What is trichloroisocyanuric acid (TCCA)?

Trichloroisocyanuric acid TCCA is a solid, slow-dissolving chlorinating agent with the chemical formula C₃Cl₃N₃O₃, also known as trichloro-s-triazinetrione, delivering up to 90% available chlorine upon dissolution. It belongs to the cyanuric acid derivative family and ranks among the most effective oxidizing biocides available for water treatment today.

When TCCA dissolves in water, it releases hypochlorous acid — the active species responsible for killing bacteria, viruses, algae, and other pathogens. The cyanuric acid backbone acts as a stabilizer, slowing chlorine degradation under UV radiation. This makes TCCA particularly valuable in outdoor environments where unprotected chlorine loses efficacy within hours of sun exposure.

For a complete trichloroisocyanuric acid overview, including its full chemical structure and historical development, the Wikipedia entry provides a reliable starting point.

Physical and chemical properties

TCCA typically appears as white granules or compressed tablets with a characteristic chlorine odor. Its melting point is approximately 247 °C, and it has low water solubility — roughly 1.2 g per 100 mL at 25 °C — which explains its slow-release behavior in pool and water treatment systems. The pH of a 1% solution falls between 2.7 and 3.3, making it acidic enough to slightly lower pool water pH over time, a factor operators must monitor.

The detailed TCCA chemical properties database entry on PubChem lists molecular weight (232.41 g/mol), CAS number (87-90-1), and comprehensive toxicological data for professional reference.

Available forms: tablets, granules, and powder

Manufacturers supply TCCA in several physical forms, each suited to a different application. TCCA tablets — typically 200 g or 500 g compressed discs — are the dominant format for swimming pool chlorine tablets because they dissolve slowly and predictably in automatic feeders or floating dispensers. TCCA granules dissolve faster, making them better for shock treatments or industrial dosing systems. Powdered TCCA (often labeled TCCA 90%) is used in large-volume water treatment where rapid mixing is possible. OEM packaging in custom weights and labeling is widely available from chemical suppliers, enabling distributors to serve specific market segments without reformulation.

TCCA in swimming pool sanitation

Swimming pool sanitation represents the single largest end-use market for TCCA globally. The compound's combination of high available chlorine content, UV stability, and convenient solid form makes it the preferred pool sanitizer for both commercial aquatic facilities and private pools across Russia and the broader CIS region.

How TCCA maintains pool water quality

Maintaining a safe, clear pool requires sustained free chlorine levels between 1.0 and 3.0 mg/L (ppm), a pH range of 7.2–7.6, and cyanuric acid (stabilizer) levels of 30–50 ppm. TCCA tablets placed in a floating dispenser or automatic feeder release chlorine continuously over 5–7 days per tablet, depending on water temperature, bather load, and sunlight intensity. The simultaneously released cyanuric acid builds up the stabilizer reserve automatically — a convenience that liquid sodium hypochlorite cannot match.

Why do so many pool operators still underestimate the importance of cyanuric acid balance? Because too little stabilizer allows UV radiation to destroy chlorine within two hours of application, while too much (above 100 ppm) can suppress chlorine's disinfecting power and create what chemists call "chlorine lock." Regular testing with a reliable test kit or photometer is non-negotiable.

Step-by-step TCCA dosing procedure for pools

1. Test current free chlorine, pH, alkalinity, and cyanuric acid levels using a calibrated kit.
2. Adjust pH to 7.2–7.6 using sodium carbonate (pH+) or sodium bisulfate (pH−) before adding TCCA.
3. Calculate the required TCCA dose: approximately 2 g of TCCA 90% per 1 m³ of water raises free chlorine by roughly 1.8 ppm.
4. Place TCCA 200 g tablets in a floating dispenser or inline feeder — never add tablets directly to the skimmer basket unless the manufacturer specifies otherwise.
5. For shock treatment (superchlorination), dissolve TCCA granules in a bucket of water first, then distribute evenly around the pool perimeter with the pump running.
6. Retest after 4–6 hours and adjust as needed. Do not allow swimmers to enter until free chlorine drops below 5 ppm.
7. Monitor cyanuric acid monthly; if levels exceed 80 ppm, partially drain and refill the pool to dilute.

Municipal and drinking water treatment

Beyond pool chemistry, trichloroisocyanuric acid TCCA serves as a potent water treatment chemical in municipal disinfection programs, emergency water purification, and rural water supply systems — particularly where infrastructure for handling liquid chlorine is unavailable or unsafe.

Emergency and remote water disinfection

TCCA's solid, stable form gives it a decisive logistical advantage in emergency response scenarios. Humanitarian organizations and civil defense agencies have used effervescent TCCA tablets to disinfect water in disaster zones, remote military camps, and rural communities across Central Asia and Siberia. A single 1 g tablet typically treats 10–20 liters of moderately turbid water to WHO microbiological standards, though pre-filtration is recommended when turbidity exceeds 4 NTU.

