It's was definitely a bad experience, no doubt, But I have a hard time finding the tap water itself at fault. I kept reptiles for ~30 yrs. I had misting systems and all kinds of stuff. The water at that location was so hard that it would clog the mistheads in 30 days. Yeah, that's fast. But those were fine mist heads with tiny openings...and it still took 30 days....give or take a couple. My point is simply that a bong setup is naturally inclined to collect all the garbage from the universe and put it into the loop. They are notorious for that! That's why I added the dual prefilter to my pump...which I have kept since switching over to this chiller. As I said before: I've had to clean these blocks twice--in just over 1 yr. And from actually being here, doing it--it's junk in the loop....not the elements that causes the issue. I am really waiting to see how long it is before they need to be cleaned out again.....with the prefilter--I'm hoping it will be a long time, cuz it's a real PITA!

But, honestly, I wasn't there, so I cannot say for certain, but I willing to bet is was debris and not the water itself.