Hey, same low budget model we have.
Got a tip which I'm sure you don't need, but somebody might.
Ours started showing signs of being blocked (in flushing mode it would fill up much faster than emptying) then on a recent trip it plugged up tight. Nothing was going through.
Rather than launch into the disgusting job of pulling off hoses to clear the obstruction, I decided to have a look under the plywood base the toilet was sitting on...the PO had supported the base on the sides, but the back was resting on the outlet hose which had slowly been forced almost flat
Teased it back into a circular shape, put a hose clamp there to keep it round, and now it works perfectly.
Lesson learned...diagnose toilet problems in an increasing order of complexity and/or disgusting factor.