Limitations in large-scale municipal systems

Municipal water utilities in Russia's larger cities — Moscow, St. Petersburg, Novosibirsk — primarily use gaseous chlorine or sodium hypochlorite solutions for cost reasons at high volumes. TCCA becomes economically competitive at smaller scales: district-level water stations, resort complexes, industrial parks with self-contained water networks, and temporary treatment installations. It is worth noting that the cyanuric acid released by TCCA accumulates in treated water over time; for drinking water applications, this requires monitoring against local regulatory limits, as cyanuric acid has no established taste threshold but is subject to review by Rospotrebnadzor guidance documents.

"Trichloroisocyanuric acid provides a residual disinfectant effect comparable to gaseous chlorine at equivalent active chlorine doses, with the significant operational advantage of safe solid handling and extended shelf stability." — WHO Guidelines for Drinking-water Quality, 4th edition

Industrial water treatment applications

Industrial facilities consume substantial quantities of TCCA as an oxidizing biocide in systems where biological fouling poses operational or safety risks. The key sectors include cooling towers, paper and pulp mills, oil field water injection systems, and textile processing plants.

Cooling tower biofouling control

Cooling towers are, in effect, ideal incubators for Legionella pneumophila and biofilm-forming bacteria — warm, aerated water circulating over large surface areas. Industrial hygiene standards in Russia (as referenced in SanPiN 2.1.3.2630-10 and updated guidance) mandate biocide treatment programs for open cooling systems. TCCA granules or tablets added via automatic dosing pumps maintain a residual oxidant concentration of 0.3–0.5 mg/L free chlorine in recirculating water, which suppresses Legionella growth and controls algae formation on fill media.

Practical experience from industrial facilities shows that combining TCCA with a non-oxidizing biocide (such as isothiazolinone-based products) on alternating cycles delivers superior biofilm control compared to either product alone — a rotation strategy that also mitigates resistance development.

Textile and paper industry disinfection

In textile dyeing and finishing operations, TCCA functions both as a chlorinating agent for fabric bleaching and as a process water disinfectant. Paper mills use it to control slime-forming bacteria in white water circuits. At these sites, TCCA 90% powder is typically dissolved in a continuous-feed system, with dose rates calibrated to incoming water quality and production throughput. Just like a precisely tuned engine requires the right fuel mixture, industrial water systems perform reliably only when biocide dosing is matched to the actual biological load — over- or under-dosing both carry operational costs.

Agricultural and food industry uses

TCCA's role extends well beyond aquatic environments. In agriculture and food processing, it functions as a surface disinfectant, irrigation water treatment agent, and equipment sanitizer — applications that are growing in importance as food safety regulations tighten globally.

Irrigation water treatment and soil disinfection

In greenhouse horticulture and large-scale drip irrigation systems, waterborne pathogens such as Phytophthora and Pythium species can devastate crops. Adding TCCA to irrigation water at low concentrations (0.5–2 ppm free chlorine at the emitter) provides effective suppression of these pathogens without damaging plant tissue, provided pH is maintained above 6.5. Russian greenhouse operators in regions like Belgorod and Krasnodar have adopted this approach, particularly in high-value tomato and cucumber production. Of course, also worth noting: chlorine at higher concentrations can harm sensitive crops and soil microbiota, so dosing precision and monitoring are essential.

Food processing facility sanitation

TCCA-based sanitizers are used to disinfect hard surfaces, food contact equipment, and processing water in meat, dairy, and produce facilities. Effervescent TCCA tablets dissolve in cold water to produce ready-to-use sanitizing solutions at 50–200 ppm active chlorine — effective against E. coli, Salmonella, and Listeria species per standard microbiological testing protocols. Regulatory acceptance varies by country and application; operators should verify compliance with applicable TR CU (Technical Regulation of the Customs Union) requirements for food contact disinfectants before deployment.

TCCA vs. alternative disinfectants: a comparison

Choosing the right chlorine disinfectant requires weighing available chlorine content, stability, handling safety, cost, and regulatory status. The table below compares TCCA against its two closest alternatives — dichloroisocyanuric acid (SDIC/DCCA) and calcium hypochlorite — across the metrics most relevant to B2B buyers.

Parameter	TCCA (trichloroisocyanuric acid)	SDIC / dichloroisocyanuric acid	Calcium hypochlorite
Available chlorine	~90%	~60–65%	~65–70%
UV stability	High (cyanuric acid stabilized)	High (cyanuric acid stabilized)	Low (unstabilized)
Dissolution rate	Slow (tablets), moderate (granules)	Fast (granules/tablets)	Fast to moderate
Solution pH	2.7–3.3 (acidic)	~6.0–6.5	10–12 (highly alkaline)
Shelf life	2–3 years (dry storage)	1–2 years	1–2 years
Typical cost (USD/kg, bulk)	1.20–1.80	1.50–2.20	0.90–1.40
Best application	Outdoor pools, industrial cooling	Indoor pools, rapid shock dosing	Municipal, high-turbidity water

* Bulk pricing indicative as of 2026 market data; actual quotes vary by origin, packaging, and volume.

