Filtration / Microscreening

Rotating microscreen


Microscreening developed out of the treatment of wastewater in Aquaculture, but has now become a leading technology for advanced solids removal.

Microscreens are used as tertiary treatment stage on biological treatment plants where stringent TSS limits have to be maintained even at times of biological process upsets. Their main applications are post clarification, pre-UV disinfection and in some instances as a replacement for traditional sand filtration.

The Rotating Drum Microscreens from IN-EKO are one of the most established, economical and reliable microscreening units on the market. With over 450 installations worldwide the IN-EKO microscreen is well regarded throughout Europe and USA. Operators in New Zealand particularly appreciate its reliability, simple operations and the ability to replace single panel filter cloth sections resulting in low maintenance as well as low capital cost.

NZ references available.

Continuous backwashing sandfilter

Sand Filter

Following development of the first continuous backwashing sandfilter the technology was rapidly adopted in Europe and the USA for larger treatment plants. Due to their size and capital costs these filters were nevertheless not suited for smaller plants. This is when the development of a patented new type of continuous sandfilter (TOVEKO®) specifically designed for small to medium size treatment plants and industrial applications occurred.

The TOVEKO system is a continuously backwashed sand filter that measures only 2.3m high. A compact size that means pumping systems can often be avoided through simple gravity feed set-up. TOVEKO® sand filters do not require the large backwash water tanks associated with conventional sand filters.

TOVEKO® sandfilters are particularly well suited for applications in municipal treatment, potable water (especially Fe and Mn removal) and industrial wastewater treatment.

Its small footprint, modular package plant design with its fully automated operation including backwash rate control, make this sand filter the preferred choice for remote treatment plants where high water quality has to be maintained and the regular presence of an operator is not possible.

NZ references available.

Hunterville Toveko® Sandfilter



The Triton's exceptional performance as a filter underdrain comes from Johnson Screens® Vee-Wire® technology. This construction creates a low profile underdrain with direct media retention while maintaining a high open area with non-plugging characteristics. Available in stainless steel and PVC, Triton underdrains offer high open area combined with direct media retention to optimize filtration efficiency.

Designed for the collection and distribution of water with direct retention of filtering media, the Triton is comprised of stainless steel Vee-Wire wound around and welded to U-shaped channel rods. The design ensures a robust construction while the two point particle contact of the Vee-Wire reduces plugging.

The Triton system is the ideal alternative to block style underdrains. the Triton provides a low profile and high open area percentage to optimize the efficiency of gravity flow media filter basins. 


Because of its simple installation and custom manufacturing, Triton underdrains are easily adapted to existing filters. The low profile of the Triton permits increased depth of media resulting in more efficient filtering of older systems.

Custom Design

Because of its superior design flexibility the Triton underdrain system can be customized to suit your project needs whether it is a new construction or a retrofit.



The compact SCRUFILTER® units can be used in many applications of micro-filtration in order to reduce fine suspended solids from water down to 20 microns. The reduction of suspended solids is accompanied by a reduction in COD, BOD5, phosphorus, nitrates and other substances. In the case of further treatment with UV for disinfection it is important to reduce the turbidity caused by suspended solids. Standard filters are produced with supports in ABS and filter cloths in polyester. These can also be produced completely in stainless steel. The filter cloth is selected according to the requirements which can be 20-­30-­40-­60-­80 or 100 microns. On special request different filter sizes can be produced.


  • Waste water treatment plants (improvement of discharge)
  • waste water treatment plants (removal of phosphates)
  • water recovery (food industry, textile, paper mill, etc.)
  • beverage production plants
  • fish-breeding farms
  • filtration of surface water (river, lake, etc) and well water