DEEKOOL PBF40M Spa Filter Replacement 2-Pack — Compatible with Pleatco PBF40, 30 sq ft, Trilobal PET

DEEKOOL 2 Pack PBF40M spa filter is a direct replacement cartridge designed to fit Pleatco PBF40/PBF40M and Bullfrog Wellspring 30 Coreless filter housings for reliable hot tub filtration.

This two-filter set gives spa owners a washable, pleated replacement made from trilobal PET fabric with roughly 30 square feet of media per cartridge. Built with an open-top hole of 3 3/8" (3.375") and a larger bottom opening of 4 1/2" (4.5"), each filter measures about 6 1/4" (6.25") long and 8" in diameter. The filters do not include a threaded core and have no side slot; the larger bottom opening is intended to align with the notch in many spa mounting assemblies.

How do I know this filter will fit my hot tub?

Check the critical dimensions and mounting style of your existing cartridge. This DEEKOOL PBF40M matches Pleatco PBF40/PBF40M and Bullfrog Wellspring 30 Coreless housings but lacks a slot and relies on a larger bottom opening to seat in the tub.

• Top opening: 3 3/8" (3.375") internal hole
• Bottom opening: 4 1/2" (4.5") internal hole
• Length: 6 1/4" (6.25") — Diameter: 8"
• Does not fit STIL series; pre-2017 tubs may require adapter 10-00417

What material and filtration performance can I expect?

The cartridge uses a trilobal PET spunbond fabric and a pleated construction to increase surface area and maintain flow. The fabric's dirt-locking behavior captures hair, sand, sediment and other debris while letting water pass to protect pumps and heaters.

• Approximately 30 square feet of pleated media per filter
• Pleated design for greater contaminant-holding capacity
• Trilobal PET material is washable and resists rapid clogging

How do I install and orient the filter correctly?

Orientation matters: the narrow opening faces up and the wider opening faces down toward the tub base. Line the bottom notch with the spa mounting assembly so the filter seats without spinning; then secure the top cap snugly but not over-tightened.

• Narrow/top opening up, wider/bottom opening down
• Look for the small bottom notch to lock into place
• Filter only — threaded core not included

How should I maintain and when should I replace these cartridges?

Rinse and lightly spray the pleats regularly to remove trapped debris; frequency depends on use and water conditions. The PET fabric is washable and reusable for multiple seasons, but replace the cartridge when pleats remain stained or flow is noticeably reduced.

• Washable trilobal PET fabric — rinse with low-pressure water
• Inspect monthly in heavy-use periods; clean when visibly dirty
• Replace when pleats are stained, torn, or permanently clogged

Who is this for: Spa and hot tub owners who need a cost-effective, reusable replacement filter compatible with Pleatco PBF40/PBF40M and Bullfrog Wellspring 30 Coreless systems. Ideal for DIY maintenance-minded users who want a dependable pleated cartridge with clear fitment specifications — check your original filter dimensions and mounting style before purchasing to ensure compatibility.