Features: 1. Pool effervescent tablet is very practical. It helps prevent algae and increase water clarity. 2. Pool effervescent tablet is effectively. It can reduce the amount of algaecide and flocculant you use. 3. Disinfecting the water, no more dirty pools, creating a safer, cleaner and more enjoyable swimming experience. 4. To prevent chlorine loss from direct sunlight, these products help protect your water from harmful sunlight and stabilize them. 5. Fast, simple and accurate measurement method, very suitable for water analysis in swimming pools and hot tubs. Notice: 1.Actual color may be slightly different from the image due to different monitor and light effect 2.Please allow 1-3cm deviation due to manual measurement Description: Material: Trichloroisocyanuric acid Size: As shown includes: 100pcs x Effervescent Chlorine Tablets