Waste from Water softener - fitting help

S

Steven Shepherd

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Hi,
I'm hoping someone can help me with a little fitting help.
I've bought a water softener to fit under the kitchen sink. I've plumbed in the in/out valves, the overflow is going outside, all is well.

Except I can't work out how to connect the waste pipe. Not sure if all water softeners are like this but the tubing is about 12mm (OD) thick (about 9mm ID).

All it says in the instruction manual is that it needs to have an air gap....and suggests something like a standpipe as per washing machines

As it's going under the sink there is space for another waste - currently we have the sink and the dishwasher plumbed in and there is another blanked off screw, but I don't have space to fit a standpipe.

Any ideas?
Thanks
 
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You could dip it into the standpipe used for the washing machine as it will probably fit in beside the WMC waste pipe.

Tony
 
Hi, there isn't a washing machine standpipe - the dishwasher waste goes straight into the under-sink waste via one of those plastic plug things
 
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Huh? The thing in the screwfix link? Where is the air gap?

If the drain gets blocked and he empties a sinkful of dirty water, it will go into the water softener.

See figure 3 in the WRAS doc I linked to above.
 
Could I add a short waste pipe vertical from the sink waste and then put the waste pipe into that, with a small air gap?
 
I've added a picture, the spare one in the middle?

Thanks
 

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You'd need to use something like a HepVo trap to stop water going back up when you empty a full sink for example.


Not sure about the air gap but it does have this in the instructions:

"HepVo acts as a highly effective local air admittance device, removing the need for secondary venting"

Which sounds like it would work.
 
Google tells me that in the US for some reason they are expected to plumb their dishwasher waste pipes in this way with an air gap. I don't know why. Anyway, it seems that they have to bring the pipe above the worktop level (I.e. above the max sink water level) and they have little chrome domes above the worktops that hide the air gap device. See e.g. https://www.plumbingsupply.com/airgap.html

I've never seen anything like that in the UK.

Perhaps you could ask the manufacturers for advice?
 
Thanks all. I'll try the manufacturers and see what they say.

Re. using the Hepvo, I'd still need some kind of strap/joint to attach the tube to the trap...any ideas for that?
 
You seem to have a spare inlet on your waste manifold in the middle.

You would probably get away with fitting an upstand pipe to that and putting the softener waste pipe into it.

Tony
 
Update. Spoke to a guy at the manufacturers. Said I can put it directly into the sink trap via a spare inlet. I still need some kind of method of attaching the pipe though.

He suggested a larger tube would fit the waste trap and to put the smaller waste tube from the softener into that, making sure to seal it with some silicone
 
D

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