Spa Filter Baleen: AK-40082, OEM: 817-0098, Pleatco: PCST80 , Unicel: C-5396 , Filbur: FC-2975, Diameter: 5-5/16", Length: 21-5/16"

Filter Specifications:

• Square Footage: 100 sq. ft.
• Media/Thickness: 3
• Diameter: 5-5/16"
• Length: 21-5/16"
• Top: 2-1/8" Hole
• Bottom: 2-1/8" Hole

Equivalent to:

• Pleatco: PCST80
• Unicel: C-5396
• Filbur: FC-2975
• OEM: 817-0098

This Filter Fits The Following Brands:

Waterway, Coast 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