When a wash stops performing after a product change, the chemical is usually fine. What changed was the concentration actually reaching the vehicle.
Every operator has seen it. The machine has run well for months. A cheaper detergent comes in, and within a week the foam is thin, panels come out patchy, and if it goes on long enough, lines start to block.
The instinct is to blame the batch. But in most cases the product is not defective — it simply does not belong on that machine.
Our systems dose through a Venturi injector. Water passing through a constriction creates negative pressure, which draws concentrate up from the drum and mixes it into the stream. It is a mature design: stable, no electrical dosing pump, very little to fail.
It also has one characteristic that has to be understood:
Which means: same machine, same setting, a product with different viscosity — and the concentration arriving at the vehicle has already changed. Nothing was adjusted. Nothing is broken. The number simply drifted.
What matters is not the dilution printed on the drum. It is the product of three things:
Incoming pressure differs site to site. Output volume differs by machine design. A touchless system needs high water volume to clean without contact; a brush system uses far less. The same product placed in both behaves nothing alike.
The variable most often ignored. A Venturi draws thinner liquids faster and thicker ones slower. Commercial detergents vary widely here, so substituting a product with different rheology moves the draw rate directly.
Travel speed, spray duration and dwell time determine how long the chemistry has to act. Fast cycles need fast-acting formulations. Slow cycles are a different formulation problem.
These three are coupled. No single product can be correct across every machine — not because suppliers are unwilling, but because the physics does not allow it.
Concentration runs high, the rinse stage cannot clear it, and what remains dries into marks on the panel. This is where customer complaints come from.
Concentration runs low. Chemical was sprayed, water was used, cycle time was spent, and the soil is still there. Cost incurred, result absent.
The expensive one. Incompatible or over-concentrated product deposits inside lines and nozzles. Mild cases show as uneven spray. Severe cases stop the machine.
Paiject Industries is a chemical manufacturer — formulation has been the core business since 1989. The equipment and the chemistry are designed as one system rather than sourced separately and hoped to fit.
Dilution is not set on site. Formulations are built against the target machine's water volume, pressure and cycle timing. At commissioning our technician calibrates draw rate against the site's real water conditions, and re-measures it on the service schedule. Operators connect the drum and press start. That is the whole procedure.
| Touchless (LD-360) | Brush | |
|---|---|---|
| Contact | None — no component touches the vehicle | Brush contact, with a lubricating film laid by the chemistry |
| Chemistry | Three-step: pre-wash, touchless detergent, titanium protectant | Single-step: microcapsule coating shampoo |
| Water use | Higher — volume substitutes for mechanical action | Noticeably lower |
| Cycle time | Longer | Shorter |
| Suited to | New-vehicle prep, delivery centers, premium and imported vehicles | Fuel stations, express wash, high-volume sites |
| Commercial model | Higher ticket, quality-led | Lower ticket, throughput-led |
This is also why we ask about daily volume and average ticket before quoting anything. Specifying the wrong system costs more than choosing the wrong supplier.
A calibrated formulation drifts if nobody maintains it. Pressure changes, nozzles wear, brushes consume. Calibration at commissioning does not mean the number is still right a year later.
That is why draw-rate measurement is part of scheduled service rather than a one-time step at handover — and why we prefer to supply equipment and chemistry together rather than as separate transactions.
Already running other equipment? Send us its pressure, flow and cycle figures — matching is a technical exercise, and we can start from what you have.