Instruction for use of Utility calculator for antiscalant chemical of RO membrane

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

Antiscalant is a pretreatment chemical used in the reverse osmosis water filtration process to prevent the RO reverse osmosis membrane from fouling. It plays a very important role in maintaining the quality and longevity of the RO membrane.

Antiscalant (also known as scale inhibitor – Antiscalant) is used to minimize the possibility of scale buildup on the surface of the RO membrane. It is widely used to prevent scaling by salts such as silica, iron, barium sulfate, calcium carbonate, gypsum, etc., especially those that cause water hardness.

Useful instructions for calculating RO membrane anti-scaling chemical dosage with images

Utility interface:


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

Enter the input value

Step 1: Enter the feed water flow before the RO membrane, the unit is m3/h. For example, enter 10m3/h

Step 2: Enter the filtered water flow after the RO membrane, the unit is m3/h. For example, enter 5m3/h

This index depends greatly on input water quality, pretreatment process, RO system design (1 stage or multiple stages, 1 pass or 2 passes).

Step 3: Enter the dosage of anti-scale chemical, the unit is mg/l or ppm. For example, enter 3mg/l

Step 4: Enter operating time, unit h/day. For example, enter 24 hours/day

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

Step 5: Enter the chemical mixing cycle, units per day/time. For example, if you enter 7 days of mixing chemicals once, enter the number 7

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

Step 6: Enter the volume of the chemical mixing tank, unit L. For example, enter 500

This is the volume of the chemical mixing tank, commonly 100L, 200L, 300L, 500L, 1000L, etc.

Then the result will be as follows:

Antiscalant Chemical Calculator-2
Antiscalant Chemical Calculator

Below is the column that returns the results

Flow rate of anti-scale chemicals to be added: 2.98 liters/h, this is the flow rate you set for the metering pump to fill the water

If you have questions about how to calculate the dosage of anti-scale chemicals added to water, please contact our Company’s Sales department for more detailed instructions.

Popular anti-scale chemicals are provided by Song Phung Company

Original price was: $188,76.Current price is: $184,66.

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