I was told never use tap water

PPM post filters are about the same as straight tap.

Gotcha.

Under 300ppm is probably fine for soil, but you’re right on the edge. For soilless like coco/perlite you’d probably want to be closer to 150ppm, but soil is more forgiving. I can’t speak from experience though, as I’m super fortunate to have very soft tap water.
 
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I've used tap water straight from the faucet for all my grows. It sits for maybe 5 minutes while I mix in nutes and carry it to the basement. That's it.

No issues thus far on any of my grows. Sometimes we over think things.
That’s what I thaight then 3 grows in organic the high tds is ca and had a liming effect rose my ph to 7.7 and damaged all plants with heavy mg def
Ro filter for sure if u got a soil test if shiturself how lucky ya been
Citric acid turns the ca back to co2 and off the water but go tap almost kill so many grows peeps think they have deficiency’s at times when it’s the water google tap water liming effect and I’ll see how many universities have published it nevermind the company’s lol
 
i live in a European city, I use tap water with no messing, no ph/acid/ chemicals, i add my nutes to the bottle and fill direct from the tap and then water the plant/s straight away.

I guess if i bought lots of little gadgets and measured everything before, during and after, I might spot some issues, but I do like to K.I.S.S
 
I lived in a major US city and there is another factor to consider here in the USA, and that is fluoride toxicity with city water. It is far more of an issue than chlorine can be! Now that I live in a rural community(I am the licensed water system operator) I do have access to a complete breakdown of what is in our water, and we do not use chloramine, just simple 12% chlorine and we nixed the fluoridation scheme "suggested" by the state. I source my water for my grows directly from the spring that feeds our reservoir before any treatment, tds of 50 and a Ph of 7.2 fairly continuiosly.

Ps: I just checked and I had a Ph of 7.19 and a TDS of 30
 
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Straight tap from a well was great until flowering, then it almost destroyed my first grow....high calcium from a limestone aquifer.....store bought RO and only 1/3 from well got me to the end.....Now it's RO period and not many problems since. So I'd say it all depends on what is in your tap water
 
Call your town hall or city hall if you want to know what's in your water (trust me, they will know.)

Our municipality is literally water pumped out of the ground with chlorine added. No filtration, no other chemicals. It's over 500 ppm from the tap (very high manganese) and has pH of over 8.0 Not every city/town treats their water the same, and some treatments are vastly different depending on what's in the source water.

Oh boy! We're at 800ppm before my RO system treats it with 180+ grain. We get algae blooms in our toilets that can kill animals and make people get sick. When I first started growing here the water was at 180ppm them a few years later it remained over 500. pH stays over 8.8.

@SHRED I'd use that RO system because should an issue arise, you can normally rule out your water as a problem. I was able to make it to mid flower on 500ppms but would lose all my leaves within two weeks. If I ever have issues now it is not because of my water with the RO system.
 
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