https://pearlwater.in/domestic-sediment-filter RO sediment filters by Pearl Water Technologies are essential to remove physical contaminants such as rust, sand, and dirt and in turn safeguard the RO membrane. 1 The costs are variable, ranging usually from ₹179 to ₹699 for the one-to-five pack, depending on the exact type and capacity. They also are available in size such as 10 or 11 inches with 5-micron filter.