Charmm Toilet Block Blue:Provides continuous cleaning.Detergent foam cleans and freshens.Cleans with blue action.Easy & safe to use in septic tanks.Safe to use with other toilet cleaners.Lasts approximately one month.Brand : CharmmCategory Type : Toilet CleanersProduct Form : TabletsSize : 560 gmPackaging : PouchAre batteries needed to power the product or is this product a battery : NoIs this a Dangerous Good or a Hazardous Material, Substance or Waste that is regulated for transportation, storage, and/or disposal? : NoExpirable : Yes