![]() 5-micron filters installed up-stream of ion exchange resin columns to remove particles and down-stream to remove resin fines that could pass through under drains and clog a pure water system.1 to 50 micron filters used in general purpose applications, with the 5-micron cartridge being the most popular.The melt blown 5-micron cartridge is used extensively for both commercial and domestic applications. The standard 10”, 5-micron, melt blown filter cartridge is the least expensive and most widely used filter cartridge on the market today. Melt blown filter cartridges are particularly effective on well waters and normal city water. Filter Cartridge TypesĪ melt blown filter cartridge is a “depth” type filter that is good for the removal of relatively uniform sized particles throughout the body of the filter, not just on the surface. Construction of these housings differ with respect to the operating pressures. Generally Carbon Steel and FRP housings are used for water treatment applications and stainless steel housings are preferred for high purity water treatment applications. Filter HousingsĬartridge filter housings are available in different material of construction as required and to suit for the end user applications. ![]() ![]() Consult the manufacturers’ ΔP recommendations for the specific filter cartridge being used. For example, pleated membrane filters normally require replacement at a ΔP of 15 psig, while string filters are still going strong at a ΔP of 25 psig. (It also increases the effectiveness of the filter, so cartridges shouldn’t be changed unnecessarily.) The difference in pressure before and after a cartridge filter is the pressure drop, or ΔP (Delta P).ĭifferent filter configurations and micron ratings have different ΔP replacement specifications. This restriction reduces the flow rate through the cartridge and increases backpressure. When to Replace a Filter CartridgeĪs particles accumulate on a filter cartridge, flow through the filter becomes restricted. With some of the pleated filter cartridges, a cleaning can restore an acceptable pressure drop. In most cases the attention needed is cartridge replacement. No pressure drop at all indicates that the filter is either breached or that the seals are not working, and again needs attention. ![]() The pressure drop across a cartridge filter is used to determine the condition and effectiveness of the cartridge.Ī high pressure drop across a cartridge filter, over the maximum recommended pressure drop, indicates that the cartridge probably needs replacement. An absolute rating indicates that the filter will remove 99% of the particles. The micron size ratings can be “Nominal” or “Absolute.” A nominal rating indicates that the filter cartridge will remove 95% of the particles of that micron size. Micron ratings for filter cartridges range from 50 microns (all filter cartridge types) down to 0.035 microns (Pleated membrane cartridges).įor RO (Reverse Osmosis) normally 10 µ, 5 µ and 1 µ cartridge elements are used. One micron, symbolized by the Greek letter μ, is also known as a Milimicron, which is 1/1,000,000 meter. Micron Cartridge Filters RatingsĪll cartridge filters have micron ratings that indicate the smallest sized particle they are capable of removing. This is achieved by specially designed cartridge elements to be housed inside the Filter vessel. As the name suggests the Micron Cartridge Filters are filters which filter the water to designated Micron rating. ![]()
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