API Water Softener Pillow Aquatic Filter

API water softener pillow is scientifically proven to reduce GH (general hardness) by lowering calcium and magnesium. Also, remove mineral deposits on aquarium surfaces. Water softener Pillow can be reused after it is recharged in a salt solution. Removes calcium, magnesium, and soluble heavy metals from aquarium water. Lowers hardness and softens the water. Do not add harmful ingredients. The convenient pouch is fully rechargeable. For tanks up to 20 gallons. One pillow.