planealternative wrote:
My guess is that being pneumatic, they work on trapping air in the tube sort of like pushing an upside down cup into a bucket of water. The higher the fluid level on the outside of the tube, the greater the pressure inside. If this is the case (and again I'm guessing), there shouldn't be any fluids or solids entering the tube to clog it up.
That would depend on where the diaphragm is located. If it's at the bottom of the column it'd be less likely to gum up. But if it has any sort of hollow tube rising up into the column it will VERY likely get gummed up. The macerator between the toilet and the tank grinds things up relatively well. Enough that turns the paper into wispy sorts of threads. Those tended to get up inside the column in the old Xintex sensor. When you pump out the tank never gets entirely empty. This leaves a chance for those tiny shreds of paper to get up inside that column. Then, as the waste level rises and sloshes around in the waves, the bits get worked up higher into the tube. When you pump out they sometimes stay stuck inside the column, where they dry and harden once the level drops again.
If you're just holding a drinking glass into some water the level inside it will not rise. But if you start sloshing the water and glass around there's a chance that the level inside the glass will rise. Were it just staying still I agree it'd work great. But the movement makes for problems. With float sensors at least you're getting the sloshing action working to keep the gunk moving off the floats. Or that they'll be likely to loosen up when the level rises again.
Anyway, I've had to replace a tank sender fitting so I'm more familiar than I EVER WANTED TO BE with waste tank issues. I'm still having a devil of a time with waste water getting up into the vent line and then blocking it from working properly.
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I seriously don't know if they are pneumatic or float, but I'd guess float.
