No matter the size or style, the main steps—inspect, fill, and pump—are always the same. Following these steps in order helps prevent leaks, callbacks, and costly equipment damage—while ensuring our customers get exactly the service they expect.
Step 1: Verify Unit Number and Sign Date Sticker
When you arrive onsite, start by checking the work order or route sheet to confirm the unit number matches the system you’re servicing. This is critical, since many sites have multiple Pro Flush units. Once verified, clearly sign and date the service sticker in the correct boxes. Accurate dates matter—customers may request a reservice if the information is incorrect.
Step 2: Inspect for Leaks
Once the sticker is signed, a quick leak check can save a big problem later. Inspect inside the unit, under the trailer, and around the ejector pit for water or waste. If you spot a leak, contact Pro-Flush maintenance right away. If everything checks out, continue by inspecting the water and waste tank levels.
The water tank is typically identified by the water hose exiting the bottom, while the waste tank can be identified by the white PVC piping connected to it. When inspecting tank levels, ensure the water and waste levels balance out, since most water used in the trailer flows into the waste tank. For example, if the water tank is one-third full, the waste tank should be approximately two-thirds full. If the levels do not balance, a leak is likely present.
If you suspect a leak, take a moment to trace its source. When the cause isn’t clear or you can’t resolve it, calling the Pro Flush team first helps prevent bigger issues and ensures the service is done right. Do not attempt repairs beyond your scope.
Step 3: Pump the Waste Tank
Once you’ve confirmed there are no leaks, begin evacuating the waste tank. Unravel the hose from the truck and engage the PTO. With the PTO running, locate the dump valve on the side of the unit and remove the 2-inch cap. Position the vacuum hose beneath the valve to capture any residual waste and prevent spills.
Once the cap is removed, secure the hose to the cam fitting so waste can flow from the holding tank into the truck. As the tank nears empty, the hose will begin to move aggressively on the ground. This indicates pumping is nearly complete. With the PTO still engaged, carefully disconnect the hose and hold it beneath the valve to catch any remaining waste. Clean up any spills, then close and recap the valve, rewind the hose, and disengage the PTO.
Step 4: Fill Fresh Water
With the waste tank emptied, begin filling the freshwater tank. Locate the 1½-inch cam lock fitting on the outside of the unit. This fitting connects to most Pro-Flush water truck hoses, though route trucks with smaller hoses may require an adapter. If an adapter isn’t available, the water tank can also be filled by inserting the hose into the top of the tank.
Once the hose is secured, open the freshwater valve and monitor the tank as it fills. Fill the tank only halfway up the tapered portion. The freshwater and wastewater tanks are the same size, and overfilling the freshwater tank can cause the waste tank to overflow over time due to limited space for solids. Even if everything looks fine at first, this can lead to overflow later.
It’s important to always fill the freshwater tank to the correct level. Filling it below the proper level can create confusion for the next driver and may suggest a leak where none exists. If there isn’t enough water on the truck to reach the correct level, document it on your paperwork or tablet. Once the tank is filled, close the hose valves, wind up the hose, and move on to the next step.
Step 5: Prime, Flush & Blue
After servicing the tanks, enter the trailer and run both hot and cold water at each faucet. Flush each toilet, then add 16 ounces of blue to one toilet while it is flushing. Never add blue before flushing, as this can cause splashing and create a mess.
Once finished inside, return to the Pro-Flush box and listen for the water pump as the toilets refill. When refilling is complete, the pump will shut off, indicating proper pressure in the system. If the pump continues to run, notify the Pro-Flush maintenance team immediately. Do not attempt adjustments or repairs, maintenance will guide next steps. During winter months, also check the space heater inside the box to ensure it is operating correctly. If the box is warm, do not adjust the heater, as it is preset for the system’s power. Report any suspected heater issues to the Pro-Flush maintenance team before leaving the site.
Finally, perform one last inspection inside and around the box to confirm there are no leaks. If everything checks out, close and secure the box, complete the required paperwork, and proceed to the next stop. A complete, accurate service protects our equipment, supports our customers, and keeps our fleet running strong.