Features:

• New 2008 Improved model
• Full case of 6 Filter cartridges
• Easy to clean Dacron filter material
• for Intex model# 51, 621, 633, 520 & 530 filter pumps
• for Intex 2000 to 4000 gph filter pumps

Editor Reviews:

Product Description:
Intex Brand Original Type B Large Pool Filter Cartridge, Parts# 59905 59905T 59905W - for 2000, 2500, 3000 & 4000 GPH Krystal Clear Model 51 520/520R 530 633 & 621 Pool Pump - Case of 6 Units, Packed in Original Manufacturer's Packaging.

Rating : - Cartridges fit pump and work fine.
Not much else to say - they work fine. One small point - they don't include a "holder" down the center tube for the 1" or 3" chlorine tablets.