Hi all, I fitted an en-suite wetroom shower a couple of years ago, and for the last 9 months or so it's not been draining too well. I don't remember there being an issue before.
Initially I thought there could be a blockage so used a solution and an unblocker tool, but that didn't work.
Then I suspected it could be due to pressure, so I removed the trap from the sink in the en-suite so as to allow air to enter the system freely, which worked very well.
So I installed an anti-syphon bottle trap (with air admittance valve) on the sink hoping it would fix the issue, but there doesn't seem to have enough negative pressure to open the valve. If I open the valve manually then the water in the shower drains away within 20 seconds or so. I can't keep the valve open though because then it leaks when using the sink.
Is this a common problem? Have I made a school-boy error on the install somewhere?
I've attached a couple of sketches of what's going on.
Thanks in advance.
Initially I thought there could be a blockage so used a solution and an unblocker tool, but that didn't work.
Then I suspected it could be due to pressure, so I removed the trap from the sink in the en-suite so as to allow air to enter the system freely, which worked very well.
So I installed an anti-syphon bottle trap (with air admittance valve) on the sink hoping it would fix the issue, but there doesn't seem to have enough negative pressure to open the valve. If I open the valve manually then the water in the shower drains away within 20 seconds or so. I can't keep the valve open though because then it leaks when using the sink.
Is this a common problem? Have I made a school-boy error on the install somewhere?
I've attached a couple of sketches of what's going on.
Thanks in advance.