Softener Fx is a synthetic water-softening resin for freshwater aquariums. The ion-exchange resins trade sodium ions for calcium and magnesium ions, softening the water. Soft water is favored by South American and Southeast Asian freshwater fish and plants. Overly hard water also contributes to white mineral crusting around the top of the aquarium. Hard water interferes with many phosphate-based pH buffering products, making it hard to lower the pH. Softening the water eliminates this problem and makes pH buffers more effective. Softener Fx can be regenerated several times with Regen Fx.

Who should use it: Freshwater aquarists keeping soft-water fish and plants will benefit from . The bagged resin makes regeneration easy!