I copy this from my RO System manual. This for first time use and after change the filter. Maybe it can help you.
A.With everything connected, turn on the water check for leaks.
B.Make sure the storage tank shut-off valve is "OFF". Open the sink
top faucet.
C.Within a few minutes (up to 15) the water will start to run from the
faucet slowly.
D.Let the water run for at least 30 minutes. This flushes the carbon
filters on first time use.
E.After initial flushing, open the shut-off valve on the tank and close
the sink top faucet.
F.Tank will now full of water (usually 2 to 3 hours) after the tank has
filled. Open the sink top faucet and drain all water until the storage
tank is empty and there is only a small flow from the sink top
faucet.*** DO NOT USE FIRST TANK OF WATER.***
G.Close the sink top faucet. The system is now ready for use.
H.Change filters regularly every 6 to 12 months and have the
membrane checked annually.
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