To maintain optimal performance the Zodiac Nature2 Express Express Replacement Cartridge should be replaced with a new cartridge every 6 months. Product Number W26001.
Replacing is simple, just unscrew the lid to remove the old cartridge and replace with a new Zodiac Nature2 Express Replacement Cartridge.
Features:
Automatically disperses silver and copper ions that maintain water quality.
Maintains a stronger, healthier pH balance in your pool.