wc flush

Hi all, I have a push button toilet which flushes weakly. Sometimes it takes 2 flushes to get material down the pipe. The water currently rises to 21.4 cm in the tank. Would anyone have a solution to this? Thanks.

Hi, I am having a new bathroom installed and would like to save space (and avoid building a box) by using one of these: https://www.livinghouse.co.uk/acatalog/super-slim-concealed-cisterns-for-masonry-walls.html The WC will be wall-hung and according to the product spec, only 9cm is needed...

I have just replaced the fill valve in my close-coupled WC and it is now clear I need to replace the flush valve as well. The cistern is just short of 30cm tall to the lip, but the main issue with it is that the hole in the top of the lid that takes the push-button is only 20mm across, and...