Shocking a spa is when we dose the spa water with chlorine (sodium dichlor) or non-chlorine shock (potassium monopersulfate or MPS).
Spa Shock breaks down any organic waste contaminants existing in the water and prevent the water from being overrun by contaminants. Shocking a spa is where we add a large dose of oxidiser to “shock” the water, removing contaminants from the water effectively, and prevent cloudy water. Spa shock kills bacteria, removes contaminants and also removes chloramines or bromamines from the water.
There are two different types of Shock suitable for spas.
Dichlor The first is a chlorine based shock (Sodium Dichlor). The technical terms is sodium dichloro-s-triazinetrione or dichloroisocyanuric acid.
Dicholor is the most commonly used active ingredient in spa shock. Dichlor can be directly to the spas water without having to dissolve it first. Always make sure however to follow the manufacturer’s instructions.
Dichlor is stabilised so it can withstand the spa waters heat. That being said it's best to add it to your spa at dusk or at night to prevent the sun Dichlor increases your sanitizer levels as well as shocking the water The second form is a non-chlorine shock called potassium monopersulfate. or MPS) which is purely for oxidizing the water.
The most common active ingredient in Non-Chlorine Shock is potassium peroxymonosulfate. Non-Chlorine Shock is an effective oxidizer when used weekly. It removes organic contaminants such as skin cells body lotions and will effective clearly cloudy water caused by those contaminants. if you are using a chlorine or bromine as a sanitiser, adding Non-Chlorine Shock also activates free chlorine which will kill any bacteria in the water.
The type of Spa Shock to use will depend on the type of Spa Sanitiser you are using. It's best practice to use the associated line of products for your Biguanide Sanitiser - Biguanide based oxidiser, water clarifier and test strips. These products will be designed to work most effectively for that Sanitiser system.
If you are using Biguanide Sanitiser it's best to use a Biguanide spa shock. The active ingredient will be a hydrogen peroxide, that has been designed exclusively for use in spa water.
If you are using a Bromine Sanitiser you can use either chlorine shock or a non-chlorine shock. If you expect a lot of contaminants in the water consider using chlorine shock for maximum protection.
If you are using a chlorine sanitiser use a chlorine based shock. You can also use non-chlorine shock you'll just need to add it more frequently to remove organic contaminants and keep your spa water crystal clear. Again if you expect a lot of contaminants in the water it's a good idea to stick with chlorine spa shock to kill bacteria and keep the water sanitary.
Shocking your Spa water is a fairly straight forward process. Follow the steps below for the most safe and effective spa shock result.