Advanced Reusable Design - 2 ABS Frames + 8 Filter Media. Our products are designed to be environmentally friendly and reusable, so the 8 pack filter media are equipped with 2 frames for this purpose, so that you can simply mount the filter media on the frames when in use and replace them again and again. This is not only more environmentally friendly, but also a great deal that will reduce your costs. LONG LIFE - The ABS frame lasts up to 10 years, and you only need to change the filter media once every 3 months. 1 filter media will work for 3 months, so 8 filter media will last you 2 years. In addition, the high-strength ABS plastic frame has a lifespan of up to 10 years, and its serrated internal structure locks the filter media firmly in place when in use, ensuring that the product will not collapse or deform, prolonging the product's lifespan and ensuring stable, effective filtration.