The most common reason for the water flow to slow or stop on our reverse osmosis unit would be a filter change is needed
Blocked filters - replace filters
Bent pipes - Check if any pipe on the system is not bent or squeezed.
RO membrane inserted incorrectly - Important that the Membrane needs to be inserted into the housing by the tip with two black rubber O-rings and push fully inside.
Bypass valve opened - The pipe going to drain is connected to the flow restrictor on the unit. Flow restrictor is the white piece with the number 300 on it. This flow restrictor is bypassed with a valve. This bypass valve has to be closed all the time. So please check if it is closed.
Inlet valve closed - Open the inlet valve
Airlock in the system - Airlock after filter change. Close the tank and open the tap. On a non pumped reverse osmosis system open the bypass valve on the flow restrictor for a few minutes. Then wait till some water flows from the tap. If water flows from the tap then close the tap. Wait till the unit is pressurized (till RO stops). Then open the tank.
Low or high pressure in the storage tank - Close the inlet valve and close the valve on the storage tank. Then disconnect the tank from the RO system. Open the valve on storage and drain the water from it to the sink. Drain it till the storage tank is empty. When it is empty check with the pressure gauge the pressure in the storage tank. There is the same valve as on the bicycle on the bottom of the storage tank for this pressure test. The pressure should be about 7 psi when the tank is empty. Release the pressure from the valve or increase it with the foot pump or compressor if needed. If everything is fine, connect the storage tank back to the RO system. Open the inlet valve and valve on the storage tank and let the system refill back. If the storage tank pressure is not possible to increase or decrease then the storage tank bladder is probably faulty and the whole storage tank needs to be replaced.
If it's a unit install and the above does not change the issue you are having Low Pressure - Non-pumped RO is connected on low pressure below 2 bars. Need to be installed RO with a pump.
Flow restrictor blocked replace the flow restrictor.