Filtration System and Reverse Osmosis Plants (RO)


Water Multimedia Filter


Water multimedia filter is the most common type of water filtration, containing multiple layers of sand and carbon/anthracite media. Each layer progressively increases in coarseness and layer depth to separate all the unwanted suspensions from the feed water. The media layers are stacked with gravel (the coarsest and densest) at the bottom and finer, lighter media at the top.

Suspended solids such as small particles of silt, clay, grit, organic matter, algae, and other microorganisms need to be removed to improve the water quality and reduce the total suspended solids (TSS). A media filtration system is an economical and effective treatment option.


The choice of a water media filter depends on different factors that help achieve the best filtration results. These include:

  • The maximum required flow rate.
  • The nature of the suspended solids or turbidity (colloidal or non-colloidal).
  • Water analysis of feed water.
  • Required quality of treated water.
  • Availability of adequate water supply for backwashing process.


Since they can be cleaned easily, media filters are often used to treat high levels of contamination, eliminating the need for replacing filter cartridges or bags and operator efforts.

Media filters can be backwashed, which is an exclusive advantage over other types of filters. Backwashing cleans the filter, removes the accumulated filtered particles, and restores/extends the filter’s performance.

The backwashing can be automatic or manual, depending on the requirement. Both types are available at Emvees.


In a multimedia filter, there are multiple graded layers. The heavier layers are at the bottom and the lighter layers are at the top. The lighter layers usually contain larger grains. This way larger contaminants are filtered out of the water before smaller contaminants. Thus, the filtration efficiency of the filter media increases.

The most common multimedia filter uses sand and anthracite as filtration media. The sand has smaller grains which are heavier than the anthracite. This ensures that the sand layer settles beneath the anthracite and provides finer filtration. A well-operated multimedia filter can remove particles as small as 20 microns.


Reverse Osmosis (RO) is a water filtration process using membrane technology. It removes almost 99% of impurities like salts, ions, and other microns dissolved in wastewater.

Natural osmosis is a process where water flows from lower solute concentration to higher solute concentration, through a semipermeable membrane. This develops osmotic pressure, which stops water from flowing through the membrane after achieving a balance.

For water purification, the reverse osmosis process is adopted by applying external pressure that exceeds osmotic pressure. This reverses the water flow and it flows from higher concentration to lower concentration, through a synthetic semipermeable membrane.

The membrane does not allow impurities, inorganic solids, nor particles larger than .001 microns to pass through it. The treated water is called the permeate stream.

Depending on the quality of the filter and the membrane, all contaminants including bacteria, viruses, parasites, heavy metals, inorganic chemicals, pesticides, and algae are removed. These impurities and contaminants, called the reject stream, are later flushed down the drain.

Our reverse osmosis systems are equipped with membranes of the best quality for high durability and low fouling potential.

We offer the following types of RO plants, depending on the degree of inlet feed water TDS:
  • Tap water RO (TWRO).
  • Brackish water RO (BWRO).
  • Seawater RO (SWRO).
We also offer the following chemicals for RO:
  • Antiscalants (to avoid mineral scaling and extend the membrane’s performance).
  • RO membrane cleaners (to handle scaling and biofouling).

Emvees offers the most economical option while delivering the promise of environmental safety and optimum operation during the installation of RO plants. Our clients will also receive periodic after-sales services to ensure that the system is operating at peak performance.

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