Ships fast! Reduces 99% of TDS Includes one reverse osmosis membrane Use with microbiologically safe water The Hydrologic 22155 is a replacement Reverse Osmosis membrane for the Triton Reverse Osmosis system. This product has a high membrane capable of reducing up to 99% of TDS. The 22155 by Hydrologic produces up to 100 gallon per day when used with microbiologically safe water. For a better deal this Hydrologic 22155 includes one reverse osmosis membrane. Order today!