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Yes that is tap water and I am planning to use that water just to check for leaks and rinse the tanks since it is a used one and I had it previously filled with water and vinegar. The check valve are there because I feed my chiller and dump the water back on the main line instead of dumping into sump and loosing head pressure. I was suggested that those clear valves had some horror stories of cracking up. The reason why I got them clear was that I wanted to see if the water was getting returned backed on the inline and not get in a stale closed loop. So I think I will have to redo some of my plumbing and put regual pvc ball check valve since I know now that water flows through and hopefully will squize in either my skimmer or my calcium reactor if a rearrange my sump.
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