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MimbresValley Reviewed by MimbresValley on . Ph question I just recently switched to hydro, ebb and flow and have a question about ph levels. If i have a barrel of feed and water with a ph of 6.5, can I just add "ph down" to bring the ph down to 5.5 or should I just drain the barrel and start over? I just wanted to make sure because i was told to adjust ph before adding feed. Thank you Josh Rating: 5