Clear a blocked flexi-pipe toilet?

[aveatry]

I blame the silly water saving loos or stupid idea of putting a brick in your cistern - maybe if you have a modern plastic sewer system with loverly smooth walls with no cracked salt glaze or roots or dodgy joins but for me I will keep flushing as much water down there as I can thank you.
More eco nonsense - low flush loo that you have to flush twice as the first go failed so you end up using more water than a good flush in the first place.

 

[RrogerD]

I have noticed something similar with ours - an occasional 'big boy' will make the water in the pan rise alarmingly before disappearing with a whoosh - just before it’s about to overflow! I recently fixed a leaking flush valve but the fill valve is cruddy and noisy. My w/c needs completely removing to do anything so later on, I’m going to remove it, fit a new flush and fill valve, replace the flexi pan connector as well as the flexi fill pipe.
View attachment 390854

Yep, ours is the exact same style of loo. And, had to use a flexi as only option of fitting.

 

[Elsa TLC]

Yep, ours is the exact same style of loo. And, had to use a flexi as only option of fitting.

A good plumber with a product knowledge can do these things properly without a flex, in some cases