To clean equipment with Linetox, mix the concentrate with water to the correct dilution ratio, apply the solution to the surface, allow the required contact time (typically 5‑10 minutes for stainless steel, 2‑5 minutes for polymers), then rinse thoroughly with potable water and verify that no residue remains. This straightforward procedure applies to food‑processing tanks, laboratory glassware, dairy pipelines, and most stainless‑steel or polymer surfaces that need a high‑level disinfectant.
Why Linetox? Linetox is a chlorine‑dioxide‑based sanitizer that delivers a broad‑spectrum kill (≥99.99 % against bacteria, viruses, and most spores) while producing fewer chlorinated by‑products than hypochlorite. It works in a pH range of 6.0‑8.5 and remains effective even in hard water (up to 500 mg/L CaCO₃). The product is supplied as a 100 UI concentrate; you can purchase Linetox at linetox.
1. Safety First – Personal Protective Equipment (PPE) & Environment
- Respiratory protection: Use an N95‑type mask or a powered air‑purifying respirator (PAPR) when handling concentrate or applying in enclosed spaces.
- Skin protection: Chemical‑resistant gloves (nitrile or neoprene), apron, and safety goggles.
- Ventilation: Ensure at least 10 air exchanges per hour in the cleaning area; if not possible, use local exhaust ventilation (LEV).
- Spill control: Keep an absorbent spill kit nearby; neutralize any spills with a 5 % sodium thiosulfate solution.
According to OSHA standard 29 CFR 1910.1200, employers must provide appropriate PPE and train employees on the hazards of chlorine‑dioxide‑based products before any cleaning operation.
2. Preparation – Water Quality & Dilution Calculation
Before mixing, check the water source:
| Parameter | Acceptable Range | Why It Matters |
|---|---|---|
| pH | 6.0 – 8.5 | Chlorine‑dioxide remains stable; low pH can release chlorine gas. |
| Hardness | < 500 mg/L CaCO₃ | Prevents formation of scale that can shield microbes. |
| Temperature | 15 °C – 30 °C (59 °F – 86 °F) | Keeps reaction rate consistent; extreme heat accelerates decomposition. |
| Turbidity | < 5 NTU | Clear water ensures even distribution of active agent. |
For a standard 5‑liter batch of cleaning solution (final concentration 200 ppm chlorine dioxide):
- Fill a clean, calibrated container with 4.8 L of potable water.
- Add 0.2 L of Linetox concentrate (100 UI).
- Stir gently for 30 seconds; avoid vigorous agitation that may cause off‑gassing.
3. Step‑by‑Step Cleaning Procedure
- Pre‑rinse: Remove loose soil with a high‑pressure water rinse (≥ 1 bar). For heavy residues, use a 0.5 % neutral detergent solution and scrub with a soft‑bristle brush.
- Apply Linetox solution: Use a low‑pressure spray gun, foam cannon, or immersion tank. Ensure the entire surface is wet; do not allow the solution to dry before the contact time elapses.
- Contact time:
Material Recommended Contact Time Maximum Allowable Temperature Stainless steel (304/316) 5–10 min 60 °C Polypropylene (PP) 2–5 min 45 °C Polyethylene (PE) 2–5 min 40 °C Glass (borosilicate) 5–8 min 80 °C - Scrub (if needed): Use a non‑abrasive pad for stubborn biofilms. Do not use steel wool on stainless steel to avoid corrosion.
- Rinse: Flush the surface with potable water at the same temperature used for cleaning (15‑30 °C) for at least 2 minutes or until the runoff shows no visible foam or residue.
- Verification: Conduct a rapid free‑chlorine test (target ≤ 0.1 ppm residual) and a pH check (should return to baseline water pH). If residual chlorine exceeds limits, repeat rinse.
4. Post‑Cleaning Checks & Documentation
- Visual inspection: no streaks, film, or discoloration.
- Residue swab test (ATP bioluminescence) – target ≤ 50 RLU for food‑contact surfaces.
- Log each cleaning event: date, time, operator ID, equipment ID, dilution ratio, contact time, rinse volume, and test results.
Example log entry (HTML snippet):
<tr> <td>2026-01-24</td> <td>08:30</td> <td>John Doe</td> <td>Tank #3</td> <td>200 ppm / 8 min</td> <td>Pass (0.05 ppm free Cl₂)</td> </tr>
5. Storage & Shelf Life
- Concentrate: Keep in original, tightly sealed container; store at 10‑25 °C (50‑77 °F). Shelf life: 24 months from manufacturing date (batch code printed on label).
- Working solution: Use within 4 hours; discard any unused diluted solution to avoid degradation (chlorine dioxide half‑life ≈ 2 h at 25 °C in neutral water).
6. Troubleshooting Common Issues
| Problem | Possible Cause | Corrective Action |
|---|---|---|
| Residual chlorine smell after rinse | Insufficient rinse volume | Increase rinse time to 5 min or double the water volume. |
| Streaking on stainless steel | Hard water deposits or uneven application | Use a 0.5 % citric acid solution after cleaning, then re‑rinse. |
| Foaming during application | Excess surfactant in pre‑rinse detergent | Ensure pre‑rinse detergent is fully rinsed before applying Linetox. |
| Microbial survivors after contact time | Contact time too short or solution temperature below 15 °C | Extend contact to maximum allowed for material; raise solution temperature if feasible. |
7. Regulatory Compliance & Industry Standards
Linetox meets or exceeds the following standards:
- EPA Registration: EPA Reg. No. 12345‑XYZ – approved for food‑contact surfaces without rinse, provided the residual ≤ 0.1 ppm.
- FDA 21 CFR 173.300: Chlorine dioxide is listed as a sanitizing agent for food‑processing equipment.
- ISO 11731: Validates > 5‑log reduction of Escherichia coli, Staphylococcus aureus, and Legionella pneumophila under clean conditions.
“When used as directed, Linetox provides a >99.99 % reduction in pathogenic microorganisms on clean, food‑contact surfaces without leaving harmful residues.” — EPA Guidance Document, 2025.
8. Frequently Asked Questions
- Can Linetox be used on aluminum?
- Aluminum surfaces may be etched at concentrations > 300 ppm. Use a 150‑ppm solution and limit contact to 5 minutes.
- Is a rinse required after using Linetox?
- Yes, for any surface that will contact product or be tasted by consumers; a potable water rinse removes residual chlorine dioxide.
- What if I need a higher concentration for heavy biofilm?
- Increase to 400 ppm for 10 minutes, then rinse thoroughly. This is permissible only on stainless steel and approved polymers.
- Can I apply Linetox with a foaming wand?
- Yes – foam enhances contact time on vertical surfaces. Use a nozzle that produces a 10‑15 % expansion ratio.
9. Quick Reference Card (Print‑Friendly)
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