What is the PH of your tap water
(after you let it sit several hours?) Compare that PH reading to your
tank
PH and you should see a difference.

DJay



I use RO/DI water and the pH of that is pretty low. The test kit reads 6.0
but I have a hard time beleiving it.
I guess all I can really go on is KH which that test kit is at work. I'll
have to get another one...

~Mort