"Warning: people of a sensitive disposition might care to venture no
My recently installed Saniflo does not behave as described in the user
manual. On flushing the WC it's supposed to run continuously for about
15 seconds, mine pulses on-off 3 or 4 times for about 2-3 seconds
duration. Any ideas?
Sell the house, failing that give it away, if that doesn't work pay
someone to take it or burn it down. To give you a clue - these ghastly
instruments of the Devil are French. Add the French and lavatorial
engineering - now see why I say get out while you can. Moreover this
particular Frenchman was a lunatic with strong Anglophobic tendencies
and a bad case of corrodible.
I am quite sure the designer was also an ex-submariner Frenchman who
missed the strangled screams of seamen who had got the valve sequence
wrong in the submarines toilet and just been rinsed down with a few
gallons of seawater (and the recently donated contents of the bowl).
They break down at the slightest opportunity. The only thing you can
actually guarantee about them is that they will break down - very
frequently. Basically the only way of maintaining the slightest
semblance of serviceability is to impose on pain of repair the same
rules as for a small yachts sea toilet - if it hasn't passed through you
it doesn't go in the bowl.
They have an interesting design. The motor has poor starting torque and
the macerator lots of tiny teeth. Ergo anything that has strands in it
catches on the teeth and stops the motor from starting. Things with
strands include anything with cotton wool (including cotton wool buds)
and anything with cloth. Females in particular must not be allowed
anywhere near these devices. If you were unfortunate enough to have the
added misery of a sink (oh dear - you were warned) then add hair,
strands from woolly pullovers and almost anything else that's at all
When they break (which they will - that's an absolute certainty) their
endearing characteristic is that you are left with a bowl full of
whatever which you have to empty back the way it came and more
importantly many feet of 40mm pipe still full of minced whatever. When
you disconnect the pipe I'll give you one guess where its going to go.
Repairing or unblocking them is the most thoroughly revolting job.
Now to get to specifics - the pulsing is a fault in either installation
or the pressure switch. Does it pulse with just the cold water tap
running from the sink? The way they work is a low pressure trip switch
switches on the motor when the small holding tank is full. This tank
remains partially full all the time. If its pulsing either the switch
has too low a hysteresis or water isn't getting into it fast enough. The
motor should remain on for a few seconds after everything has emptied so
that pulsing you are seeing shouldn't be happening.
As the failure rate of these diabolical things is worse than that of a
F104 Starfighter I'd suggest you get the installer back (preferably to
remove it forever). If it was installed by yourself then self
flagellation with a few lengths of barbed wire and a call to the Saniflo
people might be in order.
Also, my system is a Sanitop with the outflow from a washbasin going
into the top of the unit. I find that running the tap for a few seconds
activates the Saniflo. Is there any way of adjusting the sensitivity of
it so that it will only run when a reasonable amount of water has gone
into the unit?
To which Peter replied:
No, but if it's oversensitive this might be related to the pulsing you
I don't see why the washbasin water cant just bypass the cutter/pump
Because these horrors are designed to be installed pumping upwards - the
raving idiot who designed them thought it would be pretty neat to have
something you could stick in a downstairs cloakroom and run the pipe
upwards to join the soil stack in the bathroom. If that's how your
installation goes cut out the selling the house bit - just burn it now.
When it fails there is 10ft of pressurised whatsit just waiting for that
final turn on the drainpipe.
The other reason the sink must go through the pump is that the outlet of
the thing is at some pressure. Connect the sink a bit downstream and
every time you pull the chain the contents of the loo make a pretty
little fountain out of the sink plughole (I've seen one plumbed like
that - the owner kept a sandbag in the sink on top of the plug).
Some models have an interesting feature - on the top is a reset switch,
under the top cover is a screwdriver slot on the top of the motor drive
shaft to allow you to clear the (frequent) blockages. However to get the
top cover open to get at the drive shaft to free it - you've guessed -
you have to disconnect the drain pipe.
How they can be called Saniflow when they are anything but sanitary (as
you will soon find out) and rarely flow is beyond me.
As I said - sell the house.