When to choose TCCA over SDIC

TCCA's higher available chlorine content (90% vs. 60–65% for SDIC) means lower product weight per unit of disinfecting power — a significant logistics and storage cost advantage for high-volume buyers. However, SDIC's faster dissolution and near-neutral pH make it preferable for indoor pools where pH management is more sensitive, and for rapid shock treatments where speed matters more than slow release. For outdoor commercial pools and industrial cooling towers in Russia's climate — where long storage through winter and efficient summer dosing are both important — TCCA tablets remain the standard specification.

Safety, handling, and regulatory compliance

TCCA is a powerful oxidizer and must be handled with the care any such chemical demands. Its safety profile is well-characterized, and compliance with established protocols protects both operators and the environment.

Hazard profile and storage requirements

TCCA is classified as an oxidizing solid (UN 2468, Hazard Class 5.1) under international transport regulations. Contact with reducing agents, organic materials, ammonia compounds, or moisture can trigger exothermic decomposition and chlorine gas release. Storage requirements are unambiguous: dry, well-ventilated warehouses, away from flammable materials, in original sealed packaging, at temperatures below 35 °C. Never mix TCCA with other pool chemicals — not even other chlorine products — in the same container or confined space.

Refer to the official TCCA safety and hazard data from the US CDC/NIOSH Pocket Guide for comprehensive occupational exposure limits, first aid measures, and emergency response guidance, which serves as a globally recognized reference even outside US jurisdiction.

Personal protective equipment (PPE) and first aid

Operators handling TCCA in granule or powder form must wear chemical-resistant gloves (nitrile or neoprene), safety goggles, and a dust mask or half-face respirator with a P2 particulate filter. In enclosed spaces or during large-scale dosing operations, a full-face respirator with an organic vapor/acid gas cartridge is recommended. In case of skin or eye contact, flush immediately with large volumes of water for at least 15 minutes and seek medical attention. Consult a qualified occupational health professional for site-specific risk assessments.

The European Chemicals Agency's TCCA substance information page provides REACH registration data, classification under CLP/GHS, and authorized use conditions within the European regulatory framework — a useful reference for exporters and importers operating across the Russia-EU trade corridor.

Buying guide: TCCA specifications and wholesale sourcing

For B2B buyers in Russia sourcing TCCA in volume, understanding product specifications and supplier evaluation criteria is as important as knowing the chemistry. The market offers wide variation in product quality, packaging formats, and certification status.

Key specifications to verify before purchasing

Available chlorine content is the primary quality indicator. Reputable TCCA 90% product should test at 88.5–90.5% available chlorine per batch certificate. Moisture content should not exceed 0.5%; higher moisture accelerates decomposition and reduces shelf life. For tablets, hardness (measured in Newtons of compressive force) matters for handling and feeder compatibility — a minimum of 40 N is standard for 200 g pool tablets. Request a Certificate of Analysis (CoA) for every consignment, and verify that the assay method cited (typically iodometric titration per ISO or GB standards) matches your internal QC protocol.

OEM packaging and certification for the Russian market

Many Russian distributors and pool chemical retailers source TCCA in bulk (25 kg drums or 50 kg bags) and repackage under their own labels for the retail and professional markets. OEM packaging services — including custom label design, weight variants from 1 kg consumer packs to 50 kg trade packs, and Russian-language safety labeling compliant with ГОСТ (GOST) requirements — are available from established chemical suppliers. When evaluating suppliers, confirm whether they hold ISO 9001 quality management certification and can provide documentation for customs clearance under HS code 2933.69 (heterocyclic compounds, nitrogen-only heteroatom). Products entering Russia for use in drinking water or food contact applications additionally require Rospotrebnadzor registration; verify this status explicitly with the supplier before committing to a purchase order.

When negotiating bulk prices, benchmark against the indicative 2026 market range of USD 1.20–1.80/kg CIF for TCCA 90% tablets from primary exporting regions. Significant deviations — either suspiciously low or high — warrant additional supplier due diligence. Volume discounts typically apply at thresholds of 1 MT, 5 MT, and 20 MT per shipment.

Conclusion

Trichloroisocyanuric acid TCCA has earned its position as a cornerstone water treatment chemical across a remarkable range of applications — from the outdoor swimming pools of Sochi resort complexes and the cooling towers of Siberian industrial facilities, to emergency water purification kits and food processing sanitation systems. Its unmatched 90% available chlorine content, UV stability, solid-form convenience, and multi-year shelf life make it the benchmark against which other chlorinating agents are measured.

For B2B buyers and distributors in Russia, the commercial case for TCCA is straightforward: lower product weight per unit of disinfecting power, predictable slow-release performance in tablet form, and a well-established global supply chain with OEM packaging flexibility. What separates successful sourcing from costly mistakes is due diligence on product specifications, supplier certifications, and regulatory compliance requirements — all areas this guide has addressed directly.