Originally Posted by
SmobyToker#1
That would be either down to the plant using nutes and making the water in pot more concentrated or as crepper says below no ions in the water.
The op has purely a tub with feed in that he gets where he needs it and then fills his res, so the swing is not due to plants, but maybe what creep says is right, god knows man, willing to read about that though, interesting.
I agree with you mate, the smaller the res the more quickly its affected. Hmmmm i might try dwc again....
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