Dual Media Filtration

We offer  Mild Steel (MS) Epoxy Painted and rubber Lined Filters which are available from 200 mm to 3600 mm diameter sizes and from 1 M3 to 100 M3/hr flow rate and are designed and operated on filtration rate of 12-20 m/hr.

Dual media filter contain anthracite along with fine sand reinforced by marbled and gravels. These filter consist of a coating of anthracite (1.25-2.5mm) resting on a coating of fine sand (1-1.5mm) Anthracite is coarse and has more dirt holding capacity as compared to fine sand. Dual media filters are used in places where the raw water contains suspended contaminants, turbidity and iron. Dual media filters provide very efficient particle removal under the conditions of high filtering system amount. These filters use layers of anthracite and garnet contaminants as the filter medium, with filtering system amount of 98% down to 2 microns. The dual media filters employ an automatic backwashing feature, which employs a variety of air and water to maintain unit efficiency.

Advantages and Features

  • Efficient Turbidity and TSS Removal
  • Filter up to 20 – 30 Microns
  • FRP, CS, MSEP, SS Vessel available

  Softener plant

water softener is a unit that is used to soften water, by removing the minerals that cause the water to be hard.

When water is referred to as 'hard' this simply means, that it contains more minerals than ordinary water. These are especially the minerals calcium and magnesium. As more calcium and magnesium dissolved in the water, degree of hardness of the water increases. This is the cause of the fact that soap doesn't really dissolve in hard water. Hard water causes a higher risk of lime scale deposits systems. Due to the scale build-up, pipes are blocked and the efficiency of hot boilers and tanks is reduced. This increases the cost of water heating by about fifteen to twenty percent.

Water softening is the removal of calcium, magnesium, and certain other metal cationsin hard water. The resulting soft water is more compatible with soap and extends the lifetime of plumbing. Water softening is usually achieved using lime softening or ion-exchange resins. Hard water is frequently unsuitable for many industrial and domestic purpose. When water is referred to as 'Hard' it simply means, that it contains excess of calcium (Ca) and magnesium (Mg) Ions than normal water.

Carbonate hardness is known as temporary hardness and non-carbonate hardness is known as permanent hardness. The degree of hardness of the water increases, when more calcium and magnesium ions are dissolves. These ions have their origins in limestone sediments and also from carbon dioxide which is present in all waters exposed to the atmosphere and especially in ground water. The easiest way to soft the hard water is through Ion exchange process.


  • Hard water reacts adversely with detergents. It means even on your little (baby) ones’ Soft towels turn rough on their soft skin.
  • Soaps and shampoos do not lather and leave you feeling unwashed. Your skin gets dry. Hard water makes hair dry and rough leads to hair loss.
  • Hard water causes residual deposit and scale builds up. Damaging your appliances such as heaters, washing machines, showers, dishwasher’s etc. Appliances life comes down by 45%; their maintenance cost goes up by 25%. Causes deterioration and fading of fabrics. Also reduces fabric life by 15%. 
  • Hard water leaves scales which clog pipes, faucets, valves and fixtures. Hard water reduces the cleaning power of detergents. Soft water reduces detergents requirements by about 70%.
  • Makes the food and water taste different. Cooking takes longer than ever before. Cooking gas consumption increases by 30%. Causes scale deposit on utensils.


Softening is the ion exchange process, it is done through resin, the most common and probably the easiest method of removing hardness (that is calcium and magnesium) from water and suitable for utility purpose. As the name implies ion exchange is a process in which undesirable ions are exchanged for more desirable ions. The softening process consists of passing raw water containing hardness through a bed of cation resin in sodium form. The hardness ions Ca & Mg are taken up by resin and in exchange, the sodium ions are relinquished from the resin. This is called the service cycle, where the hard water is being softened.

Water softeners are solution to such problems. It serves the removal of the ions that cause the water to be hard, in most cases calcium and magnesium ions. Iron ions may also be removed during softening.


