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Runoff water PH is keep going up...

GrayMarket
GrayMarketstarted grow question 14 days ago
COCO medium G.H nuts Runoff water PH is keep going up... 1st I runoff with PH 6.0 / 1 PPM and runoff water came out 6.9 / 160PPM 2nd flush with 5.0 PH came out 7.0 3rd flush with 5.0 PH came out 7.1 4th flush with 5.0 PH came out 7.2 why is it keep going up?? how to solve!??!
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