Bestway I Filter, Dimensions: 9 cm x 8 cm The Bestway Type I pool filter cartridge is made of polyester to ensure more efficient operation of the filter pump Easy to clean and replace if necessary; Designed for Bestway I Filter Pumps Replace every 2-3 weeks Compatible with 300/330 gph filter pumps (220-240 V) The high-quality filter element can filter out excess dust and dirt, optimize pump performance, and extend the life of the devices. The filter element is mounted in the filter pump and catches dirt as it passes through the system, helps remove dirt, and provides you with clean, fresh water. Easy to install, and the cartridges can be easily cleaned and reused thanks to their premium material blend. It is recommended to replace the filter element every two weeks in summer to keep the water clean.