Biocide CMIT/MIT 1.4% – 20L

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Technical Reference

Technical Specifications

Applications & Use Cases

• Cooling tower and evaporative condenser water treatment: Broad-spectrum microbiological control including Legionella spp., algae, and biofilm-forming bacteria; compliant with AS/NZS 3666 cooling water management programs
• Industrial process water systems: Papermaking, mining water circuits, heat exchangers, and closed-loop cooling systems where microbial growth compromises process integrity
• Wastewater and effluent treatment: Biofilm suppression in collection systems, equalisation tanks, and recycle water streams
• Oilfield and drilling water systems: Control of sulfate-reducing bacteria (SRB) and general heterotrophic bacteria in injection water and produced water circuits
• Industrial membrane and RO systems: Biofouling prevention in reverse osmosis pre-treatment circuits (note: verify compatibility with specific membrane manufacturer specifications prior to use)
• Decorative water features and fountain systems: Algae and bacterial control in recirculating ornamental water bodies not used for human consumption
• Paper and pulp processing: Slime control in white water systems and stock preparation
• Metalworking fluid preservation: Extended service life of cutting and grinding fluids through microbial population management
• Air washer and scrubber systems: Microbiological control in industrial air handling water circuits
• Construction water and dust suppression circuits: Prevention of microbial proliferation in recirculating water used for dust control

Note: This product is not approved or registered for use in drinking water systems, potable water storage, or food-contact water applications. It is not suitable for residential swimming pools or spas. CMIT/MIT at 1.4% active is classified for industrial and commercial use only.

Dosing Rates & Guidelines

Important dosing notes: All rates above are indicative. Actual dosing must be validated by on-site microbiological monitoring (total viable count, Legionella testing where applicable). Efficacy is strongly pH-dependent — CMIT/MIT performs optimally between pH 6.5 and 8.5. At pH above 9.0, rapid hydrolysis of the active components reduces biocidal efficacy significantly. Water temperature, organic load, and system design all affect required dose. Site-specific water management plans should be developed by a qualified water treatment professional.

Dilution Instructions

1. Read the Safety Data Sheet (SDS) in full before handling. Ensure all relevant PPE is donned prior to opening the container (see Safety & Handling section below).
2. Prepare the dilution vessel: Use a clean HDPE, polypropylene, or stainless steel vessel of sufficient capacity. Do not use mild steel, galvanised steel, copper, or aluminium vessels — these are incompatible with the acidic solution and with isothiazolinones.
3. Add the required volume of clean, cool water first to the dilution vessel (ideally below 25°C). This product is an aqueous solution, not a concentrated acid, however the principle of adding chemical to water minimises localised concentration and heat effects.
4. Measure the required quantity of CMIT/MIT 1.4% using a calibrated dosing container, graduated cylinder, or metering pump. Avoid pouring directly from the 20 L container for small volumes — decant to a smaller measuring vessel first.
5. Add the measured CMIT/MIT solution slowly to the water with gentle agitation. The product is fully miscible with water. No significant exotherm is expected at typical use dilutions.
6. Mix thoroughly using a clean paddle or recirculating pump for a minimum of 2 minutes to ensure a homogeneous solution.
7. For direct injection into water systems via chemical dosing pumps: the product may be dosed neat (undiluted at 1.4%) through HDPE or polypropylene dosing lines and heads. Verify all wetted components of the dosing system are compatible before installation.
8. Label all diluted solutions immediately with chemical identity, concentration, date of preparation, and hazard information. Never store diluted biocide in unlabelled containers.
9. Prepared dilutions should be used within 24 hours where possible. Diluted solutions are less stable than the concentrated product — store prepared dilutions away from heat and light.
10. Dispose of any unused diluted solution in accordance with local council trade waste requirements or the SDS disposal guidance. Do not pour concentrated or diluted product down stormwater drains.

Chemical Compatibility

Compatible Materials (containers, pipework, dosing equipment)

• High-density polyethylene (HDPE) — preferred for storage and dosing
• Polypropylene (PP)
• Polyvinyl chloride (PVC) and CPVC
• 316 stainless steel (for short-term contact; HDPE preferred for long-term storage)
• PTFE (Teflon) for seals and diaphragms
• Viton (FKM) elastomers

Incompatible Materials

• Mild steel and galvanised steel: Corroded by the acidic solution; iron and zinc contamination also deactivates the active components
• Copper and copper alloys (brass, bronze): Rapid corrosion; heavy metal ions deactivate isothiazolinones and contaminate the treated water
• Aluminium: Reacts with acidic solution; not suitable for storage or dosing equipment
• Natural rubber and EPDM elastomers: Susceptible to degradation; use Viton or PTFE seals
• Polyamide (PA/nylon) RO membranes at elevated concentrations: May cause membrane damage; confirm with manufacturer at intended dose rate

Chemical Incompatibilities — Do NOT Mix With:

• Strong oxidising agents (chlorine, sodium hypochlorite, hydrogen peroxide, sodium persulphate, bromine): Oxidisers rapidly degrade and inactivate CMIT/MIT active components. Do not dose CMIT/MIT simultaneously with oxidising biocides into the same dosing point. Separate dosing points and allow sufficient time (minimum 30 minutes) between oxidising and non-oxidising biocide additions in batch treatments.
• Strong alkalis (caustic soda/sodium hydroxide, soda ash at high concentration): Alkaline hydrolysis destroys isothiazolinone ring structures and eliminates biocidal activity. Do not mix directly. If pH adjustment is required in the treatment system, dose biocide after pH has stabilised and is confirmed below pH 8.5.
• Strong reducing agents (sodium metabisulphite, sodium bisulphite, sodium thiosulphate): Sulphite-based compounds are known quenching agents for isothiazolinones — they will chemically neutralise the active components. Commonly used in analytical quenching and deactivation — important to note for emergency spill response (see below).
• Amines and amine-based corrosion inhibitors at high concentration: May form incompatible complexes and reduce biocide efficacy; evaluate compatibility before blending into combined treatment programmes.
• Thiol-containing compounds (mercaptans, cysteine): React directly with the isothiazolinone ring, eliminating biocidal activity.