Rosedale Products’ FSOT300 and FSOT150 Filter Bag Housings

FSOT series filter housing

By Dan Morosky, Vice President of Sales, Rosedale Products, Inc.

Rosedale Products, Inc. is a leading technology developer in the field of liquid filtration systems and waste minimization products for customers around the globe. With more than 50 years of experience, Rosedale offers an exceptional product line that includes high-performance filtration solutions for multiple industries. Rosedale technicians help customers find the best, most cost-effective approaches to their filtration needs.

FSOT300 and FSOT150

The company’s new FSOT300 model is a durable, high-capacity filter with welded construction to meet ASME Section VIII Code requirements. The cover is hinged and fastened with swing bolts for quick access and easy bag change-out. Each unit has a high-quality electropolished finish to resist adhesion of dirt and scale, making routine maintenance fast and simple. It can be customized with several options, including gauges and switches. A wide range of filter bags or cartridges can be utilized in this housing.


The FSOT300 model provides optimal filtration performance when combined with Rosedale’s high-capacity filter bags. Their unique design ensures a 360-degree positive seal and media compression, eliminating the potential for bypass. Unfiltered liquid and debris do not accumulate above the filter bag and contaminate the clean fluid area during change-out. Fluid passes through the bag from inside to outside. The FSOT300 also ensures an even flow into the filter bag, where contaminant is contained for easy disposal.


  • Permanently piped housings are opened without special tools
  • Carbon or stainless steel housings
  • Covers are O-ring sealed
  • O-ring seals: Buna N, EPR, Viton® and Teflon®
  • 300 psi rated housing (FSOT300)
  • ASME Code Stamp available
  • Uses standard #1, #2 or 500 series PL cartridges
  • 1/4-inch NPT gauge ports and vent connection
  • 1/2-inch NPT drain connection
  • Adjustable-height tripod leg assembly
  • Available with extra length legs and evacuation floats
  • Mesh lined and heavy duty rimmed basket available
  • Sanitary and Victaulic connections (available)
  • Basket-Tool included for easy removal

New Bag-Sized Cartridges

Provide Up to 12 Times More Dirt-Holding Capacity

End-users requiring a solution for their frequent filter servicing problems now have an option. The new PL series bag-sized cartridge element from Rosedale Products, Inc. incorporates the advantages of both bag and cartridge type elements into a single, absolute-rated unit capable of handling up to 12 times more dirt over conventional bags before needing to be replaced.

Like bags, Rosedale’s bag-sized pleated cartridges are easy to handle and trap contaminants inside, preventing “wash off” during removal of spent or dirty cartridges. Like cartridge elements, they provide larger surface area and greater dirt-holding capacity than standard bags.


Rosedale’s bag-sized pleated cartridges are uniquely constructed to enhance durability and performance. Twenty-five* square feet of high-efficiency material is sandwiched between two flow-enhancing, coarse-mesh screens and then pleated in a supported construction. This supported pleat construction ensures flow cannot be pinched off, and it also greatly strengthens the overall integrity of the element. The cartridge end caps, made of solid molded polypropylene, are thermo-bonded to the pleated cylinder.


  • Eleven micron retention ratings, from 1 to 110 at 95 percent efficiency, are available
  • Three different top-sealing ring designs – one to fit your needs
  • Available in standard bag sizes 1 and 2, to fit housings 8-15 and 8-30
  • Low pressure drop
    *For size 2 cartridges. Size 1 cartridges have 13 square feet of material.


Like the company’s other filter elements, Rosedale’s PL series bag-sized pleated cartridge elements use polyester or polypropylene micro fibers and standard fibers to produce our high-efficiency filter media. This unique construction provides filtration to 1 micron at 95 percent efficiency: a real rating for the real world, consistently giving the same level of performance from batch to batch.

PL series pleated bag

Greater Capacity, Longer Life

Rosedale’s PL series bag-sized pleated cartridge elements have been tested with the Single-Pass Efficiency Test using water and the AC Fine Dust Test. Water is passed through an initial pre-filter (at 0.45μ), after which contaminant is injected into the water line. An automatic particle counter analyzes the number of particles per milliliter greater than a selected size, before the water enters the filter. The water then passes through the test filter, and the effluent is analyzed for the number of those same-size particles. The number of particles removed provides the efficiency rating. For example, if after the single pass, 95 percent of the particles are removed, then the filter is 95 percent efficient at the specified micron rating.

AB series cartridges

Filtration Efficiency

Using the Single-Pass Efficiency Test, Rosedale has determined the following efficiency ratings for their pleated cartridges. Real ratings are accurate and reliable, time and time again.

Disposable Bag-Sized Pleated Cartridges Provide High Performance at a Low Cost. Compatible with Models 8, LCO, NCO, and Multi-Bag Filters

The new PL series bag-sized pleated cartridge elements from Rosedale Products, Inc. are easily installed in Rosedale’s standard housings. The PLR1CU cellulose filter provides 10 times the surface area of standard filter bags, and the PLR1PF polyester felt provides 6 times the area. Also available are a pleated element insert and a self-contained cartridge/basket combination. These low-cost, high-performing dirt gluttons provide superb capacity with filtration efficiency as high as 99 percent.


  • Available with or without metal cage
  • Seals in a standard strainer basket
  • Over 50 square feet of surface area
  • Beta 100 (99 percent) retention levels
  • Longer element life provides improved system efficiency


  • Fewer change-outs required
  • Less downtime
  • Improved quality due to improved retention ratings
  • Lower maintenance and labor costs
  • Reduced operator exposure
  • Recyclable with no metal (optional)

High Efficiency, Long Service Life

Filter cartridge elements from Rosedale Products, Inc. provide efficient solids removal in liquid systems. Absolute ratings range from 0.5 to 70 microns. Each cartridge has pleated, fixed pore media to maximize surface area and prevent particle unloading and fiber migration. Media selections include cellulose, fiberglass, polyester, and polypropylene. The wide variety of media, filter sizes, and end cap configurations provides customers with an ideal solution no matter their specific application. Superior construction materials and quality control techniques ensure that our filter cartridge elements provide quality filtration, even in the harshest operating conditions.

For more information contact:
Rosedale Products Inc. 3730 W. Liberty Rd.
Ann Arbor MI 48103
Tel: 1-734-665-8201