DAF Spare Parts to Keep On Hand

Murphy’s Law says, “Anything that can go wrong, will go wrong.”

There’s a lot to be said for being prepared. FRC has performed quite extensive testing on all parts used on our DAF systems, and we believe them to be of the highest quality, but inevitably something is going to fail. It might not happen this month, this year, or even next year, but eventually something will go awry. It’s at that time you’ll want to make sure you’ve got your DAF spare parts on hand.

Every FRC DAF system uses the same components, albeit slightly different in size. Here’s the core list of DAF spare parts you should always have on hand. If you don’t have these yet, contact us. We’ve got your file and will quote the right parts to you.

DAF Aeration Assembly

  • Poly Flow Tubing
  • 90 Elbow FNPT x FNPT Fittings
  • NPT Straight Fittings
  • Close Nipple Fittings

Skimmer Assembly

  • Sprockets
  • Pillowblock Bore Bearing
  • Drive Motor
  • Conveyor Chain (assembled)
  • Conveyor Chain (links)
  • Hinge Pins

Auger Assembly

  • Drive Motor
  • Gland Packing

Pneumatic Panel

  • Solenoid Valves
  • Pressure Switch
  • Air Flow Meter
  • Filter Regulator
  • Poly Flow Tubing
  • Misc. Straight, 90 Elbow & Tee NTP x P/L Fittings

If you think your stock of spares is looking pretty slim, use this DAF spare parts request form and we’ll get you what you need.

The Right Way to Perform a DAF System Startup

If you’ve just got your hands on a shiny new DAF system, you’re probably anxious to get the thing running. But before you start muddying it up with wastewater, there are a few important things to run through. Follow this 10-step guide to perform a proper DAF system startup.

1. Review the Operation & Maintenance Manual

You’ve absolutely got to understand how the system functions and the right ways to keep it working for years to come.

2. Set the Operational Valves in Their Correct Position

This includes pump isolation valves, feed valves, chemical valves and aeration system valves.

3. Fill the DAF System with Clean Water

Fill the whole thing with clean water all the way up to the edge of the adjustable outlet weirs. It’s a safety and maintenance issue.

4. Adjust the Outlet Weirs

Bring them all the way up to their highest position. This allows for the greatest volume of water in the tank and is a good baseline for your first run of wastewater.

5. Check your Recycle Pumps

Make sure they’re properly oiled and aligned to eliminate vibration. This will be the heart and soul of the whole operation. Get it set right from the get go.

6. Verify Pump Rotation

The recycle pump is a comes with a 3-phase motor. Bump the motor and make sure it’s rotating in the correct direction.

7. Check Motor Rotation

The DAF system has motors for the auger and skimmer. Skimmer blades should move toward the sludge ramp. Auger should push toward the outlet. Make sure they’re rotating correctly.

8. Test Electrical and Pneumatic Devices

They should actuate when a signal is sent from the panels. Make sure they’re calibrated to close slowly and not slam shut.

9. Perform Whitewater Test

Refer to the O & M manual for the procedure for generating whitewater. When you’ve got it correct, the water coming into the DAF system will look a little like skimmed-milk. After several minutes, the whole tank should be saturated with microbubbles.

10. Check for Obstructions

Confirm that the rotating top skimmer is not obstructed. All hoses and debris should be removed from the tank.


With that said, if there’s something you’re not quite sure about, err on the side of safety and send us a note. That’s what we’re here for.

DAF System Operation & Maintenance Schedule

Like any other equipment in your facility, a DAF system absolutely must be maintained if you expect it to perform as designed. Whether you’re in charge of DAF system operation & maintenance or you’re in charge of the guys whose job it is to maintain the DAF system, here’s the list of maintenance procedures that should be performed on a daily, weekly, and monthly basis.


  • Check all control system alarms
  • Monitor effluent quality/turbidity
  • Clean air filter/regulator in pneumatic panel
  • Inspect system for leaks in pipes and pumps
  • Adjust water level to generate thick sludge layer
  • Monitor influent flow rate
  • Check and set recycle pump pressure
  • Eject sediment from drain valves
  • Check and set air flow setting in pneumatic panel
  • Check for clogging in aeration valves
  • Open and reset all bleed-off valves to clear obstructions
  • Monitor skimmer system for smooth operation and correct tension
  • Check and set chemical dosing rates (if chemically equipped)
  • Inspect chemical supply (if equipped)


  • Drain and clean DAF unit
  • Inspect strainers and filters. Replace as necessary
  • Purge plate pack using purge valves
  • Inspect and clear tanks and sumps of sediment


  • Apply anti-seize to frequently-used threaded parts
  • Grease all bearings
  • Check skimmer/auger drive oil
  • Check recycle pump oil/grease (if equipped)
  • Inspect 3rd party components as per their O&M Manuals
  • Check lamps on control panel
  • Switch to alternate pumps/motors

Do these simple tasks and you should be able to keep the system working like a charm. If for some reason something’s not working or needs replacement, give us a call. We stock all DAF System spare parts for immediate shipment.