Yes you right I just started to use RODI system. But I really do not want to. What makes me mad is all that waste water. So what I was asking you guys is do I need RODI water for SPS or DI is enaugh? Still have DI filter. I know there might be other reasons but is this one of the issue for sure. I have a reef 125 with 6 fishes. Light 150w MH and T5s. Amonia, Nitrate, Nitrite-0, Alk.-9 dKH or 3 mq/l. MAG- 1260, Ph-8.2, Cal-460. So for SPS RODI water is a must or DI is good enaugh? Thanks a lot! I use carbon