What's the Final Checklist for an Under Sink RO Installation?

Pre-Startup Connection Verification

Before powering on your system, take a moment to confirm every connection is secure. A thorough inspection now prevents headaches later.

Feed Water Connections

Saddle valve or feed water adapter - Firmly attached to cold water line with no wobble
Feed water tubing - Fully inserted into quick-connect fittings (pushed in until it stops)
Shut-off valve - Present and accessible for future maintenance
Pre-filter housing - Hand-tightened securely with O-rings properly seated

Membrane and Post-Filter Connections

RO membrane - Inserted with double O-rings facing into the housing
Membrane housing cap - Threaded on snugly without cross-threading
Post-carbon filter - Installed with flow direction arrow pointing toward faucet
All tubing connections - Checked for full insertion at both ends

Storage Tank Setup

Your storage tank is essential for delivering water on demand. Proper setup ensures optimal flow rate and system pressure.

Tank Position and Connections

Tank location - Placed upright on a stable, level surface
Tank valve - Turned fully counterclockwise to the OPEN position
Tank tubing - Connected securely to the tank ball valve
Air pre-charge - Verified at 7-8 PSI when tank is empty (check with tire gauge on valve stem)

Tank Accessibility

Service access - Adequate space around tank for future filter changes
Valve accessibility - Tank valve reachable for shutoff if needed
No pinched tubing - Lines routed with gentle curves, no kinks

Drain Line Installation

The drain line carries concentrated waste water away from your system. Proper installation prevents backflow and ensures efficient operation.

Drain saddle - Mounted above the P-trap on the drainpipe
Air gap fitting - Installed if required by local plumbing codes
Drain tubing - Routed downward with no dips or low spots that could trap water
Drain flow - Unobstructed path to drain opening

Faucet Installation Verification

Your dedicated RO faucet is the final point of delivery. Double-check these items for a professional, leak-free installation.

Faucet base - Seated firmly against countertop or sink surface
Mounting hardware - Tightened securely from below (not over-tightened)
Faucet tubing - Connected to post-filter output
Faucet handle - Moves freely between open and closed positions
No wobble - Faucet is stable and doesn't rotate when operated

Comprehensive Leak Testing

This is the most critical step in your installation. Take your time here, even small leaks can cause significant water damage over time.

Initial Pressurization

Place dry paper towels under all connections and the filter housing
Ensure the storage tank valve is OPEN
Slowly open the feed water supply valve
Wait 5 minutes for the system to pressurize

Visual Inspection Points

Feed water connection - Check saddle valve and adapter
Filter housings - Inspect around all housing caps and seams
Quick-connect fittings - Look for moisture at every tubing connection
Tank connection - Verify dry at the ball valve fitting
Faucet base - Check under the sink at faucet supply line
Drain saddle - Confirm seal is secure with no drips

If Leaks Are Found

Turn off feed water supply
Relieve system pressure by opening the faucet
Disconnect and reseat the leaking connection
Repeat the leak test procedure

Initial System Flush

New RO systems contain preservatives and carbon fines that must be flushed before use. This process also allows the membrane to fully hydrate for optimal performance.

First Tank Flush

Allow the storage tank to fill completely (this may take 1-2 hours)
Open the RO faucet and drain the entire first tank
Close the faucet and allow the tank to refill

Second Tank Flush

Once the tank is full again, drain it completely through the faucet
Discard this water as well, it may appear cloudy or have an unusual taste

System Ready Confirmation

Third tank fill - Water should be clear and taste fresh
Flow rate - Steady stream from faucet when tank is full
No discoloration - Water is crystal clear
No unusual odor - Fresh, clean smell only

Final System Checklist

Before considering your installation complete, run through this final verification to ensure everything is in order.

Operational Checks

Feed water valve - Open and supplying water to system
Tank valve - Open and allowing tank to fill
Drain line - Water flowing to drain during production
Faucet operation - Smooth on/off with good flow rate
Auto shut-off - System stops producing when tank is full

Documentation and Maintenance Setup

Installation date recorded - Note today's date for filter change scheduling
Filter change schedule - Mark calendar for 12-18 month pre/post filter replacement
Membrane replacement - Schedule reminder for 12-18 month replacement with pre/post filters

Congratulations on Your Installation

Your under sink reverse osmosis system is now ready to provide many years of clean, great-tasting water for your family.

If you have any questions about your new system or need assistance with future maintenance, our team at Crystal Quest is always here to help. Enjoy your pure, filtered water!