Three things that prevent 90% of installation failures
- Push every tubing connection to the insertion mark (~0.8″) and then pop the blue lock clip onto the fitting. A partial insertion creates no seal. A missing lock clip pops out under pressure.
- Do NOT open the RO faucet during the 5-minute startup flush. Let the automatic flush complete fully. Water is not drinkable until the TDS reading appears on the display.
- Connect to COLD water only. Hot water damages the RO membrane and is not detected by the system. Verify the supply is cold before making the feed water adapter connection.
System specifications
| Models covered | WD-G3-W (White), WD-G3-B (Black), WD-G3-G (Grey), WD-G3P600 |
| System type | Tankless under-sink RO with built-in booster pump |
| Capacity | 600 GPD (G3P600 model) |
| TDS rejection rate | Above 90% when working properly; ±10% depending on source water |
| Operating water pressure | 14.5 – 87 PSI (minimum 14.5 PSI required) |
| System dimensions | 18.12″ (H) × 17.72″ (W) × 5.67″ (D) |
| Power supply | 24V DC external adapter — plug directly into wall outlet, not a power strip near water |
| Input water | Cold water supply ONLY |
| Faucet type | Smart Digital RO Faucet — built-in TDS display and filter life indicators |
| Customer support | 1-888-352-3558 (U.S.) · Mon–Fri 8 AM–5 PM PST · service@waterdropfilter.com |
Filters and filter positions
Each filter locks in with a 90° clockwise twist. The arrow on the filter moves from the EMPTY circle to the SOLID circle mark on the housing. If you don’t hear a click, the filter isn’t seated correctly.
Twist each filter clockwise 90° — EMPTY circle → SOLID circle. You should hear a click.
| Position | Filter | Part number | Rated life |
|---|---|---|---|
| Top — CB | Activated Carbon Filter | WD-G3-CB | 12 months or 1,100 gal |
| Middle — CF | Pre-sediment & Carbon Block Filter | WD-G3-CF | 6 months or 550 gal |
| Bottom — RO | RO Membrane Filter (G3) | WD-G3-RO | 24 months or 2,200 gal |
| Bottom — RO | RO Membrane Filter (P600) | WD-G3P600-RO | 24 months or 2,200 gal |
Tubing color code and connections
After every connection: push tubing to the insertion mark (~0.8″), then pop the blue lock clip onto the fitting.
| Tubing color | Size | Route | Function |
|---|---|---|---|
| White | 3/8″ PE | Feed water adapter → INPUT port (H) | Cold water supply into system |
| White | 1/4″ PE | RO faucet → FILTERED port (I) | Purified water to faucet |
| Red | 1/4″ PE | Drain saddle (M) → WASTE port (J) | Waste/concentrate to drain |
- Push to the insertion mark (~0.8″) — partial insertion creates no seal and will leak
- Install the blue lock clip after every connection — without it, tubing can disconnect under pressure
- To disconnect: remove the blue clip, then press the lock sleeve while pulling the tube — never pull tubing directly without pressing the sleeve
8-step installation guide
Shut off the cold water supply valve. Open the kitchen faucet to bleed pressure until flow stops. Disconnect the cold water pipe from the supply valve. For 3/8″ pipe: thread the feed water adapter (with washer) onto the cold water supply valve; tighten with an adjustable wrench. For 1/2″ pipe: remove the two converter fittings from the adapter first. Thread the cold water pipe back onto the adapter. The white 3/8″ INPUT tubing is pre-attached to the adapter.
Insert the faucet spout into the faucet body. Feed the faucet stem, power cord, and filtered water tubing through the sink or countertop hole. From underneath, slip on the mounting washer and nut; tighten securely. If no hole exists: drill a 1″ hole using a diamond core bit for granite, or a carbide bit for stainless steel. Start at the lowest speed and do not use a hammer drill on natural stone, glass, or ceramic.
Install on the vertical section of the drain pipe, above the P-trap. Installing on the P-trap curve creates a siphon effect. Paste the foam seal onto the drain saddle front plate — align the seal hole with the plate hole. Drill a 1/4″ hole through the front wall only — do not penetrate the opposite wall. Insert the red waste tubing ~0.6″ into the drilled hole. Position the back plate and tighten screws evenly. Pop the blue lock clip onto the fitting.
Confirm cabinet dimensions accommodate the housing (18.12″ H × 17.72″ W × 5.67″ D). Do not place the housing directly against the cabinet wall — vibration during pump operation amplifies noise when touching surfaces. The power outlet must be inside the cabinet or on an adjacent wall. Any partition opening for the power cord must not exceed 1.5″ in its longest dimension.
Cut all tubing squarely with scissors or a sharp utility knife — a diagonal cut prevents proper seating. Remove the port plugs before connecting. 5a — INPUT (H): white 3/8″ tubing from feed water adapter. 5b — FILTERED (I): white 1/4″ tubing from RO faucet. 5c — WASTE (J): red 1/4″ tubing from drain saddle. Push each tube to the insertion mark (~0.8″). Pop the blue lock clip after every connection.
Insert the RO faucet power cord into the FAUCET connector (G) on the back of the housing; tighten the nut. Insert the DC head of the power adapter into the POWER port (F). Do NOT connect the power adapter to the wall outlet yet — wait until after filters are installed and all connections are confirmed.
Remove the wrapping and protective cap from each filter. Insert each filter into its corresponding hole on the housing front — CB in top, CF in middle, RO in bottom. Align the filter arrow with the EMPTY circle mark on the housing. Twist clockwise with light force for 90° until the arrow aligns with the SOLID circle mark. You should hear a click. Repeat for all three filters.
