woodsmith
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This may well be salts and lime that have built up in the bend, I've seen toilets with a good 25mm of hard deposit leaving just a small hole to let the water through. These build up over time and if you are eco friendly and don't flush the loo with every pee they build up much quicker.
The build up is hard, in fact very hard, and in my experience you won't remove it with a rod or chemicals. The only way I've found is to take out the fixings, normally two screws in the foot of the pan and two in the cistern and disconnect the water and overflow pipe if you have one,and pull the toilet away from the walll. You will then have to chip away very carefully at the deposit. It's not a nice job, rubber gloves and something disposable on the floor are a must. Oh, and I'd flush the toilet with some bleach a few times before starting.
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