MPH + neutralized balls filter media are all made of natural inorganic mineral materials, which are granulated into ceramic ball. The main ingredients are calcium carbonate, silicon oxide, magnesium oxide and so on. With safety and eco-friendly, long lifetime, high hardness, better effect, etc., can be used as PH adjustment material used in gas boilers, air conditioners and water heaters to neutralize condensate water. Tested by the third party international authority SGS, 19 items fully meet the national drinking water health norms.