Spa Filter Baleen: AK-3013, OEM: N/A, Pleatco: PPI25-4 , Unicel: C-4328 , Filbur: FC-2650, Diameter: 4-15/16", Length: 9-13/16"

Filter Specifications:

• Square Footage: 25 sq. ft.
• Media/Thickness: 4
• Diameter: 4-15/16"
• Length: 9-13/16"
• Top: Closed
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PPI25-4
• Unicel: C-4328
• Filbur: FC-2650
• OEM:

This Filter Fits The Following Brands:

Santanna Spas

Filter Glossary

As you can see in this graphic, when looking at a filter's threads from the side the difference is very obvious. Standard, sometimes called "MPT" or "Male Pipe" threads are smaller and have a higher number of threads than the S.A.E. style. The S.A.E. threads are large and are square in nature almost resembling a child's toy.

• MPT: Male Pipe Thread
• FPT: Female Pipe Thread

How to measure a hot tub filter references:

Spa Care Center or Pool Care Center