Water filtration stages: purification stages and technologies

In an era of growing environmental awareness, water filtration is becoming an indispensable part of everyday life. It is not just a matter of improving taste or clarity – it is primarily about safety and health. The water purification process is a multi-stage system that effectively eliminates contaminants – from visible particles such as sand or rust to elements invisible to the naked eye.

Today’s threats in water are often microscopic and hard to spot without special tech. These can include:

• Pesticides – residues of plant protection products used in agriculture,
• Microorganisms – bacteria, viruses and protozoa,
• Heavy metals – such as lead, mercury and cadmium, which accumulate in the body,
• Drug residues – pharmaceutical substances present in sewage and groundwater.

 

What are the stages of drinking water filtration?

Water filtration stages are successive purification steps that systematically eliminate various types of contaminants. Each stage performs a specific function. Together, they form a comprehensive system that provides clean, safe and tasty water straight from the tap.

Stage 1 – Mechanical filtration

Mechanical filtration is the first and basic stage of water purification from mechanical impurities. Its task is to retain solid particles visible to the naked eye, such as:

• sand,
• silt,
• rust,
• other mechanical impurities.

For this purpose, mesh or foam filters are used, which act as a precise sieve. This stage not only improves water clarity, but also protects subsequent filters from clogging and damage, which translates into a longer service life for the entire filtration system.

 

Stage 2 – Carbon filtration

After initial purification, carbon filtration takes place, the purpose of which is to remove chemical compounds that affect the taste, smell and safety of water. Activated carbon effectively absorbs:

• chlorine,
• pesticides,
• herbicides,
• other organic substances.

Thanks to its porous structure, activated carbon acts like a sponge, absorbing unwanted compounds. The result? The water becomes safe, free of unpleasant odours and much tastier – which is particularly important in households.

 

Stage 3 – Water softening

Water softening involves removing calcium and magnesium ions, which are responsible for water hardness. This process is carried out by passing water through ion exchange resin, which converts calcium and magnesium ions into sodium ions. Softened water means fewer problems and greater comfort of use. The benefits of this stage include:

• no limescale deposits in kettles and washing machines,
• longer service life of heating systems,
• lower risk of household appliance failure,
• savings in equipment operating costs.

 

Stage 4 – Water iron removal

In many regions of the world, water contains excessive concentrations of iron and manganese, which manifests itself in rusty discolouration, a metallic taste, and deposits on fittings and appliances. This is not only a matter of aesthetics, but also of the durability of domestic infrastructure. The iron removal process involves passing water through catalytic or oxidising filters, which effectively eliminate these elements. The result is:

• cleaner water,
• no stains or deposits,
• better protection of installations and appliances.

Our offer includes a softener and iron remover that softens water and additionally removes iron, manganese and ammonium ions using a specialised filter.

 

Stage 5 – Reverse osmosis

 

Reverse osmosis is one of the most effective filtration methods. Water flows through a special membrane that retains almost all impurities, including mineral salts, bacteria, viruses and chemical compounds. It is an ideal solution where maximum water purity is required, e.g. in coffee machines, aquariums or laboratories. However, it is worth remembering that reverse osmosis also removes beneficial minerals, which is why it is often combined with a mineralisation process.

 

 

Stage 6 – Ultrafiltration – an alternative to osmosis with mineral retention

Ultrafiltration is an effective alternative to reverse osmosis, especially if you want to preserve the natural minerals in the water. This process removes bacteria, cysts, larger viruses and organic contaminants. At the same time, it leaves valuable elements such as calcium and magnesium in the water. It is the ideal solution for those looking for a compromise between safety and nutritional value.

 

 

Stage 7 – UV disinfection

UV disinfection is often used in the final stage of filtration. Water flows through a lamp emitting ultraviolet radiation, which effectively neutralises bacteria, viruses and other microorganisms.

This method is completely safe, does not require the use of chemicals and is free from the risk of recontamination. It is particularly recommended when using water from wells or reservoirs exposed to biological contamination.

 

Stage 8 – Water mineralisation – enrichment with minerals after filtration

After intensive purification – especially using reverse osmosis – water can be too ‘sterile’, i.e. deprived of valuable minerals. Mineralisation is a process that restores the following to water:

• calcium,
• magnesium,
• other essential elements.

This not only improves the taste of the water, but also supports the body’s daily functioning.

Our range includes the Magnesium Booster cartridge with innovative MNX technology containing high-quality magnesium. This cartridge releases up to 70 mg/l of pure magnesium into the water. The magnesium cartridge offers the best alternative to bottled water.

 

Which filtration system to choose?

The choice of the right filtration system depends on many factors:

• Water sources (tap, well, rainwater),
• The pollutants we want to remove,
• Water purposes (drinking, cooking, whole house),
• Budget and available space.

It is often best to seek help from professionals who, after testing the water, will be able to determine the best filtration method for us.