Installation Guide
Tools Needed:
- Drill with 1/4" drill bit
- Adjustable wrench
- Screwdrivers (flat and Phillips)
- Teflon tape
- Bucket and towels
- Measuring tape
Step-by-Step Installation
- Choose Installation Location: Select a location under sink with adequate space and access to cold water line and drain.
- Shut Off Water Supply: Turn off cold water supply under sink and open faucet to relieve pressure.
- Install Feed Water Adapter: Install saddle valve or T-adapter on cold water supply line following local plumbing codes.
- Mount Faucet: Drill 1-3/8" hole in sink or countertop and install dedicated filtration faucet.
- Install Drain Saddle: Attach drain saddle to standpipe or garbage disposal air gap with proper clearance.
- Connect Water Lines: Connect red tubing to hot water valve (if applicable), blue to cold water supply, and black to drain.
- Mount Filtration Unit: Secure the reverse osmosis unit to wall or cabinet interior using provided brackets.
- Flush System: Open faucet and allow system to flush for 10-15 minutes to remove carbon fines and sanitize.
- Check for Leaks: Inspect all connections for leaks and tighten if necessary.
Specifications
| Model Number | KDFM404KPS |
| Type | 4-Stage Reverse Osmosis Filtration System |
| Finish | Stainless Steel / Chrome |
| Filtration Stages | 4-Stage RO System |
| Daily Production Capacity | 50 gallons per day |
| Contaminant Reduction | 99% of lead, chlorine, cysts, and more |
| Tank Capacity | 3.2 gallons |
| Operating Pressure | 40-80 psi |
| Water Temperature | 40-100°F (4-38°C) |
| Dimensions (Unit) | 16.5 x 6.5 x 17.5 inches |
| Dimensions (Tank) | 11 x 11 x 15 inches |
| Filter Life | 6-12 months (pre-filters), 2-3 years (membrane) |
Warranty Information
- Full Warranty: 1 year parts and labor
- Membrane Warranty: 3 years on RO membrane
- Additional Coverage: Optional extended warranty available
For warranty service, contact KitchenAid Customer Service at 1-800-422-1230 or visit KitchenAid.com
Key Features
4-Stage Filtration
Comprehensive filtration system including sediment filter, pre-carbon block, RO membrane, and post-carbon filter for superior water quality.
Advanced Reverse Osmosis
High-efficiency RO membrane removes up to 99% of contaminants including lead, chlorine, fluoride, and dissolved solids.
Fast Flow Rate
Advanced permeate pump technology provides faster water delivery and reduces water waste by up to 80% compared to conventional RO systems.
Easy Filter Changes
Quick-change filter design allows for easy replacement without tools or disconnecting water lines.
Efficient Design
Compact design fits easily under most sinks while providing high-capacity filtration for entire household needs.
Premium Faucet
Includes high-arc brushed nickel faucet with dedicated filtered water delivery and modern styling.
4-Stage Filtration Process
Stage 1: Sediment Filter
Removes dirt, rust, and other suspended particles down to 5 microns
Stage 2: Carbon Block
Reduces chlorine, chemicals, and improves taste and odor
Stage 3: RO Membrane
Removes dissolved solids, heavy metals, and microorganisms
Stage 4: Polishing Filter
Final carbon filtration for crystal clear, great tasting water
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No water from faucet | Water supply off, tank empty, clogged filter | Check water supply, allow tank to fill, replace filters if needed |
| Slow water flow | Low water pressure, clogged filters, restricted flow | Check water pressure, replace pre-filters, check for kinks in tubing |
| Continuous running | Leaking check valve, faulty auto-shutoff valve | Replace check valve or auto-shutoff valve assembly |
| Water leaking | Loose connections, cracked housing, faulty O-rings | Tighten connections, replace damaged parts, ensure proper O-ring seating |
| Poor tasting water | Exhausted filters, contaminated membrane | Replace filters and membrane following manufacturer schedule |
| Tank not filling | Air pressure issue, clogged membrane, faulty valve | Check tank air pressure, replace RO membrane, inspect valves |
Maintenance Schedule
- Every 6 months: Replace sediment and carbon pre-filters
- Every 2-3 years: Replace RO membrane
- Every 12 months: Replace post-carbon filter
- Monthly: Sanitize system and clean faucet aerator
- As needed: Check and adjust tank air pressure
Manual Downloads
Current Model Manuals
KDFM404KPS
4-Stage RO System - Stainless
KDFM204KPS
2-Stage RO System
KDFM406KPS
6-Stage RO System
KDFM404BPS
4-Stage RO System - Black
Popular Previous Models
KDRS4C
4-Stage RO System - Classic
KDRS3B
3-Stage RO System
KDRS5S
5-Stage RO System
KDRS4W
4-Stage RO System - White