Spa Filter Baleen: AK-6018, OEM: 111790, Pleatco: PLB50 , Unicel: C-7417 , Filbur: FC-3525, Diameter: 7-1/2", Length: 14- 13/16"

Filter Specifications:

• Square Footage: 50 sq. ft.
• Media/Thickness: 4
• Diameter: 7-1/2"
• Length: 14- 13/16"
• Top: 2-15/16" Hole
• Bottom: 2-15/16" Hole

Equivalent to:

• Pleatco: PLB50
• Unicel: C-7417
• Filbur: FC-3525
• OEM: 111790

This Filter Fits The Following Brands:

Rec Warehouse

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