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WHAT IS A SEDIMENT FILTER?
A sediment filter`s main purpose is to remove particulates from water. It is rated by a micron number which refers to the size of the particles that the filter will trap. These are often required as a pre-treatment for other types of treatment such as reverse osmosis, ultraviolet disinfection and carbon filtration. Keep in mind that sediment filters only reduce particulates. They do not remove chemicals or make the water taste/smell better.
WHAT ARE THE DIFFERENT TYPES OF SEDIMENT FILTER CARTRIDGES?
There are three main types of sediment filter cartridges:
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Spun Polypropylene - Also known as "melt-blown," spun polypropylene filters provide a high contaminant holding capacity because it contains multiple layers that make it very thick.
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Pleated Polyprolene - Offered in absolute micron rating, these "paper filters" can be used more than once. It removes sand, sediment, silt, rust particles. and much more.
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String Wound - These filters hold the highest dirt capacity. The string wound filters trap the smallest particles that improve the quality of water.
WHAT IS THE DIFFERNCE BETWEEN NOMINAL AND ABSOLUTE RATING?
Nominal rating typically means that the filter can trap a certain percentage of a stated size (e.g. 80% @ 1 micron depended upon manufacturer). Absolute rating is the smallest particle size held by a filter at 100% efficiency.
HOW OFTEN SHOULD SEDIMENT FILTERS BE REPLACED?
Typically, the filters should be changed every 6 to 12 months but it depends on usage.
WHY IS IMPORTANT TO HAVE A MULTI-LAYER SEDIMENT FILTER?
Multiple layers allows for a better distribution of filtration making it possible to have less pressure drop for the water. See figure below.
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