It will depend on how recent your tray is, Sandy. Modern ones have an insert that is removable for cleaning. You simply prise it out and you should be able to see right into the trap. Then it's easy to clean.
The trap seems very close to the floor of the shower tray and the pipe is under a tiled floor. I've used a plunger a few times but it doesn't fully clear the pipe, just helps it drain away slowly.
It's very annoying. A quick shower now is just that, in and out before the water in the tray overflows.
A liquid drain unblocker is the best way. Anything fierce like caustic soda could damage the seals on the joints . Use the proper stuff. Plenty in B and M etc
Mr Muscle drain unblocker, gloopy stuff comes in a bright orange bottle. Tip half the bottle down and leave overnight before running warm water down the drain. If it still hasn’t completely cleared, tip the other half of the bottle down and repeat.
I’ve just done ours and it works well. If you do it regularly, before any drain gets blocked, it will keep it clear, I always have a couple of bottles of it in.
I unblocked ours through the pipe where it goes into the hopper outside. We have a small screw to open on it just where it changes direction to go into the hopper. Just open it and put a hose pipe in for couple of seconds and it does the trick.
It will depend on how recent your tray is, Sandy. Modern ones have an insert that is removable for cleaning. You simply prise it out and you should be able to see right into the trap. Then it's easy to clean.
Job done. Lifted off the silvered plastic cover and used the lugs on the next section to unscrew it. Loads of matted hair and gunk now in the bin and free flowing water.
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