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hello, i have 2 ph pen testers and i have calibrated them both in the 7.0 and then the 4.0 solution, but when i go to test them both i get a different reading of .3. One will say 5.8 5.9 and other will say 6.1 in my solution, im curious on what im doing wrong and/or the .3,.2 difference will...

I feel like i have a basic understanding on how DWC systems work, Airstones in the water oxygenating the water that the roots sit in. Its just theirs many different ways on how people go about it so i just wanted to know if I was on the right track. For my cab grow I use technaflora nutes and...

Oh sorry I misunderstood you meant good air pump, ok sounds good is there anything else I can do to that would benefit?

If you can explain why I would need a pump because wouldn't the roots just sit in the oxgenated water, what would be the purpuse o pumping water? Sorry just want to ge a good understanding

Hello all this is my first post here and am pretty new to growing. I have a small cab closet grow and was looking into something to allow the plants to get bigger. The grow space is going to be either 4feet x4 x8 or 4x5x8. Should I go with a 600w or 1000w hps/mh system, what wattage of light...