Just looking at the tomatoes on the cover of that seed catalog is making my mouth water! I envy you being able to grow tomatoes, or anything else, for that matter. Unfortunately, the water here is so bad that it makes anything watered with it taste absolutely horrid, including tomatoes and strawberries (the two main things I've always wanted to grow). :-/ I use a Royal Doulton gravity filter for my drinking water and shower filters, but I don't know of anything that would work for the garden hose.