Purify water. No more dirty pool. Protect against harmful sun rays. Effectively guard against algae and other organisms. These swimming pool water create a safer, cleaner, and more enjoyable swimming experience. 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 Specifications: Size: 9.5*4.8CM Package Included: 100 x Pool Cleaning Tablets Notes: 1. Manual measuring, please allow 1 ~ 3mm error, thank you. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.