[For sponge pool filters type A]Fits for most filters,It is designed for use with for filter pump models: A/603/604/G,637R/638R/G,635T/636T/G. [Premium Material]The swimming pool filter foam are made of high quality sponge,can be washable,re-used and can be use long time. The sponges are made of environmentally friendly material,it will not pollute the water as well as the environment. [Effective to clean]the sponge spa filter cleaner has advantages of low cost and long service life; and the foam filter sponge can be cleaned many times and reused, which can reduce your maintenance costs. [Save time and effort] changing the pool filter cartridge is part of regular maintenance for pool,this reusable washable hot tub cleaner tool is much easier to clean and maintain than traditional paper filters,save you lots of time and effort [Replacement]This Foam filter will outlast your paper cartridges and can be washed and re-used several times over.Advises changing a paper cartridge each week, whereas these foams can simply be washed and put back. You should see a foam filter last around 2 months. Enjoying a pool through summer (and other seasons) requires Sponge Pool filter type A. These washable and re-usable foam filters will reduce your costs. Initial cost of this cartridge is slightly more than a paper cartridge yet will outlast a cartridge by a This Foam filter will outlast your paper cartridges and can be washed and re-used several times over.Advises changing a paper cartridge each week,whereas these foams can simply be washed and put back. Material: Sponge Item color: blue size: 20 x 10cm Please Note: 1.The pool filter must be replaced regularly to maintain the efficiency of the filter as a practical tool. Package Contents: 4 x filter sponges Only the above package content, other products are not included. Note: Light 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.