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Old 01-31-2009, 11:21 PM
Ron Ron is offline
Senior Member
Join Date: Jan 2009
Posts: 1,285

I am using grow rocks as a medium.
The PPM is a little low around 550 but I am not going to go by PPM. I am going for awhile with how healthy the plants look and what the tomatoes taste like.
No signs of toxic build up yet but I don't think I have been growing long enough with Miracle-Gro to see any.
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