Pool Protector Multi 5-1 Tablets is a disposable floating chlorine feeder. It kills algae, controls bacteria, clarifies water and lowers pH. It is easy to use, without the need to handle the chlorine tablets. Set and forget and lasts for one month in an average sized pool. It can be used as a winteriser in Winter. The plastic canister can be recycled. *DG 5.1 - DANGEROUS GOOD FEE APPLIES*