Coral reefs are considered nutrient deserts and corals, anemones, and many other reef inhabitants have evolved to thrive in these conditions. Tap water has dissolved solids of all kinds within it. Much of these dissolved solids are not found on coral reefs and can cause problems for reef inhabitants either directly, or indirectly. In a closed system like our aquariums, we get evaporation that needs to be replaced. This means that all that bad dissolved solids stay behind while we add more with the tap water replacement. This can cause all kinds of long term issues and some people do not see these issues right away, but as these bad dissolved solids build up, things start to go wrong. At this point, it will cost more time and money to fix, then it would have cost you to buy an RO unit. With RO or DI water, you have 0 desolated solids, or close to it. When mixed with a good sea salt all of the proper dissolved solids are replaced without any of the bad stuff. I think using clean water is the single most important thing in reef keeping hands down... If your water is dirty from the start, you will never succeed long term.
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