Urinal deodorizer block

A pink deodorizer block + urinal screen in a urinal at Georgia Southern University
A Johnson Suisse waterless urinal with a block placed above the drain at City University of Hong Kong

Urinal deodorizer blocks (commonly known as urinal cakes, urinal cookies, urinal biscuits (or humorously piscuits), urinal donuts, urinal mints, toilet lollies, trough lollies, hockey pucks, urinal pucks, toilet pucks, lemon bon bons, or urinal peons (alternately urinal pee-ons)) are small disinfectant blocks or tablets that are added to urinals. As these products originally contained para-dichlorobenzene (pDCB), they may also be called para blocks. Besides disinfecting, the purpose of these materials is to deodorize restroom urinals. They are placed above the urinal drain, often in the confines of a small plastic device called a urinal screen that prevents loss down the drain when they dissolve down to a small size.

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