Chemco Cartridge Spun-Bond Open/Open H-26" OD-12.74" SF-84Required minimum quantity: 2 Maximum quantity: 27 Filtration Group Finishings 100% spun bond polyester media is a higher efficiency, surface loading filter media featuring wider pleat spacing than all depth loading filters, resulting in enhanced cleaning capability during back purging cycles and lower pressure drop. Our spun bond polyester cartridges can be pulsed cleaned at lower PSI, saving on compressed air and energy costs, can be washed & reused,