Membrane Prefilters

for filtration to 1.0 micron Dirt Carrying Capacity

Rosedale's Graded Density (GD) Fat Bags® bags have approximately four times the dirt-holding capacity of our Beta Bags at equivalent filtration levels. These bags have 9 layers of microfiber material, each with 4.4 sq. ft. of surface area.
You can now use bags where dirt carrying needs previously required cartridges. Bags cost less, are easier to install and remove, require less room in storage and disposal, and prevent the contaminant wash off downstream associated with cartridges.
These bags offer excellent results when used as a pre-filter for membrane filtration.
It will retain a large quantity of contaminant that will unnecessarily clog the membrane.
The bags are available in either all polyester or all polypropylene construction. Polyester
should be used where oil adsorption is not desirable or where higher temperatures are required.

Design Details
All Graded Density Bags have a 304 stainless steel retaining ring sewn in their opening. Heavy-duty handles, sewn to the reinforced bag lip, are a standard feature. They make bag removal faster and easier. The bags are sewn, then turned inside out to avoid leakage through the threads. They are also made with sewn, fully-shaped bottoms to enhance the pressure capacities of the bags. There are two sizes available. Size 1 is 7 inches by 16 inches. Size 2 is 7 inches by 32 inches.

Filtration Level
These bags have been tested by an independent laboratory to determine the filtration efficiency of the media used in each of the filter bags. The efficiencies for polyester and polypropylene are identical. Tests that were conducted using a size 2 bag and AC fine test dirt at 20 GPM, show dirt holding capacities for the following filtration ratings (at 20 psi).

More Information

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