A few weeks ago our shower started to occasionally drain slowly. As it got worse, I thought I’d have to get out the snake or call a plumber. Then the other day I thought ‘why not just try the plunger?’
30 seconds of plunging, and I suddenly felt the blockage break loose, and the 8cm of standing water drained immediately.
Gotta love simple fixes that work.
Check the outside drain into which that pipe exits if there is one. The hair and gunge may well now be partially blocking it. Ours backed up under heavy rain quite frequently until I installed chicken wire an inch above the grid down there