Our loo has started to play up after ~15 years of use, and it can probably be sorted by simply (?) replacing the syphon unit (pending a full refit probably some time next year)
There are a few shown here, but i`m curious as to the different height syphons they show - would it make any particular difference in a bog- standard plastic cistern ? (no pun intended) - I can`t actually see a manufacurer on it cistern itself, but i`m guessing they`re all pretty much standard units ?!?
Cheers