“Ready-to-use or concentrate?” is an organisational question, not a matter of preference. An undiluted spray is ideal for small surfaces and quick interventions; a concentrate becomes more efficient on large surfaces, where cost per m² and storage volume matter. Here are the criteria and calculations that support the decision.
In short
- Ready to use: small surfaces, interventions between patients, no risk of dilution errors.
- Concentrate: large surfaces (floors, walls), lower cost per m², less packaging, but requires correct dosing and trained staff.
- In both cases, the concentration and contact time in the authorisation are mandatory.
Comparison criteria
| Criterion | Ready to use | Concentrate |
|---|---|---|
| Typical surface | Small: furniture, equipment, high-touch surfaces | Large: floors, walls, entire rooms |
| Risk of error | Minimal: the product is applied as supplied | Present: underdosing reduces efficacy, overdosing increases cost and residues |
| Contact time | Often short (e.g. 1–5 minutes) | Varies with the chosen concentration |
| Flexibility | A single efficacy level | Concentration adapted to the intended effect |
| Cost per m² | Higher on large surfaces | Lower, especially at high volumes |
| Storage and transport | More packaging | Less volume and packaging waste |
How to calculate the dilution
Basic formula: mL of product = concentration (%) × volume of solution (L) × 10.
| Desired concentration | Working solution | Product required |
|---|---|---|
| 0.25% | 10 L | 25 mL |
| 1% | 10 L | 100 mL |
| 2% | 10 L | 200 mL |
| 5% | 10 L | 500 mL |
Pour the water first, then the product, into a clean, labelled container. A dispenser or measuring jug reduces errors.
How to compare cost per m²
Compare the cost per m² treated, not the price per litre. For a concentrate applied at 40 mL of solution per m² (the rate in the Bionet A15 and Biosept Floor authorisation), at 1% you need 0.4 mL of product per m², i.e. 1 L of product for 2,500 m². For a ready-to-use product, calculate the amount actually sprayed per m² in your practice.
Examples from the GM 2000 range
| Product | Type | Main use |
|---|---|---|
| Hexy Spray | Ready to use | Surfaces and equipment in healthcare facilities; 1-minute action |
| Bionet SP Sanidor | Ready to use | Hard, non-porous surfaces; healthcare facilities and food industry (PT4) |
| Bionet A15 | Concentrate | Large surfaces, from 0.25% to 5% depending on the intended effect |
| Biosept Floor | Concentrate | Floors and walls, with degreasing effect |
Common mistakes
- Diluting a ready-to-use product: this cancels its demonstrated efficacy.
- Dosing the concentrate “by eye”.
- Preparing the solution in unmarked containers or food packaging, which Romanian MoH Order 1761/2021 prohibits.
- Choosing solely on price per litre.
Frequently asked questions
Can I dilute a ready-to-use disinfectant to save money?
No. Its efficacy was demonstrated undiluted; any dilution means it no longer complies with the authorisation.
How long can I keep a working solution prepared from a concentrate?
Use it within the stability period stated on the product label and replace it when it becomes soiled.
Is rinsing necessary?
It depends on the product and the surface; follow the label and the facility’s procedure, especially on surfaces in contact with food.
GM 2000 products for this application
References
- Authorisations of the products cited, available on the product sheets.
- Romanian Ministry of Health Order no. 1761/2021 approving the Technical Rules on cleaning, disinfection and sterilisation in public and private healthcare facilities, Annex 1.
Article reviewed by the GM 2000 technical team. Last updated: 22.10.2026. Product information is taken from the authorisations issued by the Romanian Ministry of Health; for other applications, refer to the label and the technical data sheet.
Use biocides safely. Always read the label and product information before use.
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