I don't care to buy my water from a LFS as you can never trust how good/bad their filters are. I bought a RODI unit about five years ago and it has paid for its self over and over. I'm sure the Edwards Aquifer water is good stuff but nothing is better for your fish and coral than RO and better yet RODI. Plus like I said I tested the "RO" water from the store and it has a TDS reading of 10ppm. This tells me the Edwards Aquifer water isn't that great for my tank.