Commercial Cleaning Chemical Dilution Guide
Dilute by dose, not by eye. A drum pump makes every batch repeatable and safe.
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The label wins. A ratio calculator can help convert instructions, but it cannot decide the correct dose. Use the product label and current SDS or product information sheet, and never combine chemicals unless the manufacturer explicitly instructs it.
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Read the instruction before calculating
A dilution calculator converts a confirmed instruction into a volume. It cannot decide which product, concentration or contact time a job requires. Start with the label and current product information. Where the product is a workplace hazardous chemical, keep the current safety data sheet available and follow the site’s risk controls.
Write down four inputs before opening the concentrate: exact product, intended surface or task, required dilution for that task, and final amount needed. Many products list several rates for light cleaning, heavy soil or another approved use. Selecting the wrong row accurately still produces the wrong solution.
What does a ratio such as 1:100 mean?
Manufacturers do not always express ratios in the same way. “One part concentrate in 100 parts finished solution” is different from “one part concentrate added to 100 parts water”. Read the wording and any worked example rather than relying on the numbers alone.
| Instruction convention | For a nominal 10 L job | Calculation |
|---|---|---|
| 1 part in 100 parts finished solution | 100 mL concentrate; add water to reach 10 L total | 10,000 mL ÷ 100 |
| 1 part concentrate to 100 parts water | 100 mL concentrate plus 10 L water | 10,000 mL water ÷ 100 |
| 20 mL per litre of water | 200 mL concentrate plus 10 L water | 20 mL × 10 |
The table illustrates the arithmetic only. It does not recommend those doses for a particular Freshway product.
Rates printed on the products themselves
The instruction that counts is the one printed for the exact product in front of you. Concentrates made for commercial work usually carry more than one rate, because the same drum is used for routine mopping and for restorative work, and the rate follows the soil rather than the brand. The six products below are stocked here, and every rate in the table is the figure published on that product’s own page.
| Product | Rate stated on the product | What that rate is for |
|---|---|---|
| Freshway Floor Cleaner 380 | 1:40 to 1:5 | Light daily mopping through to scrubbing severely soiled floors |
| Freshway Wall & Floor Cleaner Premium 382 | 1:20 by mop and bucket, 1:50 in a scrubbing machine | Hand mopping compared with an autoscrubber |
| Freshway Multi Grease Off 394 | 1:60 to 1:20 | General spray-and-wipe through to heavy grease removal |
| Freshway Heavy Duty Degreaser 395 | 1:20 for general floor washing, neat on baked-on oven grease | General floor washing compared with carbonised oven and grill deposits |
| Agar Super Force | 1:160 for light soil, 1:50 for heavy soil | Daily autoscrubber maintenance compared with heavy soil |
| Actichem Pro Neutro | Up to 1:400 | Dosing a ride-on autoscrubber |
Two things follow from that spread. A single number is never the whole instruction for a concentrate, so a rate carried across from another product is not transferable: the 1:400 that suits an autoscrubber would under-dose a mop bucket, and the 1:5 lifted from a stripping job would waste product on a daily mop. Where a product states one rate only, that one rate is the instruction.
Calculate from the required finished volume
When the instruction defines concentrate as a fraction of the finished solution, convert the final volume into the same unit and divide by the ratio denominator.
concentrate mL = finished solution mL ÷ dilution denominator
For 750 mL of finished solution at 1:50 under that convention, 750 ÷ 50 gives 15 mL of concentrate. Add water until the total reaches 750 mL. For 5 L at 1:20, convert 5 L to 5,000 mL: 5,000 ÷ 20 gives 250 mL.
Small concentrate volumes can be difficult to measure consistently with an ungraduated cap. Use a suitable dedicated measure or an approved dispensing system. Do not estimate by eye, and do not return unused diluted product to the concentrate container.
Use a controlled mixing sequence
- Confirm the product, task, surface and required rate on the label.
- Review the SDS and workplace procedure; apply the required controls and PPE.
- Select a clean, compatible and correctly labelled container.
- Measure with a dedicated device or calibrated dispenser.
- Add materials in the manufacturer’s stated order and minimise splashing or mist.
- Confirm the final volume and label the prepared solution as required.
- Store, use or dispose of the remainder according to the label, SDS and site procedure.
Never combine chemicals unless the manufacturer explicitly instructs that combination. Hazardous chemicals can react and create additional risks. An odour or colour change is not a safe compatibility test.
What a concentrate costs per litre of use
A drum price only means something once it is converted into the cost of the solution you actually mop with, and the conversion is short.
