Who changed the dose? Controlling chemical settings across sites
By Doza · November 4, 2026
If the shine looks weak, someone turns it up. If the bill looks high, someone else turns it down. With no record of either, your chemical cost becomes a mystery. Here's how to keep control of it.
How dosing drifts
Nobody means any harm. A site manager wants a better finish, a technician adjusts a setting on a service visit, or a new hire copies what they saw at another site. On a tip or a valve, each of those changes is invisible. You find out from the chemical bill, weeks later, with no way to tell which site changed or when.
Keeping control comes down to three questions: who can change a dose, can it be done at the machine, and who did it last?
1. Who can change a dose
Give each person the access their job needs, and no more. In DozaLink, that's four roles:
| Role | Can |
|---|---|
| Viewer | See devices, activity and reports |
| Operator | Also run pumps, link devices, calibrate, change doses and update stock |
| Admin | Also change pump direction, lock local controls, update firmware, and manage locations and team |
| Owner | Admin access plus billing |
Roles work alongside locations. When you invite someone, you choose the sites they can see, so a manager at one site can do their job without seeing or changing the others. A finance lead can have Viewer access to every site, to read the numbers without being able to touch a pump.
2. Can it be changed at the machine
Permissions on a website don't mean much if anyone in the equipment room can change the setting on the unit itself. Doza has a setup page at the device for installing and for sites without internet. An admin can lock those local controls, so changes go through DozaLink, where they're limited by role and recorded.
3. Who did it last
An audit log turns "someone must have changed it" into a name and a time. DozaLink's lists every change to devices, calibration, chemicals, locations, organization settings and team access. Open an entry to see the values before and after.
When the numbers move, you can look in order at:
- Home and Analytics: which site, chemical or device changed, and when it started.
- Activity: the individual doses around that time.
- Audit Log: whether someone changed a setting at that point, and what it was before.
A simple starting policy
- Decide the dose for each chemical once, and write down why.
- Give site managers Viewer access, or Operator if they really do adjust their own doses.
- Keep Admin to the one or two people who answer for chemical cost.
- Lock local controls at each site once it's installed and calibrated.
- Look at the audit log whenever cost per car moves, and on a regular schedule.
You can click through these screens in the live demo, or read how to set up locations and team in the Operation Manual.