Thank you Kien. :wink:

So the only reason to use RODI water is because of the total dissolved solvents and phosphate run off in the spring, if you get that. I was under the assumption that phosphate was a big problem with tap water but I also live in a new home with abs piping.

It's easy enough to test your tap water for phosphate. Then you'll know for sure if it'll be a problem or not :-)

Yes the other junk that is dissolved in tap water will end up in your tank. Whether or not that's actually a bad thing, I don't know :-). There are lots of people who use tap water for their reefs with success.

You're welcome :wink:

Our water is good to me, all I could ask for is a phosphate reactor.