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After adding chrlorine to your hot tub for first time to shock pool, use about 150g of baking soda (sodium bicarbonate) to a 1000 litre hot tub to balance the alkalinity level, this will stop your eyes from burning
After adding chrlorine to your hot tub for first time to shock pool, use about 150g of baking soda (sodium bicarbonate) to a 1000 litre hot tub to balance the alkalinity level, this will stop your eyes from burning