Feature:1.Reduce the amount of algaecide and flocculant you use.2.Protect against chlorine loss in direct sunlight while stabilizing them, reduces the amount of chemicals you need to add. Use 7 tablets per 2,500 gallons of water per week to achieve crystal clear pool water 3.The pool effervescent tablet helps prevent algae and increases the clarity of water.4.Environmental protection. No harm to the environment and aquatic life, safe use.Specification:Type:Pool Cleaning TabletNet content: 50/100gMaterial: TabletColor: WhiteSizeas showShelf life:36monthsPackage Included:1 Bottle x Pool Effervescent Tablet or 1*drug dispenser(see picture for details)Note:1. Due to the light and screen difference, the item's color may be slightly different from the pictures.2. Please allow 1-2 cm differences due to manual measurement.