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Stages of water purification system

Stages of water purification system

Drinking water, as well as consuming filtered water, is essential for good health, but having access to clean water is a pipe dream in this day and age. The water purification system comes into action at this point. Water purifiers will eliminate germs, bacteria, lead, and other impurities from your water while also regulating the pH. There are several stages of water purification. In this article, we will talk about the stages of the water purification system.

Water treatment entirely influences the safety of drinking water. Water must be tested to ensure it meets regulatory criteria for safe drinking water. Meeting these standards is crucial to ensure that water is appropriately filtered and has a positive impact on the community. Clean drinking water is critical to a community’s health and safety. Understanding the stages of water filtration is so crucial.

The stages of water purification system

  1. Aeration

The water is aerated by bubbling compressed air via perforated pipes after it is collected in a big aeration tank. Bad smells and CO2 are removed via aeration. It also eliminates metals like iron and manganese by causing them to precipitate as their respective hydroxides.

  1. Screening

A screening purification system is used to purify water from lakes, rivers, or groundwater. Large natural pollutants are kept out of the water by this filtering. Anything from wood to fish can be used. Screening is not required for groundwater sources since its extraction from the ground functions as a natural screening process in and of itself.

  1. Coagulation

Chemicals having a positive charge are introduced to the water during coagulation. The positive charge in the water destroys the negative charge of dirt and other dissolved particles. The particles connect with the chemicals and generate somewhat bigger particles as a result. Specific kinds of salts, aluminum, or iron are common compounds employed in this stage.

  1. Flocculation

Coagulation is followed by flocculation. In this process, flocculation gently mixes water to produce bigger, heavier particles Known as flocs. During this phase, water treatment companies frequently add extra chemicals to aid in the formation of flocs.

  1. Sedimentation

Sediment refers to the floc and soil particles that sink to the bottom of the storage tank. During this procedure, both the sediment and the water move into a sedimentation basin. Sedimentation tanks are designed to slow the velocity of the water flow in order to allow suspended materials to settle more easily. The heavier floc particles sink to the bottom of this basin once more and will remain there until they are removed.

  1. Filtration

After the flocs settle to the pond’s bottom, the clean water on the surface is filtered to eliminate any leftover particles. During the filtering process, clean water passes through filters with varying pore sizes and materials (such as sand, gravel, and charcoal). These filters remove dissolved particles and germs such as dust, chemicals, parasites, bacteria, and viruses. Activated carbon filters also eliminate unpleasant odours.

  1. Disinfectants

Finally, disinfectants are used to purify filtered water. For example, chlorination. In water, a disinfectant kills pathogenic and other microorganisms. Following disinfection, the water is pumped into an overhead tank for domestic distribution.

Depending on the quality of the source water that enters the treatment facility, water may be treated differently in various areas. Most of the water that enters the treatment facility is either surface water or groundwater.

Because lakes, rivers, and streams contain more sediment (sand, clay, silt, and other soil particles), germs, pollutants, and poisons than ground water, they require more treatment and filtering.

But the water in Bangladesh is so polluted that everyone requires a water purifier in their home. In that case, RO water purifiers are the best choice. They are basically mini water treatment plants at home.

The steps of RO water purifier are-

  • Sediment pre filter
  • Carbon pre filter
  • 2nd carbon pre filter
  • RO membrane
  • Polishing filter

There are 3 stages, 4 stages and even 5-6 stages RO purifiers but the above-mentioned stages are mostly in every type of RO purifier.

Here are some ideas about RO purifiers. There are several types of water purifiers for domestic use. Here you can check the water purifier price in Bangladesh at an affordable cost:

  • Pureit

Pureit introduces the all-new Marvella Slim RO+UV+MF, which has superior 7-stage filtration and a mineral cartridge that enhances clean water with mineral goodness. All water goes through the RO system, ensuring that cleansed and contaminated water do not mingle. Only RO can remove hazardous compounds like as lead, mercury, and other heavy metals. Enriches water by adding essential minerals like Calcium and Magnesium. So, the best water purifier price in Bangladesh which is of course pureit, is around tk 21,500.

  • Kent

Purifier KENT Bangladesh, the House of Purity, the most trusted brand in healthcare and home appliances, provides you with unique solutions to safeguard your family from waterborne infections, airborne diseases, pesticides and chemicals in fruits and vegetables, and dust and mold in mattresses. They have very affordable price range which starts from 20,000 tk.

  • Ultima

The ULTIMA Royal RO Plus UV Water Purifier is the best wall-mount RO System for medium and big families, with a Real Time TDS and a beautiful design. It has a comprehensive USA Technology-based RO protection system, as well as a robust 100GPD (378L/Day) purification system and a 12L storage capacity. This water purifier price in Bangladesh starts from Tk. 25,000.

  • Eureka

Eureka prime guarantees that the water is completely safe to drink. By eliminating chlorine and bacterial pollutants, they give a better tasting and smelling drinking water. They use Reverse Osmosis technology in 5 stages of filtering. Their water filters filter leads out of drinking water before it is consumed, keeping the hazardous chemical from entering the body. The cost of a water purifier starts at tk 11,000.

  • Walton

The Walton WWP-RO12L filters water and removes dust, pathogens, smells, dissolved solids, and suspended particles using reverse osmosis technology. It has a pH and chlorine control feature as well. This filter has a capacity of 12 litres and cleans water in five stages. At only tk 9000, the price is really fair.

  • Puricom

Puricom is one of the most innovative ROO technology companies. Puricom filters are classified by the sort of job they do. RO Systems, Zero Installation Purifiers, Water Purifiers, Direct Flow RO Systems, Smart Water Systems, Water Dispensers, Commercial and Industrial RO Systems, and Water Softeners are some of the options available. Only 18,000 tk will be charged.


Even though water treatment plants are trying their best to make the water clean and drink worthy but it’s better to double clean the water just to be on the safe side, so a water purifier is a necessity.