Unicel® C-5345 – 45 Sq Ft Rainbow/Waterway Spa Filter Cartridge – part #C-5345

Turn off the spa and access the filter compartment.

Remove the old cartridge and dispose of it properly.

Rinse the new C-5345 thoroughly before installation.

Insert the filter into the housing, aligning both open ends.

Turn the spa back on and check for proper filtration flow.

Q: What spa brands does this filter fit?

A: It fits Rainbow, Waterway, and compatible systems using a 45 sq ft, open-ended cartridge—verify dimensions to confirm fit.

Q: Is this filter reusable?

A: Yes, rinse weekly and use a filter cleaner monthly to prolong its lifespan.

Q: How often should it be replaced?

A: Typically once a year, or sooner in high-use spas or poor water conditions.

Q: Is this the same as the Pleatco PRB45-IN?

A: Yes, it is an equivalent replacement made with Reemay® filter media.

Q: Can I use this in saltwater spas?

A: Yes, it's compatible with chlorine, bromine, saltwater, and mineral systems.