I agree with moe. In Nashua, the TDS (total disolved solids) in tap water was in the high 100's. Before I knew better and didn't know about the BRS, I didn't filter it...I just used some chlorine remover and added the salt. I was getting all sorts of algae...cyano, red slime, green and red hair algae...this was on a 46 gallon that was light by 2x96 pcs and it was a new fixture so the bulb age wasn't the issue... I went to inland reef and they hooked me up...miss that store.