[Excellent Compatibility]: Medium Filter Cartridges for work with QuietFlow LED Filter Size 10, QuietFlow Power Filter Size 10, QuietFlow E Internal Power Filter Size 20, Aquatic Reptile Internal Filters Size 20 and QuietFlow Internal Shrimp Size 10 [Efficient Water Purification]: Our filter consists of double high-density cotton, activated carbon, filter media-Zeolite. Double high-density cotton can filter impurities and debris from the water.3 times activated carbon can effectively absorb 99% of the debris and odors. Zeolite further absorbs heavy metals and balances PH [ filter medium - zeolite]: Our zeolite is a reprocessed zeolite. Our spherical zeolite has a stronger cleaning ability, and it can adsorb heavy metals and other harmful ingredients. Balance PH to achieve a stable water state and improve the efficiency of fertilization of aquatic plants [Quick Install]: Turn off the filter and remove the used and flush the under water to remove dust. After rinsing, insert the into the flushing chamber and make sure the filter fits completely into the chamber [ Filter Cartridges]: We are committed to using filter materials to purify water impurities efficiently. And we recommend that you change the filter every 2 to 4 weeks Color: As Shown Material: Non-Woven Fabric + Plastic Package Contents: 8 * filter elements 4 * filter cotton columns 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.