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Algae Grower
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Is it accurate or should I just toss it out? (The little bottle that came with the drop checker...)
 

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Maybe test it to make sure it's 4 KH? I don't see what would be wrong with it. And "accuracy" is a pretty useless term when describing drop checkers, as far as I've heard. They are just one indicator of CO2 conditions.
 
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