Worked example, using the prices listed here. Freshway Floor Cleaner 380 is $29 for 5 L. At the label’s 1:40 light-soil rate – read as one part concentrate topped up to 40 parts of finished solution – that drum makes about 200 L, because 5 L × 40 = 200 L. Dividing $29 by 200 L puts the concentrate at roughly $0.15 per litre of ready-to-use solution. A ready-to-use product at $30 for 5 L works out at $6.00 per litre. On those two numbers the concentrate is around forty times cheaper for each litre of working solution.
That is a model, not a quotation: substitute your own price, pack size and rate before reusing it. Two limits belong with it. The saving assumes the rate on the label is the rate the job actually needs, because mixing stronger than the label is both wasteful and more likely to leave the residue described below. And the drum price is not the only cost of the drum, since measuring 125 mL accurately at every refill takes a marked measure plus the seconds and the discipline to use it, while a ready-to-use bottle asks for neither.
The limit of the model is the rate itself. A concentrate bought for 1:40 work is economical at 1:40 and uneconomical at 1:5, so the price per litre is a consequence of the dilution, not a property of the bottle.
Why stronger solution can perform worse
Over-concentration may increase residue, rinsing, surface damage, exposure and cost. Residue can attract new soil or leave a floor tacky. Under-concentration may fail to remove the intended soil. The correct rate balances the product’s approved use with the actual task.
For sanitisers and disinfectants, concentration is only one part of the method. Pre-cleaning, coverage, contact time, temperature, rinsing and surface compatibility may also be specified. Do not shorten contact time by increasing concentration unless the product instructions expressly permit that alternative.
Dispensing systems need their own verification
A wall-mounted or bottle-fill dispenser can reduce manual measuring, but its output still needs checking. Wrong tips, pressure variation, blocked inlets, empty concentrate and unauthorised adjustment can change the result. Follow the supplier’s calibration and maintenance process and record checks at a frequency appropriate to the risk.
If workers prepare several products, use clear separation and identification so a bottle cannot be connected to the wrong concentrate. Keep current labels legible. Replace damaged secondary containers rather than transferring solution into an unmarked bottle.
Control the chemical store as part of dilution
Keep the hazardous chemical register and current SDS documents accessible where required. Store incompatible products according to their information, control access, and keep measuring devices with the product or system they serve. Safe Work Australia notes that an SDS includes handling, storage, first aid, spill response and disposal information; it is more than an emergency document.
Browse Freshway’s commercial cleaning chemicals, then use the instructions for the exact SKU and intended application. Similar product names or colours do not establish the same dilution.
Common dilution errors to prevent
- Using a rate remembered from a different product.
- Confusing final solution volume with the amount of water.
- Mixing a full container when the shift needs only a small amount.
- Measuring concentrate with an unmarked cap or cup.
- Leaving a secondary bottle unlabelled.
- Assuming a dispenser remains accurate without inspection.
- Adding concentrate to leftover solution of unknown strength.
Frequently asked questions
Can I reuse an unlabelled spray bottle?
No. Use a suitable container labelled according to the product and workplace requirements. An unknown bottle creates identification, exposure and accidental-mixing risks.
Is the SDS the same as directions for use?
No. The SDS communicates hazards, handling and emergency information. The label or product information supplies task-specific directions. Use both where applicable.
Should diluted solution be kept overnight?
Only if the product instructions and workplace procedure allow it. Stability and labelling requirements vary. Prepare an amount matched to the task when the directions do not support storage.
How do you make a 1 to 40 dilution?
Measure one part concentrate and add water until the total reaches forty parts. In a 5 L bucket, 5,000 mL divided by 40 is 125 mL, so 125 mL of concentrate topped up to the 5 L mark gives a 1:40 solution. The same arithmetic answers the usual “what is 125 mL in 5 L” question, because both describe one ratio at different scales.
Which cleaning chemicals should never be mixed together?
No general rule makes mixing two products safe, so the only reliable answer is that they should be combined when the instructions for that task say so, and not otherwise. Products in this range carry the warning on the product page itself: a washroom cleaner states plainly that it must not be mixed with bleach, disinfectants or other strong chemicals, and another states not to mix it with other cleaning chemicals at all. Each product’s safety data sheet lists the substances and conditions it is incompatible with, and that is where a proposed combination has to be checked. Adding concentrate to leftover solution of unknown strength is the same problem in reverse, because it destroys the information you would need to judge the result.
References
- Safe Work Australia — Safety data sheets.
- Safe Work Australia — Hazardous chemicals: risks and controls.
- Australian Government Department of Health — Safe handling of chemicals.
Part of the cleaning chemicals guide — read it alongside the dilution method and the brand range guides.
