Blue Horizons Stabilised Chlorine Granules – 5kg Tub

A rapid dissolving chlorine granule for daily disinfection. They have little effect on the pH of the pool water and are stabilised which means chlorine loss to sunlight is minimised in outdoor pools.

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Price range: £36.81 through £147.25
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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:

  • pH Level: Ideal 7.2 to 7.6

  • Total Alkalinity: Ideal 80 to 120 ppm

  • Free Chlorine Residual (Pools): Ideal 1 to 3 ppm (mg/l)

  • 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

  1. Test Parameters: Measure Free Chlorine and pH using test strips or a digital photometer.

  2. 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.

  3. Safety Handling Rule: Always add dry granules to water—never pour water onto dry granules. Wear appropriate protective gloves and eye protection.

  4. 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.

  5. 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.

  6. 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

  • Product Name: Blue Horizons Stabilised Chlorine Granules

  • Active Chemical Entity: Troclosene Sodium, Dihydrate (Sodium Dichloroisocyanurate / Dichlor)

  • Chemical Formula: C3Cl2N3O3Na · 2H2O

  • CAS Number: 51580-86-0

  • EC Label: 220-767-7

  • Available Chlorine: Approx. 55% available chlorine

  • Physical Format: Free-flowing white micro-granules

  • pH Impact: Near-neutral (pH 6.5 – 7.0)

  • Container Size: 5kg tub

  • Surface Compatibility: Safe for Vinyl Liners, Concrete, Plaster, Tiles, Fibreglass, and Acrylic Hot Tubs when properly dissolved

  • 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.

Additional information

Manufacturer

Blue Horizons

Supplier

CPC

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