Sold by the liter, add additional qty to cart for amount that you need. The scale prevention media is very light, it only takes 3 liters for the standard size unit, 4.5 for the high flow unit. Weight is approx 1.2 pounds per liter. The scale prevention media is the highest quality media for no salt softeners, scale prevention filter systems. TAC Media don’t add or remove anything from the water and don’t change grains of hardness metrics. Unlike salt-softened water, Scale preventive conditioned water maintains the beneficial and essential mineral content of your water and is much better to drink for those on sodium restricted diets. It transforms dissolved minerals in hard water, such as calcium and magnesium, to help prevent lime scale from adhering to metal surfaces in your building’s plumbing infrastructure. The media in the tanks use a specially coated bead resin technology called Template Assisted Crystallization (TAC) to make hard water minerals form micro-crystals that stay suspended in the water. Their attraction to metal surfaces is reduced considerably.