What is the best PH Down brand?
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citric acid 
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I use 85% phosphoric acid whatever brands cheapest usually the hydro shops will have their own bottles
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If ur doing hydro style any kind of pH pro will do good usually the professional kinds hold pH alot better with less fluctuations. Or u can do acids like the boys say. I myself been using bloom city’s pH pro and it seems to work super well for holding pH good
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