[Sponge Pool filter type H]Length:10 cm/3.93 inch; Outside Diameter: 9 cm/3.54 inch; Inner Diameter: 3 cm/1.18 inch. The pool filter sponge is suitable compatible withtype H pool filter pump, It is designed compatible withfilter pump. [Reusable washable filter] This Sponge pool filter sponge is made of high quality material. Replacing the filter paper filter is part of the daily maintenance of the swimming pool. Regular replacement of the filter may cause high costs. These washable and reusable foam filters reduce your costs. [Good compatible withyour pump]: the sponge filter accessory help to clean particles and debris so that it can prolong the life of your filter media, providing efficient water flow with less clogging compatible withlong lasting filtration and cleaning. [] Regular cleaning every two weeks makes the foams more . The replacement time depends on the frequency of use and the actual situation of the sponges, normally it may last not less than . [Save time and effort]Changing the pool filter is part of regular maintenance compatible withpool,this reusable washable hot tub cleaner tool is much easier to clean and maintain than traditional paper filters, lots of time and effort color: Blue Material: sponge Package Contents: 16 x filter sponges Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.