3 ms·Oh, the cistern? those are usually enclosed in the wall here, entirely invisible, without any lid at all.by kuschku 9y agoOh, the cistern? those are usually enclosed in the wall here, entirely invisible, without any lid at all.astura 9y agoThen how do you do toilet maintenance?kuschku 9y agoyou open the wall. You can remove the tiles from the drywall surrounding the cistern.