RPI-6000 is specially designed to inhibit the scale formation in RO-systems equipped with polyamide-, celluloseacetate- and polyethermembranes with anionically charged surface. RPI-6000 is based on stabilized anionic charged phosphonates. RPI-6000 is an excellent inhibitor for calcium sulphate scaling of waters with extremely high sulphate content (up to 15.000 mg/l). RPI-6000 is also effective against calcium carbonate scales. The product prevents effectively the deposition of metal oxides through sequestration.