fleet, and test again.

Giancarlo Podio
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