I was asked to repair a Saniflow today. Having read Peter Parry's wonderful article, I was somewhat dismayed.
Made a break for the door, but was cut off. Struggled, but there were 4 of them - so I had no choice. Armed myself with several screwdrivers to poke it with.
Had too remove the toilet cistern to even get the lid off. Problem was it squirted yucky water out of the air intake valve every time it kicked in & wouldn't pump away properly.
Turned out to be two simple problems, one of which was a bugger.
The yucky water squirting was down to a wafty designed air intake valve that was clogged with ooh nasty. Lack of pumping was because a rubber connector wasn't seated properly and had been compressed, so no flow - right PITA, took me around 40 mins to get the piggin thing in straight.
To my surprise it worked perfectly! But what a completely crap design.
Not at all confident though