Our wc gets through washers every 6 months or so. I've even changed the complete ballcock assem. for a "proper" brass one - and still the overflow shows the washer has started to wear again (The ball height is bang on the high-water mark).
Is there some kind of water pressure reduction valve I can put in line with the water feed to the wc?
The pressure seem high (but I've not measured it). I have an isolating value in-line there now - but if I try reducing the pressure by turning it on a little - the noise it makes is awful.