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

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coco pH won't go down - anyone encountered this?

I fill a smart pot with 3gl of coco, right? right out of the bag. I prepare a 3gl bucket with just RO water in it to wash the new pot. I pH it down to about 4! (shiny red in the liquid tester). Then I flush the pot with the whole 3gl of water. Runoff EC goes down from 1200 to 500. pH - stays 6.5, won't budge a bloody .1!

anyone can tell me anything about it?

I doubt if running another two gl will have any effect...


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