You could have the same kind of build-up in the hose that runs from toilet outlet to holding tank inlet.
If it's uric acid crystals (yes, could happen with freshwater), Sew Clean by Trac will dissolve that, easily. (I think Raritan still sells the same stuff as "CH" under their own label.) If you happen to have Barnacle Buster on hand, you can use that instead, diluting to Sew Clean ratio instead of the BB proportions.
-Chris
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Chesapeake Bay, USA
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