Holdback is a safety feature that ensures the Mixmate doesn't run out of carrier water before it finishes rinsing the inductor and the lines. By "holding back" a portion of the water, the system guarantees there is enough liquid left to flush the manifold and push all the chemical to its final destination.
This is the amount of carrier water the system reserves for the very end of the mix.
The Rule: If the system reaches your "Minimum Holdback" limit and products are still being added, the carrier flow will pause until the products are finished.
The Result: You avoid a "dry pipe" scenario where a mix is finished but the lines are still full of chemical.
[!IMPORTANT]
"Carrier May Run Out" Message: If you see this warning, the Mixmate has calculated that the chemical volume is so large that it must stop the carrier flow early. It will run the products until they are complete, then use the remaining "Holdback" water to finish the mix.
This setting controls how far the carrier valve opens while products are being inducted. It is a balance between total flow speed and induction suction.
The Setting (Default: 50): This is the target percentage for the carrier valve while products are moving. A setting of 50 allows for a high carrier flow rate while still maintaining enough suction to pull product through the inductor.
The Mixmate uses Automatic Throttling to optimize the mix. The system dynamically adjusts the carrier valve within a safe operating window:
The Operating Range: The system will throttle the valve between a minimum of 20 (to ensure some carrier is always flowing with the product) and the maximum position found during your Carrier Pump Profiling wizard.
Suction Priority: If product induction is slow, the system throttles the valve down toward 20 to increase vacuum/suction.
Flow Balancing: The system constantly adjusts to ensure carrier flow doesn't "outrun" the chemical induction, preserving your holdback water.
System Protection: By capping the opening at the "Pump Profile Maximum," the software ensures the pump operates within its physical capabilities, preventing surging or cavitation.
| Scenario | Total Carrier | Total Product | Holdback Setting | Result |
| Example 1 | 1000 gal | 200 gal | 50 gal | Carrier stops at 950 gal if products are still running. |
| Example 2 | 100 gal | 20 gal | 100 gal | No carrier runs until all products are finished. |
Start: Mixmate runs carrier and products simultaneously.
Monitoring: It constantly checks: Total Carrier Remaining vs. Minimum Holdback.
The Pause: If Carrier Remaining = Holdback, the carrier valve closes until the products are finished.
The Finish: Once products are 100% done, the carrier valve re-opens to use the "Holdback" water for the final rinse and flush of the mix.