Spa Filter Baleen: AK-7004, OEM: CX900RE,25230-0095S, Pleatco: PA90-4 , Unicel: C-8409 , Filbur: FC-1292, Diameter: 8-15/16", Length: 17-3/8"

Filter Specifications:

• Square Footage: 90 sq. ft.
• Media/Thickness: 4
• Diameter: 8-15/16"
• Length: 17-3/8"
• Top: 4" Hole
• Bottom: 4" Hole

Equivalent to:

• Pleatco: PA90-4
• Unicel: C-8409
• Filbur: FC-1292
• OEM: CX900RE, 25230-0095S

This Filter Fits The Following Brands:

Hayward Star-Clear Plus C900, Sta-Rite

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