U-bend water levels

squibs

I've noticed lately that the water level in my loo is about an inch lower than it should be. It drops to this level right after the flush. Any ideas as to the probable underlying cause? Thanks.

loz

check the ballcock in the custern has not poped off ( unlikely you dont know this - else you overflow would let you know ! ) or come loose ( bent upwards ) - this may result in cistern not filling up completely - thus not giving you the adequate amount of water,

also check the plunger in the cistern - is not sticking,

squibs

Loz - don't think that's the issue. It's dumping a full cistern, it just empties too much. It seems like some kind of pressure equalisation thing.

Wobs

Hi Squibs,

I had the exact same problem twice while living in an apartment and on both occasions it was due to the sewage pipes being blocked.

squibs

I was afraid of that
Thanks Wobs

rooferPete

Hi squibs,

If you have three or four 2 gal buckets fill them with water and pour them down the wc real fast, there is a good chance that the soil pipe has a small rise in it and needs the force to move the blockage along.

.

squibs

Thanks rooferpete - I'll give that a go.