Chemical Dosing System

Chemical dosing systems are used to automatically inject chemicals into chemical feed tanks for water wastewater treatment. During the dosing process, chemicals are added to the water stream at a precisely controlled rate by dosing pumps.

KUOSI chemical metering systems offer pre-engineered and fully customizable water treatment equipment. They can be used effectively in industrial and municipal water treatment processes. For example when used to disinfect drinking water or as part of a chemical scrubber system. Compact and lightweight pre-packaged skids, corrosion resistance, flexibility of metering pump options and ease of maintenance are some of the advantages of our chemical feed systems. Water treatment applications include disinfection, fluoride treatment, sulfuric acid dosing, sodium hypochlorite systems, dispersant polymer dosing, sodium hydroxide feeding, potassium permanganate dosing, coagulation and flocculation, hydrochloric acid dosing, alum feeding, ph neutralization and scale inhibitor addition.

How does chemical dosing system work?

The chemical dosing device is assembled on a public platform with metering pump as the main dosing equipment, dissolution tank, agitator, liquid level meter, safety valve, check valve, pressure gauge, filter, buffer, pipeline, valve, base, escalator, automatic monitoring system, electric control system, etc. according to the process needs, forming a module, which is called skid-mounted combined unit.

It adopts the form of electromechanical integration structure, and can be divided into fixed and mobile (trolley type) from the installation, and each form of dosing unit is equipped with mixing system, dosing system and automatic control system. Several fixed skid-mounted units can be combined into a whole, together with frequency control system, which can realize local control, remote automatic control, manual and automatic interchangeable dosing.

Standard chemical dosing system engineering drawing
Standard chemical dosing system engineering drawing

KUOSI is a manufacturer and supplier of chemical dosing systems in China. We can customize dosing systems to suit your application. Contact us for quotation.


  • Reliable metering performance. Guided check valves with proven seat and ball designs make our chemical metering pumps the most reliable metering pumps available.
  • Rated for continuous operation, KUOSI industrial pumps will continue to meet their pressure and capacity specifications during long periods of use.
  • No leaks, no seals on the wet end. Diaphragms feature superior construction, Teflon faces, bonded to a composite of Hypalon and fabric layers, and reinforced with metal inserts.
  • Advanced electronics. Our timing circuits are highly reliable and designed to be virtually immune to temperature, EMI and other electrical interference. All electronics are O-ring sealed for water resistance.
  • Pump a variety of chemicals. Fluid end materials include glass-filled polypropylene (GFPPL), PVC, polyvinylidene fluoride (PVDF), fluoroelastomer, ceramic, alloy, and 316SS.
  • Safe and easy to start. Drain valve assembly bypasses chemicals back to the source during filling and allows the injection line to be drained prior to servicing.


  • pH control and regulation
  • Coagulants
  • Cooling tower biocides
  • Boiler feed chemicals
  • Disinfectant
  • Softening agents
  • Odor control
  • Chlorination and dechlorination

Various custom chemical dosing systems


The process of putting a dose of chemical into water for water treatment.

Water flows through the water ejector throat to form a vacuum, which opens a check valve in the water ejector. The vacuum is transmitted to the vacuum regulator through the negative pressure pipeline, and the negative pressure causes the inlet valve on the vacuum regulator to open, and the gas from the pressure gas source flows in. Vacuum regulator in the spring action of the diaphragm to adjust the vacuum degree. The gas is pumped under negative pressure through the flow meter and the regulator valve. The differential pressure regulator controls the differential pressure flowing through the regulator valve and keeps it stable within a certain range. Through the negative pressure pipeline, the gas is sent to the water injector, where it is completely mixed with water to form chlorine solution. From the water injector to the vacuum regulator on the inlet valve the entire system is completely in a negative pressure state. No matter what the reason for the water injector to stop or negative pressure conditions are broken, the vacuum regulator in the bullet-supported gas inlet valve will immediately close, isolating the pressure gas supply.

The chlorine gas supply system consists of two groups of chlorine bottles connected to manifold, filter, vacuum regulator and a set of automatic pressure switching system, each group of chlorine bottles connected by chlorination manifold works independently in working/standby mode, when the pressure switch of the automatic pressure switching system detects that the chlorine gas pressure of the working bottle is reduced to a certain value, it will automatically switch to the standby bottle and start the standby gas source. In order to ensure the safe chlorine supply, the chlorination pipes connected with each group of chlorine bottles are equipped with isolation valves. The system is completely manually operated. The chlorine gas from the chlorine bottles is filtered to remove impurities and then enters the vacuum regulator under pressure. The vacuum regulator transforms the pressurized chlorine gas from the chlorine bottle into negative pressure and flows through the pipe to the chlorinator and connects to the chlorinator. The amount of chlorine through the chlorinator should be proportionally controlled with the water flow, the operator can set a dosage according to the water flow first, when the raw water flow changes, the chlorinator can automatically add in proportion. Before arriving at the water injector near the injection point, the chlorine has been in a vacuum state. In the water injector chlorine is mixed with pressure water to form a solution and then into the water.

  1. Adding swimming pool disinfectant is now a necessary protective measure for swimming pools, and people are paying more and more attention to the quality of water and environment of swimming pools. Swimming pools use disinfectants mainly bleaching powder, sodium hypochlorite, chlorine disinfectant (TCCA), trichloroisocyanuric acid and several other.
  2. The disinfection method used in swimming pools needs to have obvious sterilization efficacy, which can quickly eliminate germs, i.e. 99.9% of microbial strains are solved within 30 seconds.

Chemical dosing pumps have different roles in different stages of liquid treatment, using transfer pumps or circulation pumps when conveying and circulating liquid; called magnetic pumps when handling large flows of liquid; using metering dosing pumps when handling small flows of liquid; and using pneumatic diaphragm pumps when conveying flammable and explosive media.

Cooling water in the cycle of continuous recycling, due to the increase in water temperature, water velocity changes, water evaporation, a variety of inorganic ions and organic concentrations, cooling towers and cold pools in the outdoor by sunlight, wind and rain, the entry of debris, as well as the structure of equipment and materials and other factors, a combination of serious sediment adherence, equipment corrosion and the massive growth of microorganisms and the resulting Biological slime and other problems.

This will make the heat exchange equipment water resistance increased, pump power consumption increased, heat transfer efficiency reduced, so that the production process conditions in an abnormal state. Therefore, the use of cooling water requires comprehensive treatment of the above problems in order to achieve the normal and safe operation of the cooling system.

The chemical treatment method of circulating water system is to add a certain amount of anti-corrosion, scale inhibition, sterilization and other functional agents into the system to achieve the purpose of descaling and sterilization through the chemical reaction of the agents. According to this situation, HAOSH brand metering pump can be used for quantitative dosage of pharmaceuticals to achieve precise dosage control, save labor and dosage, automatic control and other effects to ensure high and safe operation of water equipment.

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