ninfan77 said:I'd say salts accumulating in the water as waste from the plant eating up the nutrients.
Puffin Afatty said:I've seen the ppm rise when I start a new grow, just like you said...hygroton holds some nutes from previous grow and the distilled water leeches them into the res...I used to run a res full of water 1st for a couple hours just to rinse the old salts...
Puffin Afatty said:I use reverse osmosis deionized water, ph stays stable and I add rod water to keep ppm at 900...
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