RPI-4000A is specially designed to inhibit the scale formation in RO systems operating difficult Brackish water. RPI-4000A displays a high crystal growth threshold value.

RPI-4000A is the ideal reference for water containing carbonate and sulfate salts and/or with high levels of Barium/Strontium salts and/or with high content of metal cations like Iron, Manganese, Copper, Aluminum…


RPI-4000A is approved for use with cellulose acetate and polyamide membranes. The required dosage level ranges from 1 – 10 ppm as delivered. The dosage is proportional to the feed water flow. RPI-4000A can be used as it is or diluted with pure water in any ratio. Diluted preparations must be ideally used rapidly, within 48 hours after preparation. To avoid a storage tank biological fouling, it is recommended to clean from time to time the vessel with a biocide or with a 10% sodium bisulphite solution.
RPI-4000A is easy to use, safe to handle and safe to store for several months.

Physical Properties

Appearance: clear, amber liquid

Density: 1.16 – 1.18 g/cm3

pH value: 4.7 – 5.2

Boiling point / boiling range: 100°C

Freezing Point: -10°C

Solubility in water: unlimited

Storage & Handling

RPI-4000A is safe to use and thus is not classified as a hazardous chemical (GGVE/GGVS, ICOA/IATA). Standard regulations and precautions when dealing with chemical products have to be followed.
The storage temperature should be between +5°C and 35°C. The product is supplied in containers suitable for air, road or sea transportation. Additional information is available inside the safety data sheets.


Polyethylene canister (PE) 23.5 kg net
Standard drum (PE) 240 kg net
IBC Container (PE) 1,100 kg net

Safety Data Sheet


Technical Description