A practical guide to choosing the right chemical application method — and the Lafferty systems built for each.
If your facility relies on washdowns to stay clean and compliant, the way you apply chemical matters just as much as the chemical itself. The two most common application methods are foam and spray, and choosing the right one affects cleaning quality, chemical usage, labour time and safety.
As an authorised Australian supplier of Lafferty Equipment, Precision Flow Solutions helps facilities across food processing, agriculture and industry choose the right approach. This guide explains how each method works, where each performs best, and which Lafferty system suits the job.
Short answer: Use foam to clean — it clings to vertical and overhead surfaces for longer dwell time and better soil removal. Use spray to sanitise and rinse — it lays down a fast, even, accurately diluted coat. Most facilities use both, and Lafferty’s multifunction stations are built to do exactly that.
How Foam Cleaning Works
Foam application mixes diluted chemical with air to create a thick, clinging foam that is projected onto a surface. Because the foam sticks to vertical and overhead surfaces rather than running straight off, the chemical stays in contact with the surface for much longer.
That extended contact time, often called dwell time, is what makes foam so effective. Cleaning and sanitising chemicals need time — often several minutes — to break down soils and kill pathogens, and foam holds the active ingredients exactly where they are needed.
This is the principle behind Lafferty’s range of foamers. From the compact LV and LC Foamers through to the high-volume HV and Ultimate Foamers, each water-driven unit projects dense, clinging foam several metres, letting operators coat large areas and hard-to-reach spots quickly. For production lines, Lafferty’s Conveyor-Mate foam systems apply foam automatically as product passes.
Foam is the better choice when you need to:
- Clean large vertical surfaces such as walls, tanks and equipment
- Maximise chemical dwell time for tough soils or sanitising
- Cover a large area quickly with visible, even coverage
- Maintain biosecurity through foam barriers at entry points
- Reduce chemical run-off and waste on sloped or upright surfaces
How Spray Cleaning Works
Spray application projects diluted chemical as a liquid, usually in a fan pattern, to wet a surface quickly and evenly. Spraying is fast and well suited to surfaces where dwell time is less critical, or where the goal is to rinse, sanitise or apply a light, even coat of solution.
Spray is often the preferred method for the sanitising step after cleaning, where a consistent, accurately diluted solution needs to reach every part of a surface without the bulk of foam. Lafferty’s sanitising range is built for exactly this stage — including the 517 and 315 Sanitizers, Entry Way Sanitisers for biosecurity points, and Spray All applicators for fast, even coverage.
Spray is the better choice when you need to:
- Apply sanitiser quickly and evenly across a clean surface
- Wet flat or horizontal surfaces such as floors and benches
- Rinse or apply solution where long dwell time is not required
- Treat surfaces where foam would be difficult to rinse away
- Move quickly between areas with minimal set-up
Foam vs Spray at a Glance
| Consideration | Foam | Spray |
| Dwell time | Long — foam clings to surfaces | Short — liquid runs off faster |
| Best surfaces | Vertical, overhead, large areas | Flat, horizontal, quick coverage |
| Visibility of coverage | High — easy to see what is treated | Lower — harder to see coverage |
| Typical use | Cleaning and biosecurity | Sanitising and rinsing |
| Lafferty systems | LV, LC, HV & Ultimate Foamers; Conveyor-Mate | 517 & 315 Sanitizers; Spray All; Entry Way |
In Most Facilities, the Answer Is Both
For many operations the most effective cleaning program uses foam and spray together. A typical sequence is to foam the surface to clean and loosen soils, rinse, then apply a sanitiser by spray. Each method does the job it is best suited to, and the result is a faster, more thorough and more compliant clean.
This is exactly what Lafferty’s multifunction Hose Drop Stations are built for. A single wall-mounted station — such as the Ultimate Foam Hose Drop Station — lets an operator foam, sanitise and rinse from one unit by simply switching the dial. It is why these stations are so popular in food processing, commercial kitchens and breweries: one piece of equipment covers the whole washdown, reducing clutter and simplifying staff training.
The Water-Driven Advantage
Whichever method you choose, accurate dilution is critical. Too weak and the chemical will not clean or sanitise properly. Too strong and you waste money and risk damaging surfaces or leaving residue.
Every Lafferty system is built on water-driven venturi technology, using water pressure to draw and dilute concentrate at a fixed, repeatable ratio. They operate on standard mains pressure — typically 25 to 100 PSI (1.7 to 7 bar) — and require no electricity, which makes them ideal for wet washdown areas and food-safe environments. Lafferty’s colour-coded metering tips make it simple to set and change dilution ratios with confidence.
Because Lafferty systems draw concentrate directly from the original container, they also reduce manual handling, which improves safety and lowers the risk of spills and exposure for your team.
Choosing the Right Lafferty System for Your Facility
The right choice depends on your surfaces, your chemicals, your water pressure and how your team works. That is where it helps to talk to a specialist.
Precision Flow Solutions supplies the full range of Lafferty foaming and sanitising systems, from compact hose-end foamers to multifunction Hose Drop Stations and central distribution systems. We hold local stock, help you select the right equipment, and support you through installation and beyond.
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Frequently Asked Questions
What is the difference between foam and spray cleaning?
Foam cleaning mixes diluted chemical with air so it clings to surfaces, extending contact (dwell) time for better soil removal — ideal for vertical and overhead areas. Spray cleaning applies the chemical as a liquid in a fan pattern for fast, even wetting — ideal for sanitising and rinsing flat surfaces.
Is foam or spray better for sanitising?
Spray is usually preferred for the sanitising step. After cleaning and rinsing, a spray lays down a consistent, accurately diluted coat of sanitiser across the whole surface without the bulk of foam. Foam is better suited to the initial cleaning step. Lafferty’s 517 and 315 Sanitizers are designed for this stage.
Can one Lafferty machine do both foam and spray?
Yes. Lafferty’s multifunction Hose Drop Stations — such as the Ultimate Foam Hose Drop Station — foam, sanitise and rinse from a single wall-mounted, water-driven unit, which reduces equipment clutter and simplifies staff training.
Do Lafferty foam and spray systems need electricity?
No. Lafferty’s water-driven venturi systems use mains water pressure — typically 25 to 100 PSI (1.7 to 7 bar) — to draw and dilute concentrate, so they need no electricity. That makes them ideal for wet washdown and food-safe areas.
Which method uses less chemical?
Foam reduces run-off on vertical and upright surfaces, while spray is efficient for fast, even wetting of flat areas. Either way, Lafferty’s colour-coded metering tips deliver accurate, repeatable dilution that keeps chemical use — and cost — under control.