As much as I would love too, I’m only renting an apartment and I don’t think our landlord will allow us to tinker with the plumbing system. I do only 2.5 gallon changes of water a week. However I’ll look into the RO system more. Maybe I can get a big bucket and do some work in the bathroom bathtub or something. On the other hand, I am learning on how to take measurements instead of bringing to the local fish store for $2 to test 5 elements. In addition to the API saltwater test kit I got on the very beginning which I think I’m going to finish before getting maybe a Hanna test kit I also have the salifert calcium and salifert hardness/alkaline test kit that I want to cosume before I get something else.