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I've been funneling in some Iron out, cleans my filters right out. Captain Kilowatt's the guy who turned me onto that stuff.(y) Sure it is probably composed of limestone, once in the system I run a little water to get it down the line. Let sit, run it some more, let sit. Just enough to move it along at intervals. Iron oxide drops right out, but have the H2S, sulfur smell like rotten eggs. Day or so all gone. Really works on my softener, some kind of silicate gel stuff. Water here is really hard, above 450 in hardness test.