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Very close, according to CocoforCannabis.com. Their information suggests that anything above 300EC (150PPM) is risky. I won't use my tap water which is over 300, maybe over 400, I can't recall. The 300EC figure is not perfect though because the issue is not so much the EC level, but exactly what is causing it. The complications usually come from the source water having nutes (most often Ca and/or Mg, I think) that add to the mix, and potentially knock nute balance out of bounds. Unless you have a detailed water analysis, it is impossible to design your nute additions in a way that effectively incorporates what is already in the water.So I got a EC/TDS meter today. Here's what my water tests showed.
1 RODI from work 3 ppm
2 Rain water (it's pouring collect 10 gal so far) 4 ppm
3 Spring water market 156 ppm
4 Tap sitting over night 265 ppm
5 Tap thru block carbon 270 ppm
So here's a guess for growing in peat moss (promix)......
Rain water great, under 150 ppm ok, 260 ppm and up not so good and possibly cause nutrient issues????
Is that reasonably close to right???
Just my take on the mischief though, @Mañ'O'Green might have more useful comment to add.