Filter cassettes size S1: outer diameter approx. 108mm - Inner diameter: approx. 42mm - Height: approx. 73mm. Please check the product size before purchase. For type S1, 29001E, S1 Easyset / PureSpa pool filter cartridge, outdoor garden pool filter 29001. Pool filter cartridges: Package contains 4,6,8 S1 type filter cartridge ,12 which fulfills both your large volume of use and your long service life, and often reduces shopping times for filter replacement. Easy to clean: the filter is easy to clean . Simply remove the filter from the pump and spray off the dirt with a garden hose. Be careful not to wipe forcefully or use a high pressure water jet, as this will damage the filter paper. It is recommended to replace the filter element every two weeks in the summer to keep the water clean. High Quality: The high quality filter element can filter out excess dust and debris, optimize pump performance and extend appliance life. They are made of easy to clean and durable Dacron paper for ultimate filtration.