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A newbe would like to know why my ph drops off two days after a water change I'm using Cogo A&B in a DW system with ro water. starts off 6.3 one or two days its down to 4 or less Thanks for any info.
Just started my first hydro grow so far so good . Wondering how much air flow, Lots or a little? Does the air need to stay on 24/7 or on off with lights ?
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