:doh: I bet they have a few.
I've read this thread and am now some clearer about ppm. I think I'm becoming a cannabinerd.
Keep plugging along Pappy, this is a lifetime learning hobby, and your doing just fine.
I never even gave that question a thought, I just change the res when i feel like it(time wise)but always no more then a week
Yeah in hydro, the plants are used to having the water environment so water change timing isn't an issue. I usually do it during the dark period as I don't water them during that time. That is the longest stretch of time so that I can be certain I get the pH adjusted and the solution fully mixed before they get watered.
The longer "water roots" will hang in the water of the DWC type hydros, but the pH isn't as critical for them as they really only draw water. But the feeding roots that stay closer to the root ball need to have the pH correct before it hits the medium so that the medium doesn't get pulled out of range.
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