[for EZ-Change #1 Aquarium Filter ]for EZ-Change number 1 filter is compatible with 5-15 power filters. (Please confirm the size of your fish tank and tank filter before purchase)[Efficient Water Purification]Each fish tank filter contains premium activated carbon, the grid design makes full contact between the activated carbon and water, durable and long lasting, it offers clean and water for fish, make them more healthier.[Timely Replacement]Aquarium filters 5-15 gallon fish tank are easy to change. To optimal cleanliness, we recommend replacing the aquarium filter cartridges every 2 to 4 weeks. No messy assembly required, changes in seconds just shake and rinse.[Quick Installation]Please turn off and remove the used and flush the new under cool water to remove dust. Our filter is already set up and just needs to be installed correctly on the power filter and it is ready for quick filtration.Colour:blueMaterial:Sponge + plasticSize:A: 12 x 12.5cmPackage Contents:6 x Filter 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.