Food Sanitiser Checks NZ: Dilution, Contact Time and Records

A tick beside “sanitiser checked” is useful only when everyone knows what was checked. The right concentration depends on the actual chemical, its intended use and the manufacturer’s directions. A reading copied from a different product, an unsuitable test strip or a quick spray-and-wipe routine can create misleading reassurance.

This guide helps New Zealand cafés, home-based operators and food manufacturers turn chemical instructions into a practical point-of-use check. It focuses on food-contact surface sanitising. It does not provide a universal dilution recipe, recommend a chemical brand or replace the instructions for your product, equipment and registered food-safety system.

Start with the current product and intended use

Keep the product identity and current directions available at the place where the solution is prepared. Check that the container in use matches the instruction, including the formulation or concentration. A familiar product name is not enough if a replacement product has different directions. Ask the supplier to resolve unclear or conflicting instructions before approving the method.

The current MPI Simply Safe & Suitable plan, hosted by Waitaki District Council distinguishes cleaning from sanitising and requires users of that template to follow manufacturers’ chemical instructions. Its cleaning card also asks the business to demonstrate cleaning procedures and safe chemical use. Other operators should check their applicable plan or programme rather than treating this article as a replacement for it.

Chemical directions may distinguish food-contact surfaces from floors, footbaths or other applications. For example, the manufacturer’s Bac-Stop directions contain different use categories and conditions. This illustrates why a number from one line of a product page cannot safely become a site-wide rule. This article deliberately does not reproduce a working dilution from that example.

Write the complete task, not just the dilution

Create a short instruction for the specific surface or equipment. Identify who prepares the solution, what measuring or dosing equipment is used and which water or solution conditions the instructions require. If an automatic dispenser is used, establish how the output is checked; the presence of a dispenser is not itself a concentration result.

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Do not mix cleaning chemicals or improvise a stronger solution to compensate for poor cleaning. Keep food and food-contact packaging protected during chemical work. Use the product’s safety instructions and required protective measures. A safety data sheet supports safe handling, but do not assume it contains the complete food-contact application method.

Check cleaning before relying on sanitising

The current template explains that sanitising follows cleaning. A concentration reading from the bucket does not show that grease, food deposits or soil were removed from the equipment. Build the pre-cleaning check into the sequence so staff do not measure a good solution and then apply it to an inadequately cleaned surface.

Consider access as well as appearance. A removable guard, underside, seal or awkward joint may require an equipment-specific method. Follow competent equipment instructions when disassembly is necessary. Check that the cleaning method reaches the relevant surfaces without creating a new hazard. A small food business does not need an elaborate form for every action, but it does need a method staff can perform reliably.

Cleaning for allergen control asks a different question from measuring sanitiser concentration. A chemical reading does not prove allergen removal. See our guide to allergen cleaning validation for that separate evidence task.

Choose a compatible test and follow its instructions

Confirm the active chemistry and ask the chemical supplier which test method is suitable for the prepared solution and required range. “Sanitiser strips” is not a complete specification. A test for one parameter is not automatically suitable for another chemical, and the scale needs to support the decision you are making.

The manufacturer’s QUANTOFIX QUAT product information identifies a specific QUAT parameter and a scale expressed against benzalkonium chloride. That is an example of a defined method, not proof that this particular strip works for every sanitiser. Confirm compatibility with your product rather than assuming every quaternary compound or mixture gives an interchangeable result.

• Use the method’s current instructions for sampling, immersion, reading time and result interpretation. Do not borrow the timing from another kit.
• Check the correct container, lot and expiry information, and required storage conditions. Avoid touching the test area or contaminating unused strips.
• Record the result in the units used by the method and task instruction. A colour description alone may not show whether the solution met the required target.
• If the result is outside the readable range, ambiguous or inconsistent, follow the method’s instructions or seek supplier advice. Do not record the nearest attractive number.

Record a decision that another person can follow

The structure below is an AFVA recommendation for a useful concentration check. It is not a claim that every business must use this precise daily form. Set check and replacement frequencies from the actual product instructions, the applicable food-safety system and the conditions of use.

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Respond to a failure before resuming the task

A low, high or unreliable result needs a response consistent with the approved method. Stop relying on the unconfirmed solution, identify the cause and correct it safely. This could involve the preparation method, dispenser setting, product identity or test method. Follow supplier directions when remaking or disposing of a solution; do not add concentrate or water by guesswork.

Repeat the relevant check and document the result before relying on the corrected method. Also consider work completed since the last acceptable check. Identify potentially affected surfaces or food, protect them from use or release where needed and follow the site’s non-conforming-product or incident procedure. A successful new bucket reading does not retrospectively prove earlier food was protected.

Worked example: a replacement chemical arrives

Hypothetical example: A small sauce manufacturer receives a different surface sanitiser after its usual product is unavailable. The shift supervisor notices that the wall instruction and test-strip container still identify the previous chemistry. Rather than using the old dilution, the business obtains the new product directions and confirms the intended use, measurement method and test compatibility with the supplier.

The supervisor updates the task instruction, trains the relevant staff and records a satisfactory demonstration and check. The old instruction is removed from use. If the change had already been used in production, the business would also assess the period of use and any possible exposure. The example shows a change-control decision; it does not establish a suitable chemical or concentration for anyone else’s process.

Check the whole method during a staff demonstration

Ask one person to prepare and check the solution using the normal equipment. Watch how they identify the product, measure it, select the test and interpret the result. Then observe application to a cleaned surface and the final steps before reuse. Use our food-safety training guide to plan a practical competence check rather than relying only on a signed attendance sheet.

• The product and task instruction match.
• The preparation and test methods are suitable and current.
• The surface is cleaned before sanitising.
• Contact time and any final rinse or drain are followed.
• An unacceptable result triggers a clear corrective action.
• Records and instructions are updated when products, equipment or methods change.

Frequently asked questions

Need help making chemical checks practical?

AFVA’s food safety and quality consulting support includes reviewing cleaning systems, procedures, records and staff practices. We can help identify gaps between the supplier’s directions and the method used at your site. Agree the scope for Auckland onsite work or appropriate remote document review elsewhere in New Zealand. Contact AFVA with your current cleaning procedure and product information.