Spa Filter Baleen: AK-6013, OEM: 2396-090, Pleatco: PD90SL-4 , Unicel: C-7409 , Filbur: FC-4020, Diameter: 7", Length: 26-1/4"

Filter Specifications:

• Square Footage: 90 sq. ft.
• Media/Thickness: 4
• Diameter: 7"
• Length: 26-1/4"
• Top: Injection molded knob handle
• Bottom: 1-1/2" Hole

Equivalent to:

• Pleatco: PD90SL-4
• Unicel: C-7409
• Filbur: FC-4020
• OEM: 2396-090

This Filter Fits The Following Brands:

Doughboy Skim-Line

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