ZOTEE Spa Filter Cartridge 8-1/4 x 6 in, 2-Pack — Fits Filbur FC-0359, Multi-layer Pleated Dirt-Locking

Whether you're maintaining an inflatable tub, a plug-and-play hot tub or a built-in spa, the ZOTEE replacement cartridge was made to match common OEM specs while improving debris capture. Built from reinforced plastic end caps and a multi-layer pleated fabric that ZOTEE calls "Dirt-Locking" technology, this two-pack delivers the dimensions and thread pattern required by many Filbur, Unicel and Waterway-compatible filters.

How does this filter match my spa's size and fittings?

The ZOTEE cartridge measures 8-1/4 inches long with a 6-inch outside diameter, a semi-circular handle on top, and a 1-1/2" SAE threaded bottom for straightforward replacement. These dimensions and the thread type are the same as Filbur FC-0359 and multiple equivalent part numbers, so it drops into many common housings without adapters.

• Length: 8 1/4" (210 mm) end-to-end
• Outer diameter: 6" (152 mm)
• Top: semi-circular handle for easy removal
• Bottom: 1 1/2" SAE threaded connection

What filtration performance can I expect?

ZOTEE's pleated fabric is engineered to trap hair, leaves, dust, sediment and sand more effectively than standard filter media. The multi-layer construction increases surface area so more debris is captured before the filter needs cleaning, helping pumps run cleaner and reducing chemical load.

• Multi-layer pleats increase filtration area
• "Dirt-Locking" fabric holds fine and coarse particles
• Designed to reduce visible debris and prolong pump life

How do I clean and maintain these cartridges?

Routine rinsing and periodic deep cleaning extend the filter's useful life and help keep water clearer. The cartridge is made from durable materials that tolerate repeated washing; with proper care, a cartridge typically lasts 1–2 years depending on use and water conditions.

• Rinse with a hose after each use to remove surface debris
• Use a filter cleaner soak every 4–12 weeks for deep cleaning
• Inspect pleats and seals; replace when damaged or permanently stained

Which models and part numbers does this replace?

This ZOTEE cartridge is sold as a direct replacement for many common OEM numbers used across spas and portable tubs. It’s compatible with Filbur and Unicel types plus several Waterway and third-party equivalents, making it a convenient universal option.

• Filbur: FC-0359, FC-0359M
• Unicel: 6CH-940 (and 6CH-940RA variants)
• Waterway and others: 817-0050, PWW50P3, PLF6CH-940, XLS-601

Who is this for? If you own an inflatable spa, plug-and-play hot tub, or a backyard spa that uses Filbur/Unicel-compatible cartridges and you want a reliable, economical two-pack that improves debris capture and is simple to maintain, the ZOTEE Spa Filter Cartridge is a practical choice. It suits homeowners who prefer swapping and cleaning cartridges themselves and service technicians looking for a robust aftermarket replacement that fits a wide range of models.