I have used a Maxwaterflow rodi unit and filters for four years. Works great! They have the best prices and you can order other filters from them....... Their rodi units mosly come with first stage as 5 micron, second stage as GAC, and now third stage as carbon block 10 micron, then RO membrane, post GAC carbon, and then DI filter. This will work for you no problem as I have used and am keeping sps and lps and fish. I have however upgraded to their 0.5 micron as first stage and then a 1 micron carbon block filter as my third stage. My setup came with a pressurized tank and ro faucet. Works great! I would recommend to anyone! They also sell all tds meters, float switches, and lots of other stuff with the most competitive prices in Canada. They are located in concord, Ontario and I have been before to pickup filters but with their low and sometimes free shipping it is not worth my trip. From what I could tell they are able to produce good prices because of small overhead.....they are a small company with few employees. This is my two cents....