If you get your water from LFS you might want to check it first with a TDS meter. I bought 10 gals from Wolf reef in the past two weeks. I had an algae bloom and it didn't occur to me to check the water before I put it in the tank. Needless to say the meter read 171ppm. So I called and Alex said he would order new filters and give me replacement water.:lol Lesson learned on my part is to get purified water at walmart. Selling dirty water is not cool IMO.