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Hand watering rockwool

I want to really get the roots going by air-pruning before putting my plant in the DWC, so I'm planning on hand watering with a weak nute solution. What strength shall I use? Do you think quarter strength and pH balanced will be ok? I might do a short test grow doing this and take it up to scrog height then take it down.
 
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What do I need to take into consideration with this method?
 
I didn't know it was called that. :) I'm thinking about doing this part next week. I need to order 3 more T5's first and a few more chemicals. That 'science in hydroponics' site you linked is ace. Learned loads. There's a citric acid-potassium carbonate buffer he came up with that I'm going to implement in my nutes.
 
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