1 Superior filtration technology String-wound Filter Cartridges

2 Sedifilt string-wound filter cartridges: New developments in filter media No media migration –Yarn consists of continuous filaments. –No short fibers to come loose and migrate. Sedifilt media

3 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching –No chemicals to leach out with new melt spinning and yarn forming process (patented). –No downstream foaming in filtrate. –100% pure polypropylene.

4 Illustration: Sedifilt graded density structure Finer inner layer Medium middle layer Coarse outer layer Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density –New winding technology. –Continuously controlled pitch, number of crossings and space between each strand of yarn. –Denser winding in inner layers, coarser winding in outer layers. –Consistent winding tension. high structural integrity, more consistent performance.

5 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density High dirt holding capacity –Longer life as particles are trapped throughout the cross-section of the filter. Illustration: Sedifilt graded density structure Finer inner layer Medium middle layer Coarse outer layer

6 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density High dirt holding capacity High bulk media Better performance –Media with high bulk, stable, three- dimensional random structure with multi-lobal cross section filaments. –Captures more particles compared to conventional filters. –Improved solid to void ratio gives higher flow rates with low pressure drop. Multi-lobal cross section High bulk media

7 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density High dirt holding capacity High bulk media Better performance 100% polypropylene –100% pure homopolymer polypropylene. –Wide chemical compatibility. –Excellent micro-organism resistance. –Environmentally safe. –Ease of disposal. –Incinerates to trace ash.

8 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density High dirt holding capacity High bulk media Better performance 100% polypropylene High structural stability No particle unloading –Firm, stable structure. –No shifting of media. –Improved resistance to particle unloading. –More consistent performance. –Excellent knife-edge sealing.

9 Sedifilt string-wound filter cartridges: New developments in filter media No media migration No chemical leaching True graded density High dirt holding capacity High bulk media Better performance 100% polypropylene High structural stability No particle unloading Environmentally friendly –Environmentally friendly disposal. –Incinerates to trace ash. –No hazardous volatiles.

10 5 micron, 10 polypropylene cartridge: Test results Test Method: Water at ambient temperature (25 °C.) Flow in US gallons per minute Test Method: Efficiency and Capacity per ASTM F Instrumentation: LD 400 SN Fluid: Water Flow Rate: 3 gpm (US) Temperature: Ambient Contaminant: ISO Fine Test Dust Shut Off delta P: 21 PSI Test Method: Retention Efficiency and Capacity per ASTM F795 Instrumentation: LD 400 SN Fluid: Water Flow Rate: 3 gpm (US) Temperature: Ambient Contaminant: ISO Fine Test Dust Test Method: Retention Efficiency and Capacity per ASTM F795 Instrumentation: LD 400 SN Fluid: Water Flow Rate: 3 gpm (US) Temperature: Ambient Contaminant: ISO Fine Test Dust Shut Off delta P: 21 PSI

11 Sedifilt string-wound filter cartridges: Economic benefits of Sedifilt Increased filtration capacity –Higher dirt holding capacity Longer lifetime –Fewer change outs Reduced costs –Less labour requirement –Less equipment downtime –Lower inventory levels 5 micron 10"Dirt holding capacity Ordinary string-wound30-55 gm Sedifilt string-wound108 gm

12 Sedifilt string-wound filter cartridges: Filter cartridge range: End adapters and extended cores

13 Sedifilt string-wound filter cartridges: Filter cartridge range

14 Sedifilt string-wound filter cartridges: Applications RO Pretreatment (SDI Reduction) Drinking Water and Beverage Processing Sea Water Desalination Deep Well Injection Gas Purification Cooling Tower Water Filtration Electronics and Electroplating Industrial Process Water Pharmaceutical & Healthcare Chemical Industry ED Automotive Paint Photographic Solutions Wastewater Disposal And more …

15 Comparison with conventional media String-wound Filter Cartridges

16 Conventional media cross-section Round cross-section Fewer micro-voids Lower dirt holding capacity Higher resistance to flow Conventional media cross-section

17 Sedifilt media cross-section Multi-lobal cross-section More micro-voids Higher dirt holding capacity Lower resistance to flow

18 Comparison with conventional media: Conventional media vs. Sedifilt media Sedifilt media has a higher void to solid ratio, giving higher flow rates, improved dirt holding capacity, and lower pressure drop. Sedifilt media cross-section Conventional media cross-section

19 Conventional string-wound filter cartridges: Problems with conventional media Media migration –Short fibers are not properly or fully locked into the main body. –Fibers tend to come loose and migrate into filtrate with flow of liquid and pressure surges. –Loose fiber ends protruding from the surface can be seen clearly in friction-spun yarn media. Friction-spun yarn media

20 Conventional string-wound filter cartridges: Problems with conventional media Media migration Chemical leaching –Spin-finish chemicals (lubricants, surfactants, antioxidants, antistatic agents, emulsifiers, bactericides, etc.) leach out. –Evident as foaming in filtrate. –Washed media is never 100% clean. Friction-spun yarn media

21 Conventional string-wound filter cartridges: Problems with conventional media Media migration Chemical leaching Particle unloading –Round cross-section media have unstable structure. –Under conditions of flow and pressure surges, unstable round yarns shift, giving rise to tunneling effect and particle unloading. Unstable structure of conventional cartridge of friction- spun yarn allows a paper clip to be pushed through the media.

22 Conventional string-wound filter cartridges: Problems with conventional media Media migration Chemical leaching Particle unloading Poor knife-edge sealing –Unstable edges cause seal by-pass problems. Conventional cartridge of friction-spun media

23 Conventional melt-blown cartridges: Melt-blown media Only Advantage: Freedom from process chemicals Disadvantages: Tendency to collapse under moderate pressure differential Requires supporting core Very poor knife- edge sealing Particle unloading Melt-blown filter cartridge

24 Resin-bonded filter cartridges: Resin-bonded media Disadvantages: Higher cost Limited chemical compatibility Bonding agent compatibility problems Poor density grading Lower dirt holding capacity Prone to media migration – media crumbles easily Poor knife-edge sealing Resin-bonded filter cartridge

25 Pleated paper cartridges: Pleated paper media Only Advantage: Absolute ratings are possible Disadvantages: Consists of more than one material Weak strength of thin paper media Pleat pinch-off and pleat collapse problems Pleated paper cartridge Pinched pleat Collapsed pleat

26 Comparison of surface and depth filtration Direct interception Particles larger in size than the pores deposit on surface of media Numerous tortuous flow passages Direct interception and dirt retention within depth of media Complex mixture of mechanisms

27 Reduced costs Increased filtration capacity Higher performance Superior filtration technology Longer lifetime String-wound Filter Cartridges