[Premium]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 ,it will not pollute the water as 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 and reused, which can reduce your maintenance costs. [Save time and effort] changing the pool filter is part of regular maintenance for pool,this reusable washable hot tub cleaner tool is much easier to clean and maintain than paper filters, lots of time and effort [For sponge pool filters type D/VII]This pool filter is compatible for VII,for Type D swimming pool and spas.Fits for most filters,It is designed for use with for / filter pump. [Replacement]This Foam filter will outlast your paper cartridges and can be washed and re-used over.Advises changing a paper each week, whereas these foams can simply be washed and put back. You should see a foam filter last around 2 months. colour: blue : sponges Size: 9.5x5.2x10.8cm 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 a little different from the real thing. The measurement allowed error is +/- 1-3cm.