RO Low Silica Antiscalant is a type of chemical which is added to the water before it passes through a reverse osmosis membrane system. This is a water pretreatment additive for reverse osmosis systems that is very successful in preventing membrane scaling. It's made to reduce scaling and inorganic pollution by pre-treating raw water. RO Low Silica Antiscalant prevent scale from forming on the outer membrane of a water filtration appliance and prevent corrosion. This chemical is very cost effective to use.