Spa Filter Baleen: AK-70003, OEM: 175689,173579, Pleatco: PDM75 , Unicel: C-8401 , Filbur: FC-1970, Diameter: 8-7/8", Length: 19-1/2"

Filter Specifications:

• Square Footage: 75 sq. ft.
• Media/Thickness: 4
• Diameter: 8-7/8"
• Length: 19-1/2"
• Top: 4" Hole
• Bottom: 4" Hole

Equivalent to:

• Pleatco: PDM75
• Unicel: C-8401
• Filbur: FC-1970
• OEM: 175689, 173579

This Filter Fits The Following Brands:

Pentair Purex DM-75

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