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  1. M

    DIY PH Down from Sulfuric Acid. (Battery Acid)

    I hate bumping up old threads but I'd like to stick a nail into all the sulfuric acid haters... General Hydroponics (the guys that make ph up/down) says... As of right now the page can be found here: http://generalhydroponics.com/site/index.php/resources/faqs/ph_dynamics_and_adjustment/ I've...
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