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How did this turn out? Should have harvested by now.

I've never gotten a good answer for the phenomenon. Small blocks always have a ph stability problem. Once I put plants onto slabs the ph stays pretty level, but they're also getting watered periodically by a drip system rather than by hand. I thought it might be a result of the moisture level...

Roots being "too wet" is only an issue if your water doesn't have enough dissolved oxygen (DWC proves this). What problems are you having exactly?

Perhaps some of the more experienced growers could answer this one: If I have rockwool slabs in dutch trays that drain into a well aerated reservoir (two 6 inch air stones in a 20 gal reservoir), is there any reason why I can't run the drip system continuously as a sort of hybrid between NFT...