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# His filters have a limited life you know, I hope he changes them.
(, Sun 10 Jun 2012, 0:51, archived)
# Not if you backflush them occasionally
(, Sun 10 Jun 2012, 0:56, archived)
# How do you backflush a chemical exchange?
(, Sun 10 Jun 2012, 1:05, archived)
# with sick it appears
(depends on what that exchange is - see water softeners)
(, Sun 10 Jun 2012, 1:13, archived)
# Well. poison gas and carbon, usually.
(, Sun 10 Jun 2012, 1:29, archived)