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Just an observation:
I've noticed with my DWC plants that water is used up faster than nutes, PH doesnt usualy swing that much, but water content (IE TDS) changes heavily when the plants are big.
with this type of system your entire solution will be effected. I bet you will see a steady increase in the TDS of your set up, especialy when the plants get to decent size.
a solution to this would be an outside rezivoir feeding a "controlled" solution into the system.. or just keep an eye on it and do periodic TDS checks...
either way i think this is a cool set up, but it wont do quite what your after IMO.
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I got busted because I didnt have a good filter.
DONT MAKE THE SAME MISTAKE
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