Please help - Macerator exit pipe issue:

[thereus]

I will attempt to describe the situation as tersely as possible

1. The macerator serves a toilet, a shower and a basin.
2. Old Sanipro up worked for ten years then started to run on without emptying. Motor was dead.
3. Exit pipe runs down .5m then horizontally under the floor for 2m and turns 135 degrees before running a further 4m to exit. It is totally innaccessible other than at the ends.
4. Exit pipe is PVC 18mm, no 90 degree bends, but not at a 1 percent slope as specified. Saniflows specify 22mm exit pipes!
5. Have swapped macerator for new Sanibest Pro
6. The pressure of this new macerator is such that it blows the exit pipe out of the macerator when running however well I attach it.
7. I can however blow air or water through the pipe with my mouth
8. I have put a camera through the pipe and the bends are clear, but there is water sitting statically in the pipe and a lot of scale. It is hard to tell if there is a sag in the pipe or if there is a partial blockage collecting water.
9. I have attempted a number of descale attempts using white vinegar with a plug at the end of the pipe overnight. The scale is still there.

So my questions are:

10) Am I getting a syphon effect because of a sagged pipe? Can I do something about that?
11) How can I descale / remove partial blockages in the pipe?
12) Is the Sanibest just too powerful? Should I downgrade?

I hope this is clear enough.

Thanks,

Michael

 

[WC1]

I'm not an expert. I think @rpm
is the man.
Sounds like you have multiple deviations from the manufacturer instructions which, in the case of macerators really need following to the letter.
I would suggest that you have a very careful read of the mi's and then rerun the discharge pipe as per instructions.
If you can replace the unit yourself you should be able to have a go at making up a discharge pipe.
Sanibest is a decent unit, change the discharge pipe not the unit.
I would advise against point 7 by mouth!
Blockages are best sucked back toward the unit with a wet vac.
You can try putting some descaler in the pipe but don't get it into the machine.

 

[rpm]

2 - Motor wasn`t dead if it kept running.
6 - Suspect clip is missing.
10 - No.
11- Same as but with Saniflo descaler and left for longer then rod with a small snake (may have to cut the bulb off).
12 - No

 

[thereus]

2 - Motor wasn`t dead if it kept running.
6 - Suspect clip is missing.
10 - No.
11- Same as but with Saniflo descaler and left for longer then rod with a small snake (may have to cut the bulb off).
12 - No

RPM

Thanks very much for this.

The clip was on tightly. I have tried again. It did not blow off this time but it did leak from the elbow joint and while the motor was running the lid was vibrating a good couple of mm.

Michael

 

[rpm]

Yep they do that. The elbow has to go all the way in not just up to the line and use a 7mm socket not a screwdriver.

 

[thereus]

It was definitely all the way in, but I will give it a try with a wrench rather than a screw driver.

Thanks Again, RPM

 

[thereus]

Hello all,

I should be grateful for some more advice.

I borrowed a long camera and put it along the pipe from the outside. At 4m in, there is a fitting which is pictured. It seems that the descaler has worked best around this joint but that there is more to do before I attempt to reattach the macerator. I have two questions. Firstly, does this look like the partial blockage. Secondly, is this a push-fit connection and if so is it ok to continue using descaler?

Thanks

Michael