Preparing rockwool.

Discussion in 'Growing Marijuana Indoors' started by Finz1975, Jul 18, 2017.

  1. I have started a little experiment using rock wool and it seems no matter how much or how long I soak or flush the ph doesn't stay between 5.5 to 6.2. Anyone have any ideas what I could be doing wrong? Each time I water I basically flush it and runoff test good but then the next time I water I catch the immediate runoff from the cube and its around 6.5 to 6.7.

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