Perfect compatibility with Whisper Bio-Bag External Filter PF10, Whisper External IQ10, Whisper 10i Internal Filter, and TetraFauna ReptoFilter 20 gallons. Effectively catches debris and fish waste, absorbs heavy metals from water, and improves water taste while maintaining pH balance. 3-layer vertical filtration with dual-sided mesh for enhanced debris and waste capture. Recommended replacement every 2-4 weeks to optimal water quality, depending on fish tank population. Quick installation process by flushing the new under clean water before use. This aquarium filter is designed to provide efficient filtration for aquarium setups. It helps maintain a clean and healthy environment for your fish by effectively removing waste and impurities from the water. Regular replacement of the filter is essential to the best water quality, and the quick installation process makes it easy to keep your aquarium in top condition. Color: Green Material: Filter Cotton Package Contents: 16PCS Medium Filter Cartridges 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.