Recommendations on a Macerator?

[mattylad]

Apart from "no don't do it" "move house" and "C4 works better" lol
I'm shortly going to redo our downstairs loo, this has an ancient macerator in (must be 30yr+ old).

Toilet and basin.
32mm (ish) in/out Pipes from the left of the macerator.
Outlet goes up to under first floor, along back bedroom then out back wall to soil pipe, I expect to keep most of this piping and just redo the bottom bits to suit.
It will all be boxed in.

This one looks OK to me, but I don't know how good Flowmasta are?

https://www.screwfix.com/p/flomasta-macerator-wc-bathroom-top-outlet-400w-220-240v/233ch

(Price is right too).

Any better recommendations that are not breaching £350 please?

 

[mattylad]

Is this one OK? Anyone familier with these?

https://www.plumbworld.co.uk/flo-force-ultra-macerator-pump-679-1252357

or this one even?

https://www.plumbworld.co.uk/flo-force-extra-macerator-pump-679-1252356

(getting cheaper)

 

[Hugh Jaleak]

@just pumps is the Authority on these matters, but for what its worth, my personal opinion, Saniflo or Grundfos, along with the old adages, 'You get what you pay for' and Buy Cheap. Buy Twice.'

Note Saniflo offer a 5 Year warranty, the Plumbworld offerings have 12 months and also state "Servicing and cleaning should be carried out once every 6 months. It is recommended that this is done by a qualified professional." I wouldn't be at all surprised if the second half of the Warranty would be voided if you didn't have this done by one of their recommended People.

 

[warey4life]

We used to have a saniflo in our downstairs toilet. Horrendous noisy thing. It sometimes couldn't cope either, especially when certain people were laying big cables if you know what I mean. The outlet pipe split once and sprayed minced up turd and wet bog roll on the toilet wall.
I paid a builder to dig a trench and run a new drain pipe up into the house. Cost me 2k but it was worth it to get rid of that turd mincer!

 

[warey4life]

@just pumps is the Authority on these matters, but for what its worth, my personal opinion, Saniflo or Grundfos, along with the old adages, 'You get what you pay for' and Buy Cheap. Buy Twice.'

Note Saniflo offer a 5 Year warranty, the Plumbworld offerings have 12 months and also state "Servicing and cleaning should be carried out once every 6 months. It is recommended that this is done by a qualified professional." I wouldn't be at all surprised if the second half of the Warranty would be voided if you didn't have this done by one of their recommended People.

I know a plumber who refuses to work on them.

 

[mattylad]

I know a plumber who refuses to work on them.

Do you mean Macerators in general? yes I have heard many say that, this however is my own **** so I have no problem with it.

 

[warey4life]

Do you mean Macerators in general? yes I have heard many say that, this however is my own **** so I have no problem with it.

Yeah that's what I meant. I got rid of my mine because among other reasons, I absolutely hated working on it.

 

[mattylad]

I have already stripped the existing one down, cleaned and repaired it over the past 18 years.

I can manage rubber gloves and a mask

 

[Mottie]

We have a Saniflo slimline in our downstairs loo. They can cope with a wc, basin and shower. Very quiet anyway but I’ve boxed mine in and added some extra sounds insulation and now it practically purrs! I have replaced it once (probably could have repaired it) and with the advice of just pumps on here, repaired the replacement very cheaply. Newest one has been in nearly 20 years.

 

[dilalio]

I know a plumber who refuses to work on them.

I'll fit one new but that's as far as I'll go!

 

[mattylad]

We have a Saniflo slimline in our downstairs loo. They can cope with a wc, basin and shower. Very quiet anyway but I’ve boxed mine in and added some extra sounds insulation and now it practically purrs! I have replaced it once (probably could have repaired it) and with the advice of just pumps on here, repaired the replacement very cheaply. Newest one has been in nearly 20 years.

View attachment 404727

Cheers Mottie, that is almost exactly the look er indoors wants.
Apart from having a hidden cistern.

 

[pete01]

We used to have a saniflo in our downstairs toilet. Horrendous noisy thing. It sometimes couldn't cope either, especially when certain people were laying big cables if you know what I mean. The outlet pipe split once and sprayed minced up turd and wet bog roll on the toilet wall.
I paid a builder to dig a trench and run a new drain pipe up into the house. Cost me 2k but it was worth it to get rid of that turd mincer!

Great explanation

 

[just pumps]

We used to have a saniflo in our downstairs toilet. Horrendous noisy thing. It sometimes couldn't cope either, especially when certain people were laying big cables if you know what I mean. The outlet pipe split once and sprayed minced up turd and wet bog roll on the toilet wall.
I paid a builder to dig a trench and run a new drain pipe up into the house. Cost me 2k but it was worth it to get rid of that turd mincer!

Noisy and blocked easily you say, sounds as if it`s best day`s were behind it as for the outlet pipe splitting, what the hell was it made of!

 

[Daveydub]

I always print this out when asked to fit one:
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?

Peter replied:

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 coprophilia.

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 fibrous.

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.

Angus asked:

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 are seeing.

Angus:

I don't see why the washbasin water cant just bypass the cutter/pump internally.

Peter:

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.

 

[warey4life]

Noisy and blocked easily you say, sounds as if it`s best day`s were behind it as for the outlet pipe splitting, what the hell was it made of!

There one in a building at work which doesn't look that old, and that's noisy.

Outlet pipe was made of some kind of flexible pipe.