The less pure the water used, the more potential algae problem in the future. If your gonna have a FO
with standard lighting, then no, you don't have to use RO
, you will
need to treat the water for chlorine and chloramines before using it. All the nutrients in tap water will more than likely cause some extra clean up time each week scraping the algae. If your gonna do a reef....I wouldn't recommend doing without RO
, unless you have tested your water andd know it to be free of nitrate, silicate, phosphate et...Some tap waters are very good, and do not require any filtration, this is the exception though, not the rule.