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Benefits of Side Stream Filters for Cooling Tower

Using side stream filters for cooling water is multi-path filtration, so the water is filtered multiple times, allowing for fine particle sizes to be removed and provides effective filtration even with 20-100 micron.

What is Side Stream Filtration?

Side stream filtration systems reduce the amount of suspended solids, organics and silt particles by continuously filtering a percentage of the cooling tower water (5-15%). Left untreated, this will lead to scaling, fouling and microbiological activity and eventually the cooling system will suffer from reduced efficiency. The filtered water is then returned to the cooling water system for reuse. Side stream filtration is typically used in high-flow cooling towers.

Side Stream Water Filtration:


Side stream skid for cooling tower using Amiad disc filter


Side stream skid for cooling tower using Amiad screen filter

A percentage (5-15%) of the recirculating cooling water volume flows through a water loop, reducing the overall load of solids. This loop then passes through a filtration system.

When to Consider Side Stream Filters

There are some key parameters indicating that a side stream filtration system is needed:

  • The source of makeup water contains high levels of suspended solids, iron, biological and/or organic contamination.
  • Biological growth is an issue although biocide treatment is used.
  • The need to clean chillers and heat exchangers more than every 12-16 months.
  • High corrosion rates in the water loop, including its components.
  • The cooling tower system shows signs of diminished heat transfer and efficiency.
  • The cooling tower sump and/or fill has a high accumulation of solids.

Applications for Side Stream Filters

A side stream filtration system can improve the water quality and the efficient use of energy in these applications, usually in systems where the flow is more than 60 m3/h:

  • When the primary source of makeup water is either surface water or other unclarified source, such as, rivers, streams, lakes, etc., it may contain biological and/or environmental contaminants. These contaminants are too small to be caught by the grate or screen protecting the piping at the inlet, but they will be trapped by a side stream filter.
  • When systems have challenging biological issues and biocide programs are implemented, the number of dead organisms increases. A side stream filter will trap and remove them.
  • Cooling tower systems are prone to fouling even when an anti-foulant program is implemented. A side stream filter will reduce the fouling.
  • Scaling deposits are a cause of heat transfer loss. By reducing fouling, side stream filtration can help keep the heat transfer surfaces scale free.
  • Cooling tower sumps can contain high levels of airborne particles (dust, debris, etc.) which can lead to high dirt loads. A side stream filter will trap these particles that otherwise would contaminate the cooling supply.
  • In instances where the heat exchangers need frequent mechanical cleaning, side stream filters, by continually filtering a percentage of the cooling tower water, can reduce the frequency of mechanical cleaning.

Amiad’s Technologies and Solutions for Side Stream Filtration

Amiad’s technologies and filtration solutions and its full range of filters for side stream filtration help improve heat transfer efficiency, maintain good water quality and reduce operating costs.

Screen Technology

Suction-scanning screen technology combines focused flush with automation to provide 100% cleaning of the screen area. The sophisticated screen is the optimal combination of material strength, filtration efficiency and cleanability, allowing the accumulating filter cake to be rapidly and totally removed.

  • For removal of high and low density particles (≥10)
  • Small footprint
  • Economical
  • Filtration degree: 10 – 1,000 micron

Disc Technology

Spin KlinTM disc technology uses thin, color-coded polymeric discs that are diagonally grooved on both sides to a specific micron size. A series of these discs are stacked and compressed on a specially designed spine, with the top groove in the opposite to the groove below. This creates a filtration element with a significant series of channels, effectively trapping the solids. The disc stack is enclosed in corrosion and pressure resistant housing.

  • For removal of high and low density particles (≥10)
  • Polymeric system for corrosive environments
  • Good filtration performance for organic loads
  • Filtration degree: 10 – 400 micron

Media Technology

Media filters provide depth filtration technology by filtering water through a thick layer of graded granular particles.  Suspended solids are trapped and attach to the filtration media. Available in a wide range of media types – sand, crushed glass, active carbon, anthracite, basalt, etc. The filter vessels are available in various tank construction materials, meeting international drinking water standards.

  • For removal of low density particles (≥1)
  • Filtration degree: down to 1 micron (depending on filter-bed type and raw water quality)

Benefits of Using Side Stream Filters

  • There are numerous benefits that can yield a high ROI by implementing side stream filtration. It is worth mentioning that not all benefits are applicable for all systems or environments and understanding the water quality and contaminants present is recommended before making a commitment.
  • The corrosion inhibitor will be protecting cleaner surfaces given that solids have been filtered out of the system. This reduces corrosion rates and increases equipment lifetime.
  • Side stream filtration, when paired with chemical treatment, will maintain a cleaner system, thus reducing the need to mechanically clean sumps and exchangers. This in turn lowers maintenance costs.
  • Side stream filters keep the system clean for better heat transfer rates, for longer periods, lowering operational costs.
  • Removing suspended solids from circulating water can in some cases deliver higher cycles, reducing the need to replace membranes and lowering maintenance costs.

Official distributor of Amiad in Vietnam

ATS Water Technology Co., Ltd. is responsible for the supply, marketing, technical support and maintenance of Amiad products in Vietnam. Therefore, ATS is committed to providing genuine filter equipment from Amiad with the best technical support and maintenance services for customers. Wherever there is a source of water that needs to be treated ATS has an optimal solution for our customers, we see each challenge as an opportunity to work together to solve the customer's problem.

To update the latest information about the AMIAD self-cleaning filter used in the side sitream filtration system, please visit the link:

ATS Water Technology Co., Ltd is a reliable partner providing high quality technology products in the field of water treatment in Vietnam as well as in the region.

Please contact us immediately for detailed advice!




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