You've probably forgotten to turn off the tap a few times and the water has leaked out of the water tank because you didn't realize it was full.
You are not the first or the only one who has found themselves in such a situation. You can avoid this problem and forget about it by installing this kit in your tank. It also means that the osmosis system no longer produces water when the tank is full. When using the pressure pump kit, water production will also stop until the system produces water again.