WC as a dump point

Let me say sorry for this subject matter for any one who is offended.
But when I wanted to empty my cassette WC at a van park, the manager said just use a toilet. Well I did and the 20 litres filled it up and when I pressed the button I over filled the basin and it wasn't pleasant.
So does anyone know the secret way to do this.
I see van park reports where they say no dump point but use the WC.
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