Softenizer
They are designed for softening hard water. The ion-exchange resin inside the Softenizer is stirred up with the outflowing water from the canister filter system. It effectively lowers the hardness of the water. Three sizes are available according to the size of the aquarium tank and the water quality. The appearance of working resin is beautiful visually and does not disturb aesthetic of the aquascape.
Diameter: 10mm