How Do I Flush My Reverse Osmosis System?

Why RO Systems Require Extra Flushing

Reverse osmosis (RO) systems require more thorough flushing than standard filters for two key reasons:

Membrane Conditioning

The RO membrane is shipped with a food-grade preservative solution to keep it moist during storage. This solution must be fully rinsed away before the water is consumed.

Post-Filter Activation

Carbon or alkalizing post-filters used for taste polishing may contain fine carbon particles that need to be flushed out. Without proper flushing, initial water may appear cloudy or slightly gray.

Step-by-Step RO Flushing Process

Step 1: Initial Tank Fill

After installation, allow the RO storage tank to fill completely. This can take 2–12 hours, depending on water pressure, system size, and membrane rating.

Step 2: First Flush (Discard)

Once the tank is full:

• Open the RO faucet

• Drain the entire tank

• Keep the faucet open until the flow slows to a trickle

• Close the faucet and allow the tank to refill completely

Step 3: Second Flush (Discard)

After the tank refills:

• Drain the tank completely a second time

• Keep the faucet open until flow reduces to a slow drip

• Close the faucet and allow the tank to refill again

When Is Your Water Ready to Drink?

After two full tank flushes, the system is ready for use.

Quick Reference:

• Tank 1: Flush and discard

• Tank 2: Flush and discard

• Tank 3 and beyond: Ready for drinking and cooking

Important Notes

• Do not use refrigerator ice makers or water dispensers until flushing is complete.

• Slight cloudiness during early use is normal and should clear quickly.

• If taste or cloudiness persists after two flushes, drain one additional tank.

Tips for Best Results

• Be patient during initial fill cycles, rushing will not improve performance

• Mark your calendar for future filter replacements to maintain optimal water quality

Following these steps ensures your Crystal Quest RO system delivers clean, great-tasting water from day one.