[mike31154]

Your city should have water reports available on line. These will list all the good & nasty stuff in there & at what levels. Obviously it is drinkable, but when running a marine system, especially if you're looking at getting some corals & invertebrates such as anemones, RODI is definitely a worthwhile investment. I ran my tank for a couple of years with treated tap water before switching to RODI water. There's no doubt in my mind my tank is looking better every year since using pure water for changes, top up etc. Tap water here in Vernon runs upwards of 210 TDS. That's a lot of extra stuff, mostly not needed or beneficial, going into the tank, live rock, sand, livestock etc.

Being able to produce my own pure water has other benefits. I use RO water for coffee, tea, some cooking, wine making, beer making, mixing with gatorade for sports and so on. My daughter & partner also take advantage & I supply them with a jug full every so often. A month or so ago we were on a boil water notice, but since I had the RO system, I was able to get drinkable water through it without having to boil. Whenever I'm in the store now & watch folks buying cases of water in plastic bottles, I just smile and am thankful I invested a couple hundred bucks in a RODI system 3 years ago. It's more than paid for itself.