John, I had Crowns, used them for 10 years but never used the tank or put anything in it. I think it's for liquid cleaner (?) Peggie Hall would know.
As an aside, I have 2 lightly-used Crown motor/ pump assemblies if you ever have a need. They were used 2 summers, and then I converted to Raritan SeaEra fresh water flush toilets.
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Ken on Hatt Trick
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