Do I Need to Vent

[morningcloud]

Hi Guys

I need to fit a new waste trap connection under a bathroom basin, the pipe from the basin has no other pipes joining into it, it simply connects directly into the soil stack, the stack is vented at roof height.

There is a shower waste, bath waste and toilet waste all connected into the same stack, but all on seperate pipe runs into it and they all connect into the stack at a lower level than the basin waste.

The pipe from the basin runs at the correct fall into the stack
A bottle trap is fitted at the moment and the water is very slow going down and I need to replace a click clack plug and Iv'e ended up having to take the bottle out in order to get the click clack fitting out.

On getting the bottle out I found it to be blocked up hence the water being very slow to go down when emptying the basin, so I'm thinking of changing the bottle for a 75mm U type trap.

Question: Which would be the best to go for, unvented or vented, would a vented one help in any way regarding the trap getting blocked up as I live in a hard water area?

Thanks to anyone who can help

 

[snowhead]

A vent won't help.
It's soap, skin and hair that cause the blockages.
A tubular trap is the best way to go, bottles slow the flow down.

 

[exedon2]

I would personally replace it with a Mcalpine anti vac bottle trap but in truth as long as it has correct depth of seal whatever fits best will do.

 

[Ben-gee]

I would use a p-trap with 76mm seal as it’s going to the stack.

No need for vented/anti-vac trap.

Look at various waste fittings, some click clack types have a lot of metal holding the centre section - so much so that there is very little space left for the water to go down and they are more prone to blocking.

 

[morningcloud]

I would use a p-trap with 76mm seal as it’s going to the stack.

No need for vented/anti-vac trap.

Look at various waste fittings, some click clack types have a lot of metal holding the centre section - so much so that there is very little space left for the water to go down and they are more prone to blocking.

Thanks for taking the time to reply guys and yes, I’ll go for a U trap as when I had a good look at the bottle trap I could see it works by the waste water going down inside a tube which obviously doesn’t go right to the bottom of the bottle, the water spills out at the bottom then flows up the outside of the tube until it reaches the bottle outlet.

I could see the tube is acting more like a baffle making the water passage fairly restricted when trying to get out so there was a load of soap and whatever stuck there.

Click clacks are okish but when the rubber seal goes on them and the water starts slowly emptying out of the basin, Iv'e found it a hopeless task trying to find a replacement which will fit even its complete with the chrome button and I don’t think the butterfly type can be removed at all not even to replace the rubber seal or fit a new butterfly, there’s a lot to be said for an old-fashioned plug and chain, at least you don’t have dismantle the basin to replace the plug

I have to admit the click clacks I’ve fitted in my house are unbranded so it doesn’t help when trying to get replacement bits, so thought I'd give this one a try.
Kartell Easy Clean Spruing Plug Basin Waste WAS006, if anyone has tried them perhaps you could let me know if they are any good.

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[Ben-gee]

Exactly what I’m talking about, when that brass stem with two o-rings is in the outer casing there is very little passage for water/soap etc.
At least that one seems easy to lift out to clean.

 

[Alasdair Fleming]

Vado do a plastic bodied universal click clack which is easy to fit without sealant, has less obstruction and much better made than the unbranded ones at screwfix etc