Open the operating plate, place the block, close the plate. It is that easy to guarantee hygienic freshness with the toilet block holder for concealed cistern. The toilet block holder can even be retrofitted. It carries the cistern block via a slide to a fixed position below the water surface in the reservoir. Once there, it slowly dissolves, ensuring hygiene and freshness with every flush throughout the entire WC. The optional toilet block holder is compatible with the Geberit Sigma01, Sigma10, Sigma20, and Sigma50 flush plates.