Double 20" Big Blue Filter Set: 1 Micron & 0.1 Micron Absolute Pleated Filter 

What is the difference between a Nominal Micron rating and an absolute Micron Rating? 

An "Absolute" filtration rating means that the filter material has been specifically manufactured, and passed lab testing to ensure that 99.9% of the particles larger than the stated micron rating of the cartridge will be captured (trapped) on the surface or within the filter itself.  In the case of our 0.1 to 0.2-micron Absolute Filters, this means that you will get the most effective removal of bacteria and organisms possible with 10" or 20" Big type Filter Cartridges. 

Most sediment filter cartridge types such as Melted Sprays (PP), String Wound, Normal Pleated, and Antibacterial Melted Spray, have what is referred to as a nominal filter rating. Essentially what this means is that the micron rating of a filter is the approximate "average" size (diameter) of the pores on its surface and within the cartridge itself. It is generally accepted that filters with nominal filter ratings will retain (trap) around 85% of the particles equal or greater in size to the stated micron rating.

Additional Options 

Change Standard 1 Micron Melted Spray to Antibacterial Option

The Melted Spray Antibacterial filters like the standard melted Spray type are designed to capture dirt, sediments, visible particles, and bacteria.

However, the Melted Spray sediment filters have had a silver ion additive added to their material, which creates a bacteriostatic function to inhibit the growth of bacteria on the surface of the filter, helping to ensure healthier product water and a longer life span of the filter.

This option is ideal for source waters that have a very high bacterial / organism count and will help to extend the life of the filter.