Slow flush from cistern - new toilet

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15 May 2017
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Good evening,

I just installed a new back-to-wall toilet unit with new concealed cistern. Everything works fine, apart from the flush from the cistern into the bowl is slow.

The flush from the bowl into the waste/soil pipe looks normal. The fill value works ok too.

I do not understand how the flush from the cistern can be slow on a new toilet unit. There is very little water coming out of the holes at the front side of the bowl. I checked the holes - they are not blocked.

Any idea why this happens?

* When I fit the flush pipe (the one connects the cistern to the bowl), I remember I cut the length of the pipe so that it goes right to the end of the hole when I push the toilet back to the unit. Do you think this would cause the issue?

Cheers,
Jamie
 
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Not usually, it’s usually a restriction of some sort. Have you checked the flush pipe, and the holes where it connects to?
 
Not usually, it’s usually a restriction of some sort. Have you checked the flush pipe, and the holes where it connects to?

The flush pipe is new. I did not check the holes it connects to (because everything is new...).

The problem is I have already silicone-sealed the toilet with the unit. So before I cut the silicone and make a mess, I want to know exactly what I should check.

I forgot to add that the water level in the tank is also correct - filling only 20mm below the overflow pipe.
 
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The flush pipe is new. I did not check the holes it connects to (because everything is new...).

The problem is I have already silicone-sealed the toilet with the unit. So before I cut the silicone and make a mess, I want to know exactly what I should check.

I forgot to add that the water level in the tank is also correct - filling only 20mm below the overflow pipe.

I’ve had loads of “new” installs, only to find their flush isn’t strong, take apart and voila, tile spacers clogging up the new flush pipe :whistle:
 
Some cones have a stop around the circumference to stop the flush tube going in all the way

I kinda hope mine does not have that, so it will be an easy fix, i.e. cutting the flush pipe, although I need to cut all the silicone off first.... grrr
 

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