We offer series of reverse osmosis plants especially designed for the desalination of fresh water for industrial purposes:

Application areas

  • Power Plants: supply of boiler feed water.
  • Electroplating/metal-processing industry: supply of rinsing water.
  • Beverage industry: supply of rinsing water, process and back dilution water.
  • Chemical industry: supply of rinsing water and process water.
  • Supply of rinsing water and process water for laboratory purposes and industrial washers.
  • Car-washing bays: supply of rinsing water.


  • Standard capacities available, on demand higher variation of capacities possible
  • Skid Mounted, compact design to occupy lesser area and easy operation.
  • Use of the newest generation of low pressure membranes
  • High system-salt-rejection up to 95%
  • Integrated semi-automatic cleaning conception and automatic rinsing systems for longer lifetime of membranes available on demand
  • Plants integrated into standard transport containers are available in all versions
  • Permeate capacity series: up to 50 m³/h, on demand also up to 100m³/h


  • Low operation costs compared to other available technologies. 
  • Reduced maintenance and service costs through best production quality with high percentage of in house production, use of durable high quality components and through matured and service-friendly plant design.

  D M plant

DM plants are ion exchange process plant for the removal of  minerals from the water .Strong acid cation + Strong base anion resin systems. These systems consist of two vessels - one contains cation-exchange resin in the hydrogen (H+) form and the other contains anion resin in the hydroxyl (OH-) form (see picture below). Water flows through the cation column, where all the cations in the water are exchanged with hydrogen ions. The decationised water then flows through the anion column, here negatively charged ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O). These systems remove all ions, including silica. 

In general the strong acid cation and strong base anion resin system is the simplest arrangement and DM water that may be used in a wide variety of applications can be obtained with it.Envirotech offers two most common types of deionization which are:


The two-bed de-ionizer consists of two vessels - one containing a Cation-exchange resin in the hydrogen(H+) form and the other containing an anion resin in the hydroxyl (OH-) form. Water flows through the caution column, whereupon all the captions are exchanged for hydrogen ions. To keep the water electrically belanced, for every monovalent Caution, e.g. Na+, one hydrogen ion is exchanged and for every divalent caution, e.g. Ca2+ , or Mg2+, two hydrogen ions are exchanged. The same principle applies when considering anion exchange. The desalinized water then flows through the anion column. This time all the negatively changed ions are exchanged for hydroxide ions which then combine with the hydrogen ions to form water (H2O).


mixed-bed de-ionizers the caution-exchange and anion-exchange resins are intimately mixed and contained in a single pressure vessel. The thorough mixture of Caution-exchangers and anion-exchangers in a single column makes a mixed-bed deionizer equivalent to a lengthy series of two-bed plants. As a result, the water quality obtained from a mixed-bed deionizer is appreciably higher than that produced by a two-bed plant.

Although more efficient in purifying the incoming feed water, mixed-bed plants are more sensitive to impurities in the water Supply and involve a more complicated regeneration process. Mixed-bed deionizers are normally used to 'polish' the Water to higher levels of purity after it has been initially treated by either a two-bed deionizer or a reverse osmosis unit.


  • Ion exchange Vessels
  • Cation Resin of reputed make
  • Automatic / Semiautomatic
  • Multiport valves / High quality Upvc piping & Valves
  • PLC based control panel

  Ultrafiltration Plant

UF systems are suitable for removing high turbidity peaks, particles and microbiological impurities (bacteria, viruses, parasites). Even with temporary or microbiological contamination after heavy precipitation the systems provide a constant filtrate quality – free of turbidity and pathogens.

The extremely robust hollow fiber membranes are operated in the economical cross flow/ dead-end process, thus reducing water and energy consumption to a minimum. A PLC guarantees fully automatic operation of the filtration system. A variety of control options ensures the highest possible degree of flexibility and operational reliability. Adapted to the untreated water quality, chemicals can be optimally added to support the cleaning process.


  • Removal of turbidity with constant filtrate quality independent from fluctuations in the raw water quality.
  • Very high bacteria and virus (referred to MS2 phages) retention rates of 99.999 % and 99.99 % respectively.
  • Compact design ensures convenient installation in existing systems control room or in a container.
  • Optional: Complete solutions with precisely matched pre- and post-treatment as well as waste water treatment.