Instant Drain Opener. Utilizes efficient air burst technology to quickly clear the toughest clogs and obstructions in drains. For showers, bathtubs, sinks, toilets and exterior decks or yard drains, the Kleer Drain is very effective and environmentally safe - without the risk of harmful or toxic chemicals. Safe for the environment, safe for pipes. Periodic use of the Kleer Drain will help keep your drains clean and clear. Includes (1) 4" reversible cup, (4) CO2 cartridges, (6) power disks and (1) splash guard. Most effective and versitile drain opener on the market.