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Old 02-12-2006, 10:00 PM
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A TDS meter, handheld or inline is essential for anyone who owns an RO/DI system!
It's the only true way to know when your filters are expired
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cheers, Rich

all that we do is touched with ocean,
yet we remain on the shore of what we know
http://www.advancedaquarist.com/2005/5/aquarium
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