Methods and apparatus for preventing damage by a reverse osmosis filtration system having a leak

Reverse osmosis filter apparatus comprising:

• a reverse osmosis filter system;
• a pan connected to the reverse osmosis filter system and located at the bottom of the reverse osmosis filter system to collect water that leaks from the reverse osmosis filter system;
• a non-electrical, water sensing shut-off valve connected to the pan and having a water sensing pellet, the water sensing shut-off valve being coupled between a raw water input and the reverse osmosis filter system, to sense presence of water collecting in the pan;
• wherein when the presence of water collected in the pan is sensed, the water sensing pellet swells to urge the non-electrical, water sensing shut-off valve toward a closed position that closes the non-electrical, water sensing shut-off valve to disconnect the reverse osmosis filter system from the raw water input.