How To Use Progressive Web App aka PWA On 420 Magazine Forum
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Problem with PH perfect and DWC is that PH perfect holds its PH for about a week. Advanced Nutrients for good reason advise you to dump your nutrients after a week and make a new batch. It does not do well when you try to adjust the PH yourself ( it goes up and down at random).
I am using PH perfect myself but Not in DWC I am using it with HPA / high pressure aeroponic's drain to waste.