Paper2002AD wrote:
I have a blocked toilet - the bowl drains very slowly, suggesting a 90 - 95%
blockage.

Pumping up and down repeatedly with a large plunger has made a big improvement
- estimated blockage now down to 10%

How to clear it completely?

Another possible source of blockage is dental floss. If one piece ever
gets caught up on something, it will continue to tangle up more dental
floss, paper etc... and it never, never rots away. Unfortunately the
blockage can occur way downstream of the bowl, where the plunger, hot
water or chemicals will be ineffective.

One of those extendable rotary plungers might help. They're not intended
to go round the U-bend, but they will with a little care. Also, you
might be able to use it to reach the blockage via the top of the
stink-pipe or the manhole cover near the bottom.

Or if that doesn't work, you'll have to remove the bowl (which is
actually no big deal) and go fishing.

But whatever you find has caused the blockage, make it a house rule not
to do that again.


--
Ian White
Abingdon, England