Reliable Material: 5 micron water filter made of 100% polypropylene material, it meets the NSF 42 certification, ISO9001, BPA free. There is no fibers shedding because of unique melt-blown technology to avert the re-contamination of drinking water. High Capacity Efficiency Filtration: This sediment water filter removes 99% rusts, silts, sands, part of bacterias and other undissolved particles, etc, from dirty water. As the first-stage filter in the filtration system, it protects your post-filters, water appliances and pipes with higher quality water, providing a healthy life style.