Kitchen Sanitiser Concentration Test Strips

To know whether kitchen sanitiser is at the correct strength, test it with concentration test strips matched to your specific product, comparing the strip colour against the manufacturer's chart to confirm the parts-per-million reading falls within the recommended range. Strength alone is not enough: the sanitiser must also be mixed to the maker's dilution, left on the surface for the full contact time, and each verification should be recorded. Test strips turn an invisible property into a check anyone on the team can perform. Standard 3.2.2 of the Food Standards Code requires food contact surfaces to be sanitised effectively, and a sanitiser that is too weak simply will not reduce bacteria to a safe level. Too strong is also a problem, wasting product and risking chemical residue on food surfaces. Getting the concentration right, every time, is what makes sanitising reliable rather than a guess. Why does sanitiser concentration matter? Chemical sanitisers only work within a specific concentration range. Below that range they fail to kill enough bacteria, leaving surfaces unsafe even though they look treated. Above it, the excess offers no extra benefit, costs more and can leave residues. Concentration is measured in parts per million (ppm), and different sanitiser types have different target ranges set by their manufacturers. The catch is that you cannot see, smell or feel whether a diluted sanitiser is at the right strength. A solution that looks identical could be half the required concentration because of a measuring error or because it has degraded over time. That is exactly why objective testing matters. How do you use sanitiser test strips? Test strips are the simplest way to verify concentration in a commercial kitchen. Each strip type is matched to a sanitiser chemistry, so use strips designed for your product. The basic method is: Mix the sanitiser to the manufacturer's stated dilution. Dip a fresh strip into the solution for the time stated on the strip packaging. Remove it and compare the colour that develops against the reference chart on the container. Read off the ppm value and confirm it sits within the recommended range. If it reads low or high, adjust the mix and test again before use. Test when you make up a fresh batch, and re-test through the day because sanitiser degrades with use, heat and contamination from soil. A bucket mixed hours ago and topped up repeatedly may no longer be effective. Why must you follow the manufacturer's instructions? Every sanitiser is formulated differently, so the label is the authority on how to use it. The FSANZ cleaning and sanitising guidance stresses using sanitisers according to directions. The instructions tell you three things that all matter: Dilution: The exact ratio of product to water needed to reach the target concentration. Contact time: How long the sanitiser must stay wet on the surface to work. Suitability: Whether the product is approved for food contact surfaces and any rinse requirements. Guessing the dilution, or using a splash more to be safe, undermines the whole process. Follow the label precisely and verify the result with a strip. Check What to confirm How Concentration Within the recommended ppm range Matched test strip vs chart Dilution Correct product-to-water ratio Follow manufacturer instructions Contact time Surface stays wet long enough Timer or process step Verification Result recorded Chemical verification log Why is contact time as important as strength? Correct concentration only works if the sanitiser stays on the surface long enough to act. Every sanitiser has a required contact time during which the surface must remain visibly wet. Wiping it off immediately, or spraying and drying straight away, cuts that time short and leaves bacteria alive even when the concentration was perfect. Where possible, let sanitised surfaces air dry so the full contact time is achieved. What dilution errors should you watch for? Most concentration failures come from simple, avoidable mistakes: Eyeballing the mix instead of measuring product and water accurately. Topping up a used bucket with more water but no more product, which dilutes it below strength. Reusing an old solution that has degraded through the shift. Hot water damage, where water that is too hot breaks down some sanitiser chemistries. Contamination, where soil in the bucket consumes the active sanitiser. Using a dosing system or pre-measured sachets removes much of the human error, but a test strip is still the proof that the mix is right. Why record your verification checks? Testing without recording leaves you with no evidence. A written verification log shows an Environmental Health Officer (EHO) that your sanitiser is routinely checked, and it helps you spot patterns such as a dispenser drifting out of calibration. A digital chemical verification and corrective action record lets staff log the ppm reading, note the batch and flag any out-of-range result for action. Linking these checks to a structured cleaning schedule means verification happens as part of the routine rather than being forgotten, and keeping staff training records current ensures everyone knows how to test correctly. For groups, multi-venue oversight confirms every site verifies its sanitiser the same way. For broader guidance on chemical safety and food business hygiene, the FSANZ website is the authoritative Australian source. Understanding the ppm ranges for common Australian kitchen sanitisers Test strips only mean something if you know the target range your reading should fall inside, and that range changes with the sanitiser chemistry you are using. The three families of sanitiser found in most Australian commercial kitchens each have their own effective concentration window, their own strip type and their own quirks. Always treat the manufacturer's label as the final word, because formulations vary, but the general patterns below explain why using the wrong strip or the wrong target leads to false confidence. Chlorine-based sanitisers (sodium hypochlorite): Fast-acting and inexpensive, these are commonly used at a target in the region of 100 to 200 ppm for food contact surfaces, verified with chlorine test strips. They are strongly affected by organic soil and by water temperature, so a bucket used to wipe down greasy benches loses strength quickly. Chlorine also degrades in light and heat, so a solution made up in the morning may read far lower by mid-afternoon. Quaternary ammonium compounds (quats): Popular because they are stable, low-odour and leave a residual film that keeps working, quats typically target a higher ppm band, often around 200 ppm, and need quat-specific strips. Water hardness can interfere with quats, so venues in hard-water areas should verify carefully rather than assume the dilution ratio alone delivers the right strength. Peroxide and blended sanitisers: Used in some settings for their rinse-free convenience and lower residue, these require the matching strip supplied or specified by the manufacturer, as a chlorine or quat strip will not read them correctly. The single most important point is that a strip designed for one chemistry cannot verify another. Dipping a chlorine strip into a quat solution gives a meaningless colour, yet it is an easy mistake when a kitchen switches suppliers or runs two products side by side. Store each strip type with its matching sanitiser, label the buckets clearly, and note the product and target range on your cleaning schedule so whoever mixes the next batch knows exactly what to aim for. When a reading lands outside the range, remake the solution rather than trying to correct it by adding a dash more concentrate, and log the check so a drifting dispenser or a degrading product is caught early through your verification records . Frequently asked questions How often should I test kitchen sanitiser concentration? Test every fresh batch and re-test periodically through the shift, because sanitiser weakens with use, heat and contamination. High-use stations may need checking several times a day. Can I tell sanitiser strength without test strips? No. Concentration is invisible, so you cannot judge it by sight, smell or feel. Test strips matched to your product are the practical way to confirm the ppm is within range. What happens if sanitiser is too concentrated? Over-concentration wastes product and can leave chemical residue on food contact surfaces, which may require rinsing. It offers no extra safety benefit, so mix to the recommended dilution rather than adding more. Do I have to keep sanitiser test records? Records are not always mandated in the same way for every business, but they are strong evidence of due diligence under Standard 3.2.2 and are exactly what an EHO looks for. Digital logs make them quick to complete and retrieve. Can I use the same test strips for different sanitisers? No. Test strips are chemistry-specific, so chlorine strips only read chlorine solutions and quat strips only read quaternary ammonium solutions. Using the wrong strip gives a false reading and can leave you believing a weak solution is correct. Always match the strip to the sanitiser product and its stated ppm range. Verifying sanitiser strength is only useful if the reading is captured and acted on. FoodSafety HQ lets your team record every concentration check, contact time and corrective action from a phone, so chemical verification becomes a routine, audit-ready habit. See how chemical verification records work or start a free trial from our pricing page .