Rainbow® C-2608 Cartridge Filter – 8 Sq. Ft. Replacement Element – part #C-2608

Q: What spa systems does this filter fit?

A: It fits Pentair Dynamic Series I–IV filter housings that use 8 sq. ft. cartridges. Check your model’s label for confirmation.

Q: Is this an OEM filter or aftermarket?

A: Rainbow C-2608 is the OEM model, but Filbur FC-2401, Unicel C-2608, and Pleatco PRB8 are high-quality equivalents.

Q: How often should I replace this filter?

A: Typically every 3–6 months, depending on spa usage and water quality.

Q: Can I clean and reuse this filter?

A: Yes, regular rinsing can extend its life, but it should still be replaced routinely.

Q: What are the physical dimensions of this cartridge?

A: It measures approximately 4.625" in diameter, 8.0" long, with a 2.125" inner core.

Power off the spa system and relieve pressure from the filter housing.

Remove the filter lid or access panel according to manufacturer instructions.

Take out the old filter cartridge and rinse the filter well with fresh water.

Insert the new Rainbow C-2608 cartridge with the correct orientation.

Secure the filter housing, restore power, and run the system to check for leaks.