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

The Watkins Hot Spring 78373 filter is a 50 sq. ft. replacement cartridge, sold individually. Its two openings must match your spa’s filter housing.

Compatibility: choose the right filter

Some Watkins Hot Spring systems use part number 78373 or the equivalents below. Confirm the model and dimensions.

Specifications and dimensions

• Filter area: 50 sq. ft.
• Diameter: 6 3/8 in.
• Length: 14 1/2 in.
• Top and bottom openings: 1 15/16 in.
• Contents: 1 filter

Equivalent references to compare

• Pleatco PWK35B
• Filbur FC-3921

Before purchasing, compare the part number, dimensions, and both ends with your current filter. An equivalent reference must also match your system’s configuration.

Maintenance and replacement

Rinse the filter media regularly according to the manufacturer’s recommendations. For more thorough cleaning, use a cleaner suitable for spa filters. Replace the cartridge if it is damaged, deformed, or can no longer be cleaned effectively.

Need help choosing?

Write to Piscine Hippocampe with the spa’s brand, model, year, and a photo of your filter showing its reference number. You can also browse our spa replacement cartridges.