Spa Filter Baleen: AK-6091, OEM: 17-2811, 17-4984, Pleatco: PFAB100-4 , Unicel: C-7699 , Filbur: FC-1950, Diameter: 7-7/8", Length: 22-1/8"

Filter Specifications:

• Square Footage: 100 sq. ft.
• Media/Thickness: 4
• Diameter: 7-7/8"
• Length: 22-1/8"
• Top: 3-1/16" Hole
• Bottom: 3-1/16" Hole

Equivalent to:

• Pleatco: PFAB100-4
• Unicel: C-7699
• Filbur: FC-1950
• OEM: 17-2811, 17- 4984

This Filter Fits The Following Brands:

Pentair Pac-Fab Mytilus 100, Wet

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