Ph and airation?

Is there a way to keep ph stable in reservoir while aerating the water? I mix nutes and ph down to 5.8 for coco in 10 gallons and over night my ph has creeped back up to 7.0?

Why are you mixing the night before? Aerate water (if tap water) then mix nutes, PH and feed. You really can’t store for any length of time. Hydro has to be monitored and adjusted as needed.

Will be away from home for 3 days and trying to set up an automatic watering system for my coco girls.

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Just give it 3 days of straight R/O water. You don’t have to PH it and the plants will be just fine for 3 days.