hth® Blue Sparkle Chlorinating Granules 65, 16kg

  • controls bacteria and algae in swimming pool waters
  • destroys organic contaminants
  • promotes sparkling clean water
  • sanitizes pool water

hth® Blue Sparkle Chlorinating Granules 65 is a highly effective multipurpose product that sanitizes, clarifies, and helps prevent algae.

Add the recommended amount of this product during evening hours while the filter pump is running. Broadcast the product evenly over a wide area in the deepest part of the pool.

For best product performance, swimmer comfort and crystal clear water, maintain the following daily levels as determined by a reliable testing kit. Use the appropriate pool care products to make adjustments.


  • Free available chlorine (FAC): 1.0-3.0ppm
  • pH: 7.2-7.8
  • Total alkalinity: 80-120ppm
  • Calcium hardness: 200-300ppm

Initial shock treatment: When opening your pool, initially superchlorinate pool water with 150g of this product per 10,000L of pool water. For best results, superchlorinate at dusk.

Routine chlorination: Maintain proper chlorine residual by broadcasting daily over the pool's surface, 30g of this product per 10,000L of pool water, or as needed.

Note: Hot weather, heavy pool usage, and rain my require higher usafe rates to maintain proper chlorine residual. For outdoor pools, chlorine residuals can be protected from destruction by run's rays by addition of stabilizer (cyanuric acid).


Maintaining proper chlorine levels

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Test Your Water

How often you should test and balance your pool water can vary based on how often you use it, and is also dependent on a number of other variables. It’s important to remember that for chlorine and pH, you should usually test your pool two to three times a week. That may sound like a lot, but water balance is vital for your pool’s health and the health of the people who swim in it. When your pool is out of balance, your sanitizers can be less effective, the water can cause irritation to the skin and eyes and if the water gets imbalanced enough, it can even damage the pool’s surfaces, structure, or equipment.

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Shock Weekly

In ideal circumstances, shocking your pool just once a week will keep it looking clean and clear, but any heavy rainfall, signs of algae, use by lots of swimmers, or periods of very sunny weather can deplete free chlorine levels, which means an extra dose of hth® Shock is needed. Sundown is optimum time to shock your pool because the chlorine can work without fighting the sun's ultraviolet rays and has more time to restore water clarity. 

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Overstabilization: What is it?

While small levels of cyanuric acid (CYA) (20 – 40 ppm) serve an important purpose in protecting chlorine from sunlight degradation, too much can cause problems. Over-stabilization (> 90 ppm) is the buildup of cyanuric acid (CYA) in swimming pool water resulting from the use of stabilized sanitizers and stabilized shock products.  It significantly decreases the effectiveness of chlorine in killing germs, bacteria and algae.




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