when we had someone come out and test ours, it was over 1000 ppm (i don't know much about it, but i know that is really high).we've also got a lot of iron in our water.... turns everything orange within a couple weeks, even with adding shit to lower the iron levels. the ph wasn't too bad though, i think it was around 7. I'm using a hydro system though, so I don't want to be adding anything into the rez, and not know it. so thats why I stick with the distilled.