Liquid vs packet deodorizer on a summer route: what are you dosing?

I dose with liquid concentrate on my summer route for the control. A standard unit with normal weekday use gets a standard shot from the pump, but I can double-pump a unit that's getting heavy traffic or add a shot to the holding tank of a deluxe unit if the sink is seeing a lot of handwashing. The mess is real, but a funnel and a steady hand keep it off the truck.

I keep a box of packets on the truck for specific cases. They're perfect for a fresh delivery where I know the service frequency will be weekly and the use is predictable. They're also my backup if a liquid drum runs dry mid-route.

For units that sour faster, it's always about use and placement. A unit in full sun with twenty guys on a concrete pour needs more deodorizer and, honestly, a mid-week check if the contract allows it. I note those units on my sheet. The key is the formaldehyde-free deodorizer; it breaks down waste differently and our dump station won't take the old formaldehyde stuff anymore. In this heat, you have to hit the bacterial action hard from the first service.

I use liquid concentrate for the flexibility, but the pump calibration is the detail that matters. The service truck's pump must be calibrated monthly to deliver the correct dose, and an inspector can check that the hauler's permit requires this record. A deluxe unit with a sink produces more gray water, which dilutes the deodorizer faster, so a standard dose may not be enough. For units that sour quickly, the problem is often a combination of high use and a compromised vent stack that isn't allowing gases to escape properly, which no amount of deodorizer will fully fix.