Relax Spa Hot Tub Chlorine Granules (500ml)
Stabilised Chlorine Granules
Keep your pool or spa water clean, clear and hygienic with these fast-dissolving stabilised chlorine granules. Ideal for regular dosing, they produce free active chlorine to help kill bacteria and other harmful organisms.
Suitable for both swimming pools and hot tubs, the granules dissolve quickly and have little effect on the pH of the water. They can also be used for shock dosing smaller above-ground pools and spas.
Key Features
Stabilised chlorine granules
Suitable for swimming pools and hot tubs
Rapid dissolving and long lasting
Helps kill bacteria and other harmful organisms
Little effect on water pH
Suitable for regular dosing and shock treatments
Recommended Chlorine Levels
Hot tubs & spas: 3–5 mg/l (ppm)
Swimming pools: 1–3 mg/l (ppm)
Recommended pH: 7.2–7.6
Application Instructions
Test the water and maintain the pH between 7.2–7.6 for the best results.
Maintain free chlorine levels of 3–5 mg/l (ppm) for spas and 1–3 mg/l (ppm) for swimming pools.
If the water temperature is above 20°C, the granules can be applied directly to the pool or spa.
Below 20°C, or if preferred, pre-dissolve the granules in a clean plastic container at a maximum rate of 10g per 1 litre of water. Stir thoroughly until completely dissolved, then add the solution to the pool or spa with the pumps running.
Retest the water and repeat dosing if necessary to achieve the required chlorine level.
For spas, periodic shock dosing is recommended, particularly after heavy use.
Dose Rates
Pool / Spa Size | To Increase by 1 mg/l (ppm) | To Increase by 3 mg/l (ppm) |
1,000 litre hot tub | 2g | 6g |
1,500 litre hot tub | 3g | 9g |
40,000 litre pool | 80g | 240g |
60,000 litre pool | 120g | 360g |
80,000 litre pool | 160g | 480g |
Please always test your water before and after treatment and follow the product label instructions.

