The PureT FSPP-45 is a 4.5-inch diameter foam pad separator designed specifically for Big Blue 10" and 20" empty filter cartridges. This lightweight media separator keeps different filtration materials properly divided or serves as void fill to prevent media migration inside your custom filter housings.

SPECIFICATIONS

PureT FSPP-45 Foam Pad Technical Specifications

Manufacturer	PureT
Model Number	FSPP-45
Pad Diameter	4.5 inches ; 0.5 inch thickness
Material	Foam
Compatible Cartridge Sizes	10" and 20" Big Blue empty cartridges
Primary Function	Media separation and void fill
Product Type	Media pad separator

COMPATIBILITY & APPLICATIONS

How to Use the FSPP-45 Foam Separator

The FSPP-45 foam pad is ideal for DIY water filter builders who need to separate different filtration media layers inside Big Blue empty cartridges. Use it to keep KDF from mixing with activated carbon, separate ion exchange resin from sediment media, or simply as void fill to prevent loose media from shifting during operation. The 4.5" diameter fits standard Big Blue 10-inch and 20-inch empty housings, allowing you to build custom multi-media filters with proper layer separation. This separator prevents channeling and ensures each media performs its intended filtration role without cross-contamination.

💧 When building custom filters, use multiple FSPP-45 pads to create distinct filtration zones and prevent lighter media from floating above denser materials during backwash or high flow conditions.

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