Spa Filter Darlly: 70902, Baleen: AK-90280, OEM: 6540-487, Pleatco: PSD90P , Unicel: 7CH-90 , Filbur: FC-2770, Diameter: 7", Length: 19"

Filter Specifications:

• Square Footage: 90 sq. ft.
• Media/Thickness: 3
• Diameter: 7"
• Length: 19"
• Top: 2-1/2" bevel
• Bottom: 1-1/2" MPT

Equivalent to:

• Pleatco: PSD90P
• Unicel: 7CH-90
• Filbur: FC-2770
• OEM: 6540-487
• Darlly: 70902

This Filter Fits The Following Brands:

Sundance 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