4 Pack Spa in-Filter Mineral Sticks Parts Cartridge Sticks for Hot Tub Spa Swimming Pool Fish Pond Filter Cartridge, Last for 4 Months (Blue & Yellow)

Wanna enjoy the the pleasure of pure natural spa?Wanna keep the algae out of your swimming pool?We sincerely recommend our mineral sticks to you!Features1. Add trace minerals to the water and reduce impurities in the water, thus keeping the water clear2. Made of strong and odorless ABS plastic and the minerals won’t cause any harm to the human 3. Easy to use: put our mineral sticks directly into the spa filters or skimmers, virtually maintenance-free 4. Suitable for spas and hot tubs up to 500 gallons / 2000L and swimming pools, lasting for up to 4 monthsSpecification:Color: Blue & YellowMaterial: ABS PlasticSize: 16″ x 1.25″ After Assembly