Turn on the cold water supply valve and check immediately for leaks at all connections. Plug the power adapter into the wall outlet. The system starts an automatic 5-minute flush — the filter indicators will flash blue/yellow/red, then turn blue — do NOT open the RO faucet during this flush. After the automatic flush completes, open the RO faucet and run for 30 minutes (accumulative) until the display shows a TDS reading. The water is not drinkable until the TDS reading appears. Secure the power adapter with the included cable tie away from any water sources.
The TDS display shows dashes (———) while flushing. Only when a numeric TDS reading appears is the water safe to drink. The reading during the first 10–30 seconds of dispensing is also higher than actual — wait for it to stabilize.
TDS display and filter life indicators
Filter life is tracked by usage time OR gallons processed — whichever comes first.
TDS display states
| Display state | What it means |
|---|---|
| Dashes (———) on TDS display | System is flushing — water is not yet at drinking quality |
| 3-digit number (e.g. 005, 012) | TDS reading in mg/L — system working normally; water is drinkable |
| Display off (front panel) | System stopped dispensing — display turns off after 5 minutes of inactivity |
| Display off (faucet screen) | System stopped dispensing — faucet display turns off after 1 minute |
The G3P600 provides above 90% TDS rejection when working properly. If TDS rejection drops below 80% (output TDS is more than 20% of your source TDS), the RO membrane filter needs replacement regardless of the indicator status.
Automatic flushing — when it happens and what to do
Filter replacement — step by step
- Turn off the water supply valve
- Open RO faucet to release pressure
- Twist old filter counter-clockwise to unlock (arrow returns to EMPTY circle)
- Pull filter straight out
- Remove cap from new filter and insert
- Twist clockwise 90° to SOLID circle (click)
- Turn water supply back on; check for leaks
- Reset the indicator (see right)
- Flush per required time before drinking
After every filter replacement you must reset the indicator. If you skip this, the indicator won’t track the new filter’s remaining life.
2. Hold for 7 seconds
3. System beeps to confirm reset
Each filter has its own button — press the correct one.
Error codes — official reference
Cause: Internal moisture has activated the leak sensor inside the unit.
- Unplug the power adapter immediately
- Pull out the water container at the back of the unit
- If there is water in the container, clean it and dry thoroughly
- Check all quick-connect fittings inside the unit for loose connections
- Dry any moisture inside the unit completely
- Plug back in — E02 should clear automatically
- If E02 reappears shortly after restart → contact Waterdrop: 1-888-352-3558
Cause: The booster pump has been running continuously for too long.
- Power the system off and back on to recover
- Check for tubing crimps or blockages in the input water line
- Verify water pressure is within 14.5–87 PSI range
- Check CF and CB pre-filters — replace if showing yellow or red indicators
- If error recurs → contact Waterdrop: 1-888-352-3558
Cause: The booster pump starts and stops frequently due to internal pressure imbalance.
- Power the system off
- Fully open or fully close the RO faucet — do not leave half-open
- Check all tubing for crimps, kinks, or blockages; remove any restrictions
- Ensure the RO faucet is not blocked or partially clogged
- Power the system back on
- If error recurs → contact Waterdrop: 1-888-352-3558
Troubleshooting quick reference
| Problem | Most likely cause | Solution |
|---|---|---|
| System won’t power on | Switched or tripped GFCI outlet; adapter not fully seated | Check GFCI outlet; confirm 24V adapter fully inserted into POWER port; try a different outlet |
| No or very low water flow | Supply valve not open; tubing kinked; filters not properly locked; clogged pre-filters | Open supply valve fully; inspect tubing for kinks; re-seat all filters to SOLID circle; replace CF/CB if yellow or red |
| Leaking connections | Tubing not at insertion mark; missing blue lock clip; angled cut on tubing | Re-push tubing to ~0.8″ mark; install blue lock clip; cut tubing squarely and reinsert |
| High TDS or poor taste | Initial 30-min flush not complete; reading in first 10–30 sec; RO membrane end of life | Complete 30-min flush; wait for TDS to stabilize; replace RO membrane if rejection below 80% |
| Continuous beeping | E02 leak detected; or filter at red warning status | Check E02 procedure above; or replace expired filter immediately |
| Filter indicator won’t reset | Button not held long enough; wrong button pressed | Hold the corresponding button (CB/CF/RO) for full 7 seconds until system beeps |
| Unit vibrates or is noisy | Housing against cabinet wall; normal pump noise | Leave a gap between housing and cabinet wall; pump noise during filtration is normal |
Maintenance schedule — at a glance
| When | Task | Part number |
|---|---|---|
| Every 6 months or 550 gal | Replace CF filter; reset CF indicator; flush 5 min (automatic) | WD-G3-CF |
| Every 12 months or 1,100 gal | Replace CB filter; reset CB indicator; flush 15 min (faucet open) | WD-G3-CB |
| Every 24 months or 2,200 gal | Replace RO membrane; reset RO indicator; flush 30 min (faucet open) | WD-G3-RO / WD-G3P600-RO |
| At every filter replacement | Inspect all tubing and fittings for leaks; confirm blue lock clips present | Visual only |
| If TDS rejection drops below 80% | Replace RO membrane regardless of indicator status | WD-G3-RO / WD-G3P600-RO |
| Periodically | Confirm power adapter is secured with cable tie away from water; check for wear on cord | Cable tie if needed |
Phone: 1-888-352-3558 · Mon–Fri 8:00 AM–5:00 PM PST
Email: service@waterdropfilter.com · Website: waterdropfilter.com
For E02, E03, or E04 errors that recur after attempted repair, contact support directly — some require the unit to be returned or serviced.