Most Popular Filter Cartridges

 This filter is 13 1/2" X 4 15/16" and has a female SAE Large Thick Thread that is 2" which would really nmeassure about 2 1/4-2 3/8" ID. This filter is found in Four Winds Tubs, Barefoot and others. If you have the shorter verison of this filter...

This Filter cartridge is 5 5/16" Wide X 10 1/8" Tall.. It has a 2 1/8" hole on the top and bottom... it is 45 Sq Ft and is found in a lot of different brands... Dynasty Spas, Garden Leisure, Leisure Bay, Recreation Warehouse, Rainbow,Pentair,...

This filter is found only in Sundance Hot Tubs that is 19" long x 8 1/2" Wide and it has a hole in one end that is 2 1/2" that slips over a fitting with a nut ti tighten it into place and a nipple on the other end that is 2" wide that slips into a...

This filter is 9 3/4" Tall x 4 5/8" Wide and is closed on the top and has a 1 1/2" mpt thin threaded nipple that measures about 1 13/16" across the threads. This filter fits some of the Jacuzzi Whirlpool hot tubs that are found under the names Jacuzzi...

This Filter Cartridge fits Some New Cal Spa and Marquis Spas. It is 12 1/2" Tall x 5 3/16" Wide with 2" Mpt Threads which is a think thread that measures about 2 3/8" outside diameter. The MPT Threads measure between 2 1/4 and 2 3/8" edge to edge. It...

This part is a 35 Square Foot Filter Cartridge that is 4-15/16" Outside Diameter x 9-1/4" in Length. It has a hole in the top and the bottom that are 2 1/8". This Filter (The Most Popular) is found many Spa Hot Tub Brands Aber , After Hours , Belize ,...

This Filter is a 30 Square Foot Filter Cartridge that Fits after some 1990 Hot Spring Hot Tubs by Watkins is 6" Outside Diameter x 10 1/2" in Length and has a 1 15/16" top and bottom hole.This fits HotSpring brand tubs only and some of these tubs have as...

This filter is this most popular size and fits 70% of all tubs it is a 25 Square Foot Filter Cartridge that is 4-15/16" Outside Diameter x 13-5/16" in Length. It has a hole in the top and the bottom that are 2 1/8".   For the 50sqft version of...

This Filter is a 40 Square Foot Filter Cartridge that is 6" Outside Diameter x 8 1/4" in Length. It has a 1 1/2" SAE Threaded Fitting which is a Thick Thread that measures about 2" outside diameter of the threads. SAE Threads are really thick. This...

This filter is this most popular size and fits 70% of all tubs it is a 50 Square Foot Filter Cartridge that is 4-15/16" Outside Diameter x 13-5/16" in Length. It has a hole in the top and the bottom that are 2 1/8". Don't just order this filter though...