Water Softener Pillow by API $7.19 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity We are currently experiencing temporary outages for select pet products due to vendor shortages out of our control. We may contact you after placing your order to make substitutions or to update you on your order. We apologize for any inconvenience this may cause you. Add to cart Contains resins to remove calcium, magnesium, and soluble heavy metal ions, including copper and iron. Completely rechargeable. Ideal for soft water aquariums. Pillow treats up to 20 u. s. gallons.