Cartridge filter replacements. Replace your filter anytime it shows physical wear such as fraying fabric, torn band, and warped or cracked ends. Your filter may need replacing if, even when water is balanced and filter is clean, your water just doesn't get clear. 

Pleatco makes a complete range of filters for most hot tubs and pool filters on the market. Contact us with dimensions and/or make & model and we can find your replacement.

The two options shown here measure 5" diameter, 13 5/16" height, and 2" hole - no thread.  This is the most commonly used size in the hot tub industry.  Replacement for C-4950 (50sq.ft) or C-4326 ( 24 sqft).