Water pretreatment

1. Mikrofiltration (MF) and ultrafiltration (UF)

Conventional tertiary filtration is often unable to deliver the required performance and reliability necessary to meet the new objectives. Tertiary filtration is often supplemented or replaced with microfiltration (MF) or ultrafiltration (UF) membranes in the technology selection process. The required effluent quality can be achieved with membranes at a lower cost.

A main factor for the successful operation of RO membrane is maintaining a constant high feed water quality. With the application of MF or UF membranes before RO membranes lower chemical cleaning frequency and RO membrane replacement are expected due to the superior UF permeate water quality as well as the benefits of a reduced footprint and easier operation of UF.


  • - High level of filtrate quality
  • - Retention of suspended solids and microorganisms
  • - High chemical resistance
  • - Longer RO membrane lifetime
  • - Lower chemical cleaning frequency by RO
  • - Reduced footprint

2. Media Filtration

The granular media filtration process is effective at removing particles significantly larger than a few micrometers or smaller than 0.1 μm. As water passes through the filter bed, the suspended particles contact and adsorb onto the surface of the individual media grains or onto previously deposited material. To achieve a high treated water quality, the surface charge, size, and geometry of both suspended particles and filter media are major parameters. The turbidity of media filtrate is around 0.1 NTU.

Greentech offers pressure filter systems with different filter materials for the most varied of objectives:

  • - Sand filter
  • - Activated carbon filter
  • - Filters to remove iron and manganese


  • - Removes turbidity and TSS effectively
  • - Simple design
  • - Easy operation, maintenanceand installation
  • - Low energy requirement
  • - Cost effective