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Are you running hydro or soil? Higher TDS water can act to slow nute burning/uptake in soil. If your mix is a tad hot you can use some spring water to slow things down a bit. When I ran hydro I used straight tap water, untreated well water basically, and it worked great and never saw a need for RO. I have great water though. For soil I prefer RO as have seen some issues that I feel I can trace to the calcium content that built up over time.
I haven't checked the EC of Crystal Geyser and it's probably fine however I think some issues I've recently experienced are due to using 100% spring water. The water out of my tap basically gets bottled and sold to people like you...:wink:...no kidding. I'm going 100% RO and maybe you should try 50% distilled or RO out of a good machine and 50% Crystal Geyser? I ran hydro and the water was perfect and felt it was not necessary to use any portion of RO. Problem I noticed was when I would pH adjust my tap water the pH would fairly quickly rise due to the calcium content. Part of the problem I was having was the pH would rise in the pots within 24 hours. Seems any dissolved solids in the water were cumulative and over the course of the grow caused some problems. I really think you'll be better off in the long run with distilled/RO or purified water of some sort.
For me, after some experimentation, I went with like 65% OF and 35% Roots Organics hydro mix (mostly coco with perlite). I think next time I'm going 70% OF and 30% Roots Organics.
I use alhambra bottled water we have delivered to our house for drinking.. Our tap has all sorts of crap in it, and the alhambra PH is right at 7, and when i add nutes it drops down to 6.2-6.6 in soil, and my last plants loved the stuff
I found the following information on bottledwaterweb (dot) com (I can't seem to post URLs):
Crystal Geyser Water Company
Water Analysis
*(Mg/l=milligrams per liter)
*(PP/l=pints per liter)
Calcium Ion: 12 PPM
Magnesium: 3.1 PPM
Potassium: 8.7 PPM
Sulfates: 2.6 PPM
Sodium: 130 PPM
Total Dissolved Solids: 590 PPM *(except TDS which are parts per million)
Other Principal Components: Chlorides 260 PPM