So add this to my tap water & no need to worry
It’s what I’ve been told and from my experience, 100% good. Again, I don’t rely on tap water and just keep some of concentrated VItamin C to drop in tap in case I can’t use RO at the time.
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Dolomite has calcium, calcium is an absorbic acid… same thing. No need to by more junk.
I live in a city built on limestone lol wonder if limestone is already in my tap water
My water definitely has calcium in it, make 3 pots of tea & ill need some vinegar to clean off the deposits.
Check your hot water heater,…
Heck, check your toilet bowl lol…
Wait 
what I’m I doing in here?
I think you were going to pass out some free beans
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Me? I’m so confused 
Stading in front of toilet with a cup, waiting instructions from the internet 
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Doesnt take much eh?
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Maybe it’s from all the limestone in my water, probably have calcium deposits on my brain.
BRB gotta garggle some vinegar 
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FWIW, in a properly working RO system, the RO permeate will have exceedingly low salt content (and EC). In essence, it’s pure water. No salts … along with the removal of many other impurities.
The RO rejection will contain any salts that were removed from the permeate.
If you see high EC in the permeate, something broke. The membrane is damaged. for instance.
Pure water, being solvent, will leach minerals at a higher rate than tap, for instance, from anything that happens to be soluble in water. This may explain seeing an increase in mineral deposits when using RO. Though, I’d expect the salt content of tap versus RO to end-up looking similar once passing through the substrate … but I really don’t know. Interesting experience, I’ll need to keep on eye out for that.
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I think they may have been thinking of a water softener and not RO. A standard softener will load your water with sodium.
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I have been using city tap to grow mushrooms successfully, both in making my culture as well as just hydrating the fruiting blocks straight with cold tap out of the faucet.
This is what convinced me that we can probably maintain soil health with tap, at least in my city. If I can grow mushrooms with tap, my thinking goes that I can cultivate a fungally dominant living soil with it as well. It assuredly will be different than RO or rain, but different != Bad.
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This sounds right, though.
Really didn’t mean to suggest otherwise; but all the same - great stuff.
Thanks for putting it up here for us, too!
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I have been using rain water on my current grow and it seems to be doing fine…the ppm’s in my rainwater are 33-45.
I use tap. PH runs between 7.3 - 7.8 here about. I generally ph to 5.9-6.3 range. I do let it sit for >48-hours to outgas, but had no idea about “chloramine vs. chlorine.” I’ll have to do some research on what my local utility uses.
Update: definitely uses chloramine. So much for outgassing! Saves time I guess. I’ll use distilled for mycobacterium supplements going forward.
If you’re in a medium-sized or larger city, the odds are good they use chloramine. The larger the water distribution network, and the further from the processing facilities the customers are, the more likely it is that chloramine is used because of its longer halflife compared to chlorine.
My city water uses chloramine and I grow monster organic veggies with straight hose-water outside in raised beds and large plastic pots. This might be the year I run a side-by-side to see if there’s a difference using my RO unit, but from what I can tell it doesn’t prevent me from being successful (outside) at least.
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