Shower trap not letting water away quick enough.

Ynot · 9 Jul 2019 at 23:12

Hi, just wondering if anyone has also come across this problem with the shower trap?

I've this trap fitted and an Aqualisa - Quartz Digital Thermostatic Shower.

https://mcalpineplumbing.com/traps/shower-traps-accessories/st90cp10-70c-90mm-shallow-shower-trap

There is a good bit of pressure with the shower and apparently there is no way of reducing it.
There is a remove able cup inside the trap and when I remove it, the water escapes ok.
The cup is there to stop unwanted smell from soil stack but my shower waste just goes out of the waste pipe straight into the grating.

I was thinking of making the slots in the cup bigger to see if it lets the water away quicker.

Any thoughts.

Thanks.

a1ex2001 · 10 Jul 2019 at 04:46

Take the cup out if there is no risk of pongs coming back up the drain job done or get the correct fast flow waste installed to cope with your shower but probably too late for that now!

Ynot · 10 Jul 2019 at 09:21

a1ex2001 said:
Take the cup out if there is no risk of pongs coming back up the drain job done or get the correct fast flow waste installed to cope with your shower but probably too late for that now!

Yes , too late, I didn't know the shower pressure could not be turned down and never thought the trap could not cope with the amount of water. No, not bad odours. Cup out for now to see if there is a way round it.

Thank you.

sovietspybob · 10 Jul 2019 at 11:27

We have a similar issue with ours, it's fine once you clean it but after the missus has a shower and even the smallest amount of hair gets in to the cup bit it won't flow fast enough.

Ynot · 10 Jul 2019 at 12:14

sovietspybob said:
We have a similar issue with ours, it's fine once you clean it but after the missus has a shower and even the smallest amount of hair gets in to the cup bit it won't flow fast enough.

Do you have the same trap as mine? You would think these traps would be tested better to meet the demand of waste water

...Useless
I'll contact McAlpine, the trap manufactures and hear what they have to say.

Thanks.

a1ex2001 · 10 Jul 2019 at 15:38

Ynot said:
Do you have the same trap as mine? You would think these traps would be tested better to meet the demand of waste water ...Useless
I'll contact McAlpine, the trap manufactures and hear what they have to say.

Thanks.

It is certified for a certain number of litres for minute and there is a good chance your power shower exceeds this, the waste isn't advertised as fast flow.

Entai · 10 Jul 2019 at 17:45

Ynot said:
Hi, just wondering if anyone has also come across this problem with the shower trap?

I've this trap fitted and an Aqualisa - Quartz Digital Thermostatic Shower.

https://mcalpineplumbing.com/traps/shower-traps-accessories/st90cp10-70c-90mm-shallow-shower-trap

There is a good bit of pressure with the shower and apparently there is no way of reducing it.
There is a remove able cup inside the trap and when I remove it, the water escapes ok.
The cup is there to stop unwanted smell from soil stack but my shower waste just goes out of the waste pipe straight into the grating.

I was thinking of making the slots in the cup bigger to see if it lets the water away quicker.

Any thoughts.

Thanks.

Where you say "my shower waste just goes out of the waste pipe straight into the grating."

Can you clarify that a bit more, as at first read it sounds like you are sending your shower waste down a rainwater drain, and not a foul water drain, which is technically illegal.

Ynot · 10 Jul 2019 at 18:08

Entai said:
Where you say "my shower waste just goes out of the waste pipe straight into the grating."

...you are sending your shower waste down a rainwater drain, and not a foul water drain, which is technically illegal.

Yes, we know that, its my wording of it that makes it look like that.

Thanks.

Ynot · 10 Jul 2019 at 18:08

a1ex2001 said:
It is certified for a certain number of litres for minute and there is a good chance your power shower exceeds this, the waste isn't advertised as fast flow.

Ok Thanks I'll check that out.

Ynot · 10 Jul 2019 at 18:11

All sorted, my supplier says he can sort it for me, thanks for all.

Dark88 · 10 Jul 2019 at 18:21

Ynot said:
All sorted, my supplier says he can sort it for me, thanks for all.

What was the suggested fix if you don’t mind me asking? Have the same waste and have removed the cup to increase the flow!

Ynot · 10 Jul 2019 at 19:06

Hi, well, when I say its sorted, its going to be sorted I was told, lets hope

Entai · 10 Jul 2019 at 20:32

Ynot said:
Yes, we know that, its my wording of it that makes it look like that.

Thanks.

No worries, it was purely your use of the word grating, as obviously there will never be a grating on a foul water drain as it would be a source of smell, so the only gratings you will find are on rainwater drains.

The Artfull Bodger · 10 Jul 2019 at 20:51

You can have a trapped gulley connected to foul water - a lot of people's kitchen sinks end up in these and have, what could be considered, a grating.

Burned_Alive · 11 Jul 2019 at 08:16

I suspect that the real issue here is that the trap hasn't been fitted properly and there isn't enough fall on the waste pipe to support the required flow.

Ynot · 11 Jul 2019 at 08:52

Burned_Alive said:
I suspect that the real issue here is that the trap hasn't been fitted properly and there isn't enough fall on the waste pipe to support the required flow.

Hi thanks, I'm no plumber and you would think that but if it wasn't fitted properly you would soon know, a leak for a start and there is enough of a fall in the waste pipe coming from the trap.

Thank you.

Dis86 · 13 Jul 2019 at 09:31

Same trap same issues. Slightest bit of hair and it's useless!

The Artfull Bodger · 13 Jul 2019 at 15:12

Comes down to design by plumber what, as op had pointed out, is a high flow trap is required as without the cup the water flows fine.

Ynot · 13 Jul 2019 at 20:38

I thought of cutting a few extra U shaped slots in the cup but didn't ...yet

The Artfull Bodger · 13 Jul 2019 at 20:45

If its just going out to a trapped gulley i.e discharging over a grating, you'll be fine cutting some slots, the trap will be more for preventing rodents/bugs from coming into the property than smells if that is the case. But without seeing it I can't say for sure