My guess is low magnesium. Before I would track magnesium, I noticed calcium buildup on many of my pump's magnets and shafts. Powerheads .. skimmer pumps .. etc. Calcium precipitates easily when Mg is low. This effect has been profoundly reduced since keepng Mg where it should be. Now I still notice some buildup on the Tunze magnets but nothing that needs to be removed more than say once every 6 months or so.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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