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If it becomes more dire you can always buy distilled water which is the same as ro/di water.
About impossible to quiet down mag pumps. Sometimes putting a mouse pad under it will help but they are still LOUDNot sure on the skimmer return, what skimmer do you have? Pics? Did you test to make sure the sump can hold the tanks water when the power is off?
I have a mag 9.5 and it is silent, glued several mouse pads under it. I am using hose instead of pvc though.