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ok i know the ph can change rapidly in a reservoir. but has anyone ever heard of the ph not moving much when putting in the ph up/down? i have a 10gal resi with a single pump and a single air stone rite where the intake is for the pump. i calibrated my ph meter prior to checking resi...

so i have many different strains and i have soil and aeroponics setups. this problem im facing now is only happening to my soils and its happening anywhere from 2-4 weeks away from harvest. i have em in 3gal pots with a layer of hydroton at the bottom of the pot/under the soil separated by weed...