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Unread 09/18/2021, 10:30 PM   #6
SantaMonica
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Join Date: Feb 2007
Location: Santa Monica, California, USA
Posts: 2,511
Do what swimming pools do... low levels of chlorine. Maybe get a hot tub water testing kit.


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Inventor of the easy-to-DIY upflow scrubber, and also the waterfall scrubber that everyone loves to build:
http://www.reefcentral.com/forums/showthread.php?t=1424843
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