There is another fun part called the pressure switch. It is a spring and diaphragm contraption that is supposed to recognize enough and not enough vacuum. Maybe a $130 part. I have one of my vacuflush toilets and generator that doesn’t like me and has been toying with me for 2 years now. The pressure switch wouldn’t activate when flushed unless I stomped on the floor above it or tapped the side of it with my finger. so I messed around with adjusting that thumb wheel that changes pressure on the spring to diaphragm. Don’t remember which way did what but once I got it has been ok for months, Just count ur turns each way cause you are describing opposite. It pumps too much before shutting off. After 15 years not so bad to replace all the moving parts. I like that my 35 gallon tank lasts 2 of us 8-9 days between pumpouts because of how little water is needed to flush them.
Eddie and Gail
1987 Sea-ranger 47 RPH

I like that my 35 gallon tank lasts 2 of us 8-9 days between pumpouts
because of how little water is needed to flush them.

As I understand it, the problem with flushing with as little water as
possible is that it allows that stuff that you are flushing to sit in
the hoses, accelerating the buildup deposits. All of the
recommendations that I've seen strongly encourage flushing with enough
water to push all that stuff through to the holding tank, leaving only
water remaining in the hoses. Yea, lots of water, coupled with too
small of a holding tank... decisions, decisions!  Ain't yachting fun!!

Rudy and Jill Sechez
Charleston, SC
BRINEY BUG-a 34' Sail-Assisted Trawler
850-832-7748
Trawler Training & Anchoring Consulting
"ANCHORING-A Ground Tackler's Apprentice"
E-book or Hard Copy

After 30 years of service I replaced all the hoses in my vacuflush system
last year.  I can't speak for the first 20 years, but, I've owned the boat
for 10 years and would say it gets 3 months a year of full time use overall.
We do not flush TP, I feel it's a slippery slope to other things entering
the system (usually by guests) and all the flushable stuff is just too rough
for the admiral.

So... after 30 years, the hoses where looking like suspects for causing me a
bad day, so I scheduled a semi-bad day and replaced all of them.  After 30
years of service, zero build-up in the hoses.  I also noticed very little
residue in the lines from the last flushes I did with just water.  Perhaps a
table spoon or 2 in each hose.  The vacuum pulls everything into the holding
tank and pretty much leaves all the lines clear.

The buildup in hoses IMHO is largely the result of using fresh water
flushing (salt) and urine plus TP and creating what everyone seems to call
"pisscrete".  No salt, no TP no buildup.

TP goes in waste basket
Flush and count to 2 to let water run through
Release the flush lever quickly by slipping foot off of the pedal so it
"slams" back up.
Clear the lines before leaving the boat for a period of time with 2-3
flushes of fresh water.
Brief guests thoroughly and monitor children's use

In regard to the service of the system.  I've got two complete systems on my
boat.  I've changed duck bill valves twice (vacuum not holding), one
pressure switch(no pressure), and both bowl seals (water leaving bowl
between flushes) and one vacuum pump housing (guess flushed something nasty
that ended up wedging itself into the pump and destroying the casing).  All
easy stuff to replace and not very nasty considering what it is.

Systems like these are used in airplanes in commercial use. They're robust
and work well.  Could you imagine having a hand-pump or macerating toilet
on a commercial jet on a transatlantic trip?  It'd be ugly really quick.

So to you non-believers in Vacuflush, and with full respect for Peggy Hall,
enjoy your sand paper toilet paper, finessing the poop with a hand pump and
rebuilding those macerators.. I'll take my vacuflush!

Flame proof suit had been donned. :)

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