Bestway Filter 2-pack Cartridge V (For 330gal. Pump) Genuine bestway flowclear #58168 replacement filter cartridge. Fits bestway flowclear 330 gallon per hour model 58144 and 58144us filter pumps. Measures 3. 1" (8. 0cm) high x 3. 3" (8. 3cm) diameter. Sold in twin pack only. Does not fit model 58145 bestway flowclear filter pump.