Bestway Floating Chemical Dispenser - 12.7cm Swimmer with water-cleaning dispenser in the pool. The swimmer has regulation of the intensity of dosing cleaning chemistry. This swimmer administers a chemical tablet of 2.5 cm in diameter. It also has a adjustable knob to control the release of chemicals. (Tablets are not included. * Distracts and dissolves 2.5 cm (1) of pool chemistry tablets* Adjustable number dial to control the release of chemicals* Database included tablets* Compact designInset: One chemical dispenser