chem geek Posted January 12, 2013 Report Share Posted January 12, 2013 So you used Spa System Flush originally, then used the tub with chlorine with levels always maintained, then used Spa System Flush again for the next refill and you found a lot of gunk come out? It's probably lotions and oils that chlorine doesn't break down, but that usually would get caught in the filter. If you used the flush with the filter removed (as directed), then it is surprising that you found a lot of gunk. Quote Link to comment Share on other sites More sharing options...
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