Ultima Reverse Osmosis Membrane 24 GPD 24 Gallon per day for all Ultima Water Systems reverse osmosis models 5, 6, 7, and 7000. Will work with most RO systems with a flow restrictor rated at 150ML to 200ML. Will reduce TDS in your water 90% to 95% for healthy and delicious drinking water. Includes: 24 gallon per day membrane, replacement quick connect flow restrictor for easy replacement. Includes the new service manual "How to Service Your Reverse Osmosis System" by Dionicio Porras. Service your reverse osmosis like a pro!