Watkins Hot Spring 78373 spa filter – 50 sq. ft.

The Watkins Hot Spring 78373 filter is a 50 sq. ft. replacement cartridge for compatible installations. Check its length and both openings before ordering.

The right filter starts with the right part number

• 50 sq. ft. filter area
• Approx. 6 3/8 in. diameter
• Approx. 14 1/2 in. length
• Two openings measuring approx. 1 15/16 in.

Dimensions and ends

Diameter: approx. 6 3/8 in. Length: approx. 14 1/2 in. Top and bottom openings: approx. 1 15/16 in.

Compatibility

For Watkins Hot Spring systems that use part number 78373. Compare part numbers PWK35B and FC-3921 with the dimensions and ends of your filter.

Maintenance

Rinse the filter media regularly according to the spa manual. If needed, use a cleaner suitable for cartridges and rinse thoroughly before reinstalling.

To confirm your selection, send us the spa brand, model, year, and a photo showing the part number on your current filter.

In the box

• 1 replacement filter 78373, sold individually.

Helpful details

How can I confirm compatibility?

For Watkins Hot Spring systems that use part number 78373. Compare part numbers PWK35B and FC-3921 with the dimensions and ends of your filter.

What is its filter area?

The stated filter area is 50 sq. ft. Also check the dimensions and ends.

Which dimensions should I check?

Diameter: approx. 6 3/8 in. Length: approx. 14 1/2 in.

What type of ends does it have?

Top and bottom openings: approx. 1 15/16 in.

How many filters are included?

One 78373 filter. If your spa uses multiple filters, order the required quantity.

When should I replace the filter?

Replace a cartridge that is damaged, deformed, or can no longer restore the intended filtration after cleaning. Follow the manufacturer's instructions.