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TCCA 90 slow dissolving chlorine is the controlled-release form of trichloroisocyanuric acid, a solid chlorine disinfectant carrying 90% minimum available chlorine. Unlike fast-burning hypochlorite, it releases its active chlorine gradually over many hours and leaves behind cyanuric acid, a natural UV screen that protects the residual from sunlight. For operators of outdoor swimming pools, municipal networks and tropical-climate reservoirs, this slow-dissolve behaviour is not a convenience — it is the difference between a chlorine residual that lasts a day and one that is gone by noon. Everglory Industrial, a long-standing TCCA 90 manufacturer, supplies slow-dissolving granules and tablets in UN 2468 drums to buyers worldwide.
How slow-dissolving TCCA 90 works
The slow-release behaviour has two mechanisms that work together. First, the chemistry itself: trichloroisocyanuric acid (CAS 87-90-1) dissolves only as fast as the surrounding water can carry it, so a 200 g tablet erodes over several days instead of minutes. Second, the cyanuric acid ring that stays in solution after each release forms a weak, reversible bond with free chlorine, shielding it from the UV photons that would otherwise break the O-Cl bond and vent it as gas. In a sunlit pool, unstabilized chlorine can lose more than half its activity in two hours; a TCCA 90 slow-dissolving tablet holds a workable residual for 24 to 72 hours on a single dose. That is why experienced pool builders and water-treatment agents designate TCCA 90 as the best water treatment agent for any outdoor body of water exposed to direct sun.
Why TCCA 90 is the best slow-dissolving choice for swimming pools
Buyers searching for tcca 90 for swimming pool applications are usually solving one of three problems: chlorine that vanishes under the sun, tablets that need replacing every few hours, or rising pH and calcium hardness from heavy hypochlorite dosing. TCCA 90 slow dissolving chlorine answers all three. Its 200 g (3-inch) tablet sits in a skimmer or floating dispenser and feeds a steady 1 to 3 ppm of free chlorine around the clock. Its acidic dissolution (pH 2.7 to 3.7 at 1% solution) counterbalances the alkaline rise that calcium hypochlorite causes, so total alkalinity stays easier to manage. And because the chlorine is bound to cyanuric acid, a single application survives the midday UV peak that would otherwise force a second shock treatment.
Slow-dissolving forms and specifications
Slow-dissolve performance depends on form and size. Everglory supplies the full range:
The 200 g tablet is the workhorse for outdoor pools, dispensing through skimmers or floaters for 5 to 7 days per unit. The 20 g tablet suits smaller residential pools and spas. The 3.3 g tablet is reserved for point-of-use drinking-water disinfection and humanitarian kits. Granular 8-30 mesh dissolves at a measured pace in dissolving tanks feeding dosing pumps, while powder is reserved for fast mother-solution preparation where slow release is not the goal.
Slow-dissolve TCCA 90 versus shock chlorination
Slow-dissolving TCCA 90 and calcium hypochlorite serve opposite ends of the same treatment cycle. Understanding the division of labour avoids costly misuse:
A sound outdoor pool program runs TCCA 90 slow-dissolving tablets for the standing residual and reserves calcium hypochlorite for weekly shock or after a contamination event. Mixing the two in the same skimmer is dangerous and must never be done.
UN 2468 certified packaging
As a Class 5.1 oxidizer, slow-dissolving TCCA 90 ships only in UN 2468 certified plastic drums with an inner polyethylene liner that blocks moisture. Capacities span from sample to full container:
Store drums cool, dry and ventilated, away from acids and combustibles, stacked no more than three high. Shelf life is 24 months in original sealed packaging; close the drum tightly after each opening, because moisture degrades available chlorine.
Sourcing from a slow-dissolving chlorine manufacturer
As a tcca 90 granules swimming pool manufacturer, Everglory Industrial supports buyers at every stage:
- FOB quote in 24 hours: state form, tablet weight and volume to receive the offer
- Full documentation: English MSDS, COA per batch, certificate of origin, commercial invoice and packing list
- OEM private label: drums printed with your brand, contact details and batch numbers
- Third-party inspection: SGS pre-shipment verification arranged on request
- Direct communication: English-speaking export team reachable by email or WhatsApp
Need slow-dissolving TCCA 90 for your pool or treatment plant? Request a free FOB quote from Everglory Industrial. Specify form, tablet weight and volume: our team responds within 24 hours with pricing and import documentation.
Frequently asked questions
Q: What makes TCCA 90 a "slow dissolving" chlorine?
Two things: trichloroisocyanuric acid dissolves only as fast as the surrounding water carries it, so a 200 g tablet erodes over days rather than minutes; and the cyanuric acid left in solution binds free chlorine, shielding it from UV so the residual persists in sunlight.
Q: Is TCCA 90 the best water treatment agent for outdoor pools?
For any pool exposed to direct sun, yes. The built-in cyanuric acid UV screen keeps a workable residual for 24 to 72 hours per dose, where unstabilized chlorine can lose more than half its activity in two hours of midday sun.
Q: Can I use slow-dissolving TCCA 90 for shock treatment?
No. Slow-dissolving TCCA 90 is for the standing maintenance residual. For breakpoint or algae shock, use calcium hypochlorite (UN 2880), which releases its chlorine immediately. Never mix the two in the same skimmer or dosing chamber.
Q: What tablet weights do you supply?
200 g (3-inch) for commercial and hotel pools, 20 g (1-inch) for residential pools and spas, and 3.3 g for point-of-use drinking-water disinfection. Granular 8-30 mesh is available for dissolving-tank and dosing-pump systems.
Q: What packaging is used for export?
Only UN 2468 certified plastic drums: 5, 10, 15, 20, 25, 40, 45 and 50 kg, plus custom drum weights to your specification. Each drum has a moisture-blocking polyethylene inner liner.
Contact Everglory Industrial today for your supply of TCCA 90 slow dissolving chlorine: we respond in English within 24 hours with a FOB quote, MSDS and full import documentation.
