khronik I DID bring up the pH thing in my earlier post lol this is what happens when too many geeks are on the same thread.

When it comes right down to nuts and bolts, a soil grower RARELY has to worry about the tap water. Even if your tap water sucks, a lot of the time it's a pH issue and enough humic acid in the soil (the reason you should grow in composted humus if you don't like testing pH) will buffer you in the proper range.
A product called Soil Syrup also does the trick- it's humic acid and also makes a FANTASTIC flushing solution if you get salt buildup in the soil, because aside from being a wonderful buffer, humic acid is also a chelating agent! Yay.