I've encountered a problem with a neighbor's filter system that has granular carbon. Carbon particles get into the water supply and clog the valves in the toilet so it won't shut off. We have to take the valve apart, clean out the carbon particles, and re-assemble it to get the valve functioning properly. Unfortunately, we learned this after replacing toilet valves instead of cleaning them. The old valves were probably fine, just clogged.
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"the difference between genius and stupidity is that genius has its limits."
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