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I finished the water test and it became visually apparent as to why we need RO/DI. The water was never clear straight from the tap, and left a visible scum line in the tank and sump. Almost a soapy consistency from only about a week of having water in place. Now I managed to remove most of it with a hot water and vinegar solution, but there are a few place where there is still some build up. Does anyone having suggestions for anything more effective, but safe alternatives? Thanks.