Roleigh….“ what is the part number of your 1 micron (absolute) filter equivalent to the one I showed from Dudadiesel.”
>>>>>NO, Global Filter, Part # is just the description below for their Standard Mesh Liquid Bag .
Type Fiber – NMO (Nylon Monofilament)
Micron Rating – 1 (micro rating ranges from 1 – 1500)
Bag Finish - Plain
Bag Size - 1
Bag Style - PESS
The bag you have from Dudadiesel has its emphasis in “supplies for SVO, biodiesel, solar water heater technology and will soon also push for solar electrical cells (PV cells), wind power, geothermal systems and energy efficient devices such as LED lights and systems which recycle heat.”
Global Filters has its emphasis in “High Purity Pleated Filter Cartridges for liquid filtration in a variety of Industries including: Food & Beverage, Pharmaceutical, Enzyme, Ethanol, Electronics, Water Service, Reverse Osmosis Pre-filters, Chemical, Petro-Chemicals, Refining, Cosmetics, Ink/Paint.
“What do you mean by "absolute"?”
>>>>> My mistake! Thanks for catching that. It should read:
A NOMINAL rating is attached to filters that can be shown under controlled conditions to remove an acceptable statistical amount of particles of a certain size, even though the actual pores or openings of the filter may be much larger that the particles being removed. The typical way that a nominal filter rating is reported would be in the form of a statement such as: “Removes >99.9% of particles 3μm (micron) or larger.” This means that under field conditions, a user can be confident that the filter will remove greater than 99.9% of pathogenic organisms larger than 3 μm. This information is obtained by challenging filters with test waters containing suspensions of 3μm spheres. A similar cryptosporidium or giardia claim would require a challenge using live cryptosporidium or giardia organisms. Nominal ratings are usually applied to depth filters.
An ABSOLUTE rating can only be applied to a filter that the end user can actually determine the size of the largest pore. Such a filter can be integrity tested using a non-destructive test method and the data can be used to determine the actual size of the largest pore. Absolute ratings can only be applied to membrane filters (see definition below) due to the requirement of a definable pore. If a filter manufacturer applies an absolute rating to a filter, they should be able to provide the user with a non-destructive test protocol that will allow the user to verify the absolute rating.
“Ken, when you state the micron range for Dudadiesel, that is for the range of all of their filters. They sell pre-filters that average 1 micron, others that are 5 micron, and others with less filtering ability.”
>>>>> “micron range for Dudadiesel” above should read micron range for Global Filters do range from 1 – 1500 microns in their Standard Mesh Liquid Bag Models....they have other models not applicable to this discussion. http://www.globalfiltercorp.com/StandardMeshLiquidBags.html
“As I mentioned, I use the pre-filter always in conjunction with something else (either steripen, chlorine dioxide tablets, or combo sawyer .1 micron filter and chlorine dioxide tablets)).”
>>>>>Likewise, I prefilter and us UV or a .02 micron Sawyer PURIFIER.