Reef tank help

I bought my RO/DI from filtersdirect. Cost $100. and I have never been happier with it's performance. I change my filters every 6 months like clockwork. It is one of the most important pieces of equipment you can own. Sace yourself all the headaches and get one asap.
 
Also smaller units are more efficient than larger ones.(GPD) I am currently using a 100GPD unit and thought it is very good the 35GPD unit I replaced it with was better purifying the water.
 
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