Rena FilStar Water Softener Pillow

The Water Softener Pillow lowers general hardness (GH) and removes hard water minerals and toxic heavy metals from aquarium water. It provides continuous removal of minerals, such as calcium and magnesium, and heavy metals (such as iron and copper). Providing an aquarium with softer water improves fish health and can prevent unsightly mineral deposits from forming on aquarium surfaces. Water Softener Pillow is designed for use with all FilStar filtration media. FilStar XP1, XP2, XP3 Canister Power Filters.