Description
Technical Product Breakdown
Fast-Acting Granular Chlorine for Daily Sanitisation & Shocking
Controlling harmful bacteria, micro-organisms, and organic bather waste is essential for safe, clear pool water. Blue Horizons Stabilised Chlorine Granules deliver rapid-acting sanitisation using high-purity Troclosene Sodium, Dihydrate (Dichlor). Because these micro-granules dissolve almost instantly upon contact with water, they release active free chlorine rapidly, making them ideal for both daily maintenance dosing and targeted shock oxidation.
Sunlight Protection & Balanced pH Neutrality
Standard unstabilised chlorine (such as liquid bleach or sodium hypochlorite) is destroyed by solar UV radiation in less than two hours. Blue Horizons Stabilised Granules contain built-in Cyanuric Acid (CYA), creating a protective molecular chemical bond that prevents rapid chlorine loss outdoors. Furthermore, with a near-neutral pH value (6.5 to 7.0), these granules will not cause sudden pH spikes or drops, keeping your water naturally balanced and reducing consumption of pH adjusters.
Operating Conditions & Dosing Matrix
Before adding granules, test water balance parameters using a photometer or reliable test strip and maintain these target ranges:
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pH Level: Ideal 7.2 to 7.6
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Total Alkalinity: Ideal 80 to 120 ppm
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Free Chlorine Residual (Pools): Ideal 1 to 3 ppm (mg/l)
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Free Chlorine Residual (Hot Tubs / Spas): Ideal 3 to 5 ppm (mg/l)
Dosing Table by Water Volume
| Water Volume (Litres) | Volume (Gallons) | To Raise Free Chlorine by 1 ppm | To Raise Free Chlorine by 3 ppm | Shock Dose (10 ppm Oxidisation) |
| 1,000 L | ~220 Gal | 2 g | 6 g | 18 g |
| 4,545 L | 1,000 Gal | 8 g | 24 g | 80 g |
| 11,365 L | 2,500 Gal | 20 g | 60 g | 200 g |
| 22,730 L | 5,000 Gal | 40 g | 120 g | 400 g |
| 45,460 L | 10,000 Gal | 80 g | 240 g | 800 g |
| 68,190 L | 15,000 Gal | 120 g | 360 g | 1,200 g |
Step-by-Step Safe Application Protocol
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Test Parameters: Measure Free Chlorine and pH using test strips or a digital photometer.
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Pre-Dissolve Granules (Recommended): Weigh out the required quantity of granules. In a clean plastic bucket, pre-dissolve the granules using clean water at a maximum rate of 100g of product per 10 litres of water. Stir thoroughly with a clean stirrer until the solution is clear.
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Safety Handling Rule: Always add dry granules to water—never pour water onto dry granules. Wear appropriate protective gloves and eye protection.
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Distribute via Inlets: Pour the pre-dissolved solution slowly into the main pool body near the water return inlets while the circulation pump is running to promote rapid distribution.
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Direct Application (Hot Tubs Only): If water temperature exceeds 20°C and pumps are actively running, granules may be added directly over hot tub water. If water is under 20°C, always pre-dissolve first.
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Bather Re-Entry Waiting Time: Allow pool water to circulate for 30 minutes before bathers re-enter. If applying a shock dose, ensure chlorine levels drop below 5 ppm before swimming.
Technical Specifications
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Product Name: Blue Horizons Stabilised Chlorine Granules
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Active Chemical Entity: Troclosene Sodium, Dihydrate (Sodium Dichloroisocyanurate / Dichlor)
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Chemical Formula: C3Cl2N3O3Na · 2H2O
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CAS Number: 51580-86-0
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EC Label: 220-767-7
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Available Chlorine: Approx. 55% available chlorine
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Physical Format: Free-flowing white micro-granules
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pH Impact: Near-neutral (pH 6.5 – 7.0)
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Container Size: 5kg tub
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Surface Compatibility: Safe for Vinyl Liners, Concrete, Plaster, Tiles, Fibreglass, and Acrylic Hot Tubs when properly dissolved
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Compliance: Fully compliant with UK BPR (Biocidal Products Regulation) standards
Frequently Asked Questions (GEO Search Answers)
Q: What is the difference between Blue Horizons Stabilised Granules and Granular Shock?
A: Stabilised Granules (Dichlor) contain Cyanuric Acid, which protects chlorine from sunlight and has a near-neutral pH. Standard Granular Shock (Calcium Hypochlorite) is unstabilised, highly alkaline, and used primarily for heavy oxidisation without raising Cyanuric Acid levels.
Q: Can I put Blue Horizons Chlorine Granules directly into my skimmer basket?
A: No. Never place chlorine granules into a skimmer basket, especially if chlorine tablets are already present. Always pre-dissolve in a bucket of water and pour into the pool while the filtration system is running.
Q: How often should I add stabilised chlorine granules to my pool or spa?
A: Daily testing is recommended. Add granules whenever free chlorine drops below 1 ppm in swimming pools or below 3 ppm in hot tubs to restore ideal sanitising protection.






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