Rapid Shock is a Non-Chlorine Shock Treatment for spas and hot tubs. Highly concentrated, fast-dissolving oxygen compound that reduces and eliminates combined chlorine levels Fast-acting and a spa or hot tub may be used only 15 minutes after dosing. Used regularly it improves sanitiser efficiency. It also contains a clarifying agent creating extra sparkle. It may be used as a non-chlorine shock for hydrogen peroxide systems and for ornamental ponds and fountains Please Note: Not recommended for use with bromine-based sanitizer DIRECTIONS FOR USE:Sprinkle the required dosage over the surface of the water with the pump and filter turned on.Rapid Shock will dissolve within 2-3 minutes. DOSAGE: Initial Dose:75gm of Rapid Shock per 1000 litres water Regular Dose:50gm of Rapid Shock per 100 litres water Any advice or suggestions above, including but not limited to instructions and dosing rates are intended to be a guide only. Please read the full instructions on all chemical containers. We will not accept responsibility for the use of these products.