W5W American Plumber Whole House Sediment Filter Cartridge (2-Pack)American Plumber is a trusted name in water filtration that offers you peace of mind with their high quality products. The W5W sediment reduction filter helps put cleaner, better tasting water in your home. The W5W is designed for general purpose filtration and works great for well water applications. The W5W has a lower micron rating than the W30W and W50W filters and gives you even better sediment filtration.