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BobFord said..
In case this is any use to you HG, I gave up on manual toilets years ago . Have used several TMC electric loos. With the correct cleaning every few months, that is acid , white vinegar , veggie oil. Never had a failure. By the way , I sourced the treatment that I now use ,on this site. Whoever blogged it - spot on mate !
Actually later on I was going to retro fit a electric part of the Lavac as it just in series with the manual
Maybe just buy a electric Jabsoc or TMC