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A week could be possible so long as pH was properly buffered and everything was set on timers to keep the environment stable. Usually, I check pH and have to adjust every few days or so with DWC bubble buckets which are in a way very similar to Waterfarms. Also, make sure you have enough solution in your res to last well over a week. I like the lucas formula for nutes with RO water; pH seems to stabilize quickly with little or no problems. Good Luck
Dr. T
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