Spa Filter Baleen: AK-70010, OEM: 18219RO100, Pleatco: PAST75 , Unicel: C-8474 , Filbur: FC-0901, Diameter: 8-15/16", Length: 15"

Filter Specifications:

• Square Footage: 75 sq. ft.
• Media/Thickness: 4
• Diameter: 8-15/16"
• Length: 15"
• Top: 3-3/4" Hole
• Bottom: 3-3/4" Hole

Equivalent to:

• Pleatco: PAST75
• Unicel: C-8474
• Filbur: FC-0901
• OEM: 18219RO100

This Filter Fits The Following Brands:

Astral 2507 CE Terra, Speck Pumps AC

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