How to use utility for calculation antiscalant chemical for RO membrane

What is an anti-scale chemical and how does it work? 

Anti-scale agent is a pretreatment chemical used in the reverse osmosis water purification process to prevent the RO reverse osmosis membrane from depositing. It plays a very important role in maintaining the quality and longevity of the RO membrane.
Anti-scale agents (also known as scale inhibitors – Antiscalant) are used to minimize the possibility of scale build-up on the surface of the RO membrane. It is widely used to avoid scaling by salts such as silica, iron, barium sulphate, calcium carbonate, gypsum, etc., especially those that cause water hardness.

Instructions for using the utility to calculate the dosage of RO membrane anti-scale chemicals by pictures  

Calculator utility interface:

Antiscalant chemical dosing calculator for RO membrane

Input Data

Feed water flowrate before RO membrane m3/h
Permit water flowrate after RO membrane m3/h
Dose of antiscalant chemical
(Normally from 1-5mg/l based on feed water quality)
Operation time h/day
Chemical mixing cycle Day/time
Chemical storage tank L


Antiscalant chemical consumption per day 0 Kg/day
Antiscalant chemical need to fill in the mixing tank 0 Kg
Recovery of RO system 0 %
Antiscalant chemical concentration after mixed 0 %
Dose of antiscalant chemical after mixed 0 L/h

Step 1: Enter the inlet water flow before passing the RO membrane, the unit is m3/h 

Step 2: Enter permit water flow after RO membrane, unit is m3/h

This index depends a lot on inlet water quality, pretreatment process, RO system design (1 stage or multiple stages, 1 pass or 2 pass). 

Step 3: Enter the dose of anti-scale chemical, in mg/l or ppm. 

Step 4: Enter operating time, unit h/day.

This is the time of the water treatment system operates in 1 day, it can be 6, 10, 15, 20, 24 h/day

Step 5: Enter the cycle for refill chemical, in units of days/times.

This is the cycle time you need to mix chemicals once, for example, if you want to mix once every 10 days, choose 10

Step 6: Enter the volume of chemical mixing tank, unit L..

This is the volume of chemical mixing tank, common will be 100L, 200L, 300L, 500L, 1000L,….
Examples of data entry are in the following table

Antiscalant chemical

On the right is the column that returns the results

  • The amount of chlorine chemicals used in a day is 3kg/day
  • Amount of chemicals to be mixed into the tank: 21kg for each cycle
  • Recovery rate of RO system: 70% (mean 30% discharge to drainage or reuse)
  • Concentration of chemicals after mixing: 4.4%
  • Flow of anti-scale chemical to be filled: 3.57 liters / h, this is the flow you set for the metering pump to fill the water
If you have questions about how to calculate the dose of anti-scale chemicals added to water, please contact our Sales department for more detailed instructions.
Any questions you can contact directly:

Song Phung Environmental Trading Service Co., Ltd

Zalo Business



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