You know thats closet grower mentality.
You know why this started? From people letting the medium dry to much and the salt residue is left behind.
um, i have never grown in a closet, thank you very much. Hats off to those that do though. It can't be easy.
In rinsing GH and
Botanicare coco, in my experience, i get an average of 400-900 ppms of something in the run off using RO water (and no it's not my filters, I run the big hydrologic evolution with a DI post filter and test it regularly). there's nothing in my water but Hydrogen and Oxygen.. When I grow in this coco, un-rinsed, i get much more calcium deficiencies and other deficiencies, (mg and K come to mind) than when i run in Canna or Sanctuary un-rinsed.Why not just use the stuff that will save you all that trouble of rinsing and letting it dry out. MY RO filters are damn expensive and I won't waste them rinsing substandard substrate
I learned a long time ago to work smarter, not harder. It's pretty much a no brainer.