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Hydroponics CANNA ADDITIVES PK 13/14 Plant Nutrients 5L Litre

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pH constantly at 3.5

Hi. So this morning I checked my pH of my water, and it was 3.5. I noticed that the leaves started turning yellow (my plants are a week old and a bit. Their roots havent left the pot yet). I put in some pH up, and it didn't work. All in all, I put a total of 50ml of pH up today, and it doesn't work. It used to work to control pH, but now it doesn't. Anything I can do? There is a tiny bit of algae on the rockwool, but that's managable and I am putting h2o2 now. I doubt it's that. I have a DWC...

pH constantly at 3.5

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