A material preservative is treated as a water-treatment chemical
Require a product with explicit water-circuit uses.
Dichlorinated isothiazolinone with an octyl chain.
Open technical diagram · PubChem CID 91688
Non-oxidizing biocides / Specialized formulation
DCOIT formulations for industrial water
Dichlorooctylisothiazolinone formulations · DCOIT
Manufacturers offer specific formulations for industrial water microbial and algae control. Verify the dispersion system and industrial water uses of the formulated product; products for coatings or antifouling materials cannot be substituted directly.
Product uses
Microbial and algae control in specific industrial recirculating-water applications.
Bring an existing model or purchasing specification directly into the discussion.
Purchasing informationView parameter guidance ↓
- Chemical identity / CAS
- 64359-81-5DCOIT active ingredient; not a complete industrial-water formulation ↗
- Physical form / Type
- The industrial-water product's dispersion form, solvent and appearance must match actual supply.
- Key purchasing comparisons
- Water-treatment use and dispersion systemTarget algae or microbial trialsProcess compatibility and blowdown
- Packaging and delivery
- Confirm compatibility of the product dispersion system with packaging materials, handling methods and post-transport uniformity acceptance requirements.
Identity and physical form identify the product; specific concentration, grade, packaging and uses are governed by mutually confirmed formulated-product documents.
01 / Product and applications
Uses and product form
Chemical identity / Technical type
A specific formulation of 4,5-dichloro-2-octylisothiazolinone; distinct from CMIT/MIT.
Appearance and delivery form
Dispersion form, solvent and appearance must match actual supply; the raw-material name does not establish direct solubility in every water type.
Identity note
DCOIT is 4,5-dichloro-2-n-octylisothiazolinone, distinct from both CMIT/MIT and unchlorinated OIT. Its CAS cannot replace identification of the aquatic-use product's solvent, dispersion system and complete formulation.
02 / Specification selection
Key purchasing parameters
| Items to confirm | Relevance to purchasing and use |
|---|---|
| Water-treatment use and dispersion system | Distinguish from material-protection products. |
| Target algae or microbial trials | Evaluate efficacy against a defined target. |
| Process compatibility and blowdown | Check foam, deposits and final destination. |
Include parameters, test methods and acceptance checkpoints in purchasing requirements to compare specifications.
03 / Applications and limits
Applications and conditions of use
These are starting points for conditional verification. Specific product suitability still requires joint confirmation through product documents, operating conditions and destination requirements.
Additional checks before use
- Do not replace CMIT/MIT solely because both are isothiazolinones.
- Algae-control performance does not establish comprehensive pathogen disinfection.
- Current uses and market documents require separate confirmation.
04 / Common challenges
Common issues and responses
Uneven dispersion after addition
Check the formulation, actual water quality and metering equipment.
Judging disinfection success only by loss of green color
Test target microorganisms and system condition together.
05 / Documents and evidence
Documents and downloads
TDS / SDS / COARequest by specific model, use and batchProduct purchasing checklistDownload directly and add existing specifications and operating conditions
View public technical references
These documents support technical categories and use limits, not ENVO certifications or customer cases. Verification date: 2026-10-26.
06 / Frequently asked questions
Purchasing FAQs
Is DCOIT the same as Kathon-type CMIT/MIT?
No. Active ingredients and formulation performance differ.
Can coating-use DCOIT be added to recirculating water?
Not by assumption. Dispersion systems and use evidence must match.
How is efficacy assessed?
Use a combined evaluation of target microorganisms, algae and process parameters.
Related selection options
Compare related products further.
Related products are not necessarily direct substitutes; verify each intended use.
Constituent structuresNon-oxidizing biocides · Specialized formulation
Isothiazolinone Formulations
CMIT/MIT
For industrial water and process microbial control with clearly defined uses. Distinguish CMIT/MIT from other isothiazolinones and include the stabilization system, actual operating conditions and target-market documentation in purchasing checks.
Active componentNon-oxidizing biocides · Specialized formulation
Dazomet formulations for industrial water
Dazomet
Manufacturers list formulated product approaches for industrial cooling water, which must be strictly distinguished from agricultural soil-use products. Proceed to final purchasing selection only when current product documents cover the relevant water circuit.
Technical schematicSpecialized formulations · Specialized formulation
Biocide formulations for recirculating water
Recirculating water formulations
A purchasing starting point that considers system water quality, microbial diagnosis and corrosion/scale inhibition programs together. Compare oxidizing, non-oxidizing and validated blended approaches, then select a specific formulated product and operating objectives.
Related technical articles
Product positioning
Why separate DCOIT coating-preservation raw materials from industrial-water products on websites and in purchasing?
The same active may appear in different product sectors while formulations and use requirements differ. Industrial-water DCOIT purchasing needs the corresponding water-treatment product documents; coating-protection instructions cannot complete the review.
DCOIT formulations for industrial waterRecirculating Cooling Water & Heat ExchangersSelection and purchasing
Read and verify →
Performance acceptance
Cooling-tower green coloration fades after DCOIT: how can actual control be determined?
Visible color changes can be recorded, but do not alone establish whole-system recovery. DCOIT review should also include relevant biological parameters, the fate of deposits and actual equipment performance.
DCOIT formulations for industrial waterRecirculating Cooling Water & Heat ExchangersTesting and validation
Read and verify →
Additional targets
Recurring fungal contamination at a paper mill: how should DCOIT information connect with existing bacterial control?
An established bacterial-control program may not address all fungal problems. Public uses of industrial DCOIT products provide candidate approaches, but purchasing must identify the contamination location and validation objective.
Read and verify →ENVO · Purchasing and application support
Discuss your specific DCOIT industrial-water formulation requirements.
Start with a product name, current model, water-quality report or destination documentation requirements.