Choosing the Right Pool Shock


The amount of pool chemicals on the market can be overwhelming at times. Sanitizing your pool, for example, can be especially confusing. There are many products available, most of which have a different chemical composition. They all sanitize your pool, so why is there a difference and what product does the bet job?

The answer to that question is simply, “It depends”. There are so many variables to take into account when talking about sanitizing your pool that it does not make sense to say that only one type of pool shock is the best.

Under certain circumstances though, there are products that are ideal, and that’s what we’re here to find out about.

Leslie’s offers many types of pool shock, but we’ll just focus on the most popular.
Power Powder Plus is the most popular shock that Leslie’s sells. Composed of calcium hypochlorite, Power Powder Plus provides 65-70% available chlorine that effectively sanitizes the pool and kills bacteria, algae, and other contaminants.

Calcium hypochlorite also does not contain any cyanuric acid (CYA), and will therefore not raise the levels of CYA in your pool. However, this means Power Powder Plus will burn off faster if added during the day because the CYA is not protecting the chlorine from the sun.

Power Powder Plus is safe for all pool types, but may cause bleaching on certain surfaces.
In larger quantities, this shock is effective at killing algae.

Use this if…
You have a plaster pool and need a strong, chlorine-based shock.

Chlor Brite Granular Chlorine is a good option for people who have an above ground, vinyl, fiberglass, pebbletec, or painted pool because of the quick-dissolving nature of the product. Because the granules dissolve quickly, Chlor Brite will not sit on the bottom of the pool and cause staining.

Composed of 99% sodium dichloro-s-triazinetrione (also known as dichlo), Chlor Brite provides 56% available chlorine, the highest of any dichlo product on the market.

Chlor Brite is also advantageous because the product does not add any calcium to your pool. Calcium introduced into the pool will increase your Calcium Hardness Level and over time can have a negative effect on your pool surface and equipment.

Use this if…
You do not have a plaster pool and want to prevent staining, but still want a strong chlorine-based shock.

Fresh N’ Clear is a slightly different form of pool shock, in that it does not contain chlorine and it acts as a clarifier. This product is considered an oxidizer, because it uses oxygen to eliminate contaminants and organic waste, among other things. These can interfere with free chlorine in the pool because they help create combined available chlorine (CAC). CAC produces the chlorine smell that many people find in pools.

The main disadvantage to using Fresh N’ Clear compared to a chlorinated shock though is that Fresh N’ Clear does not kill bacteria and other microorganisms that can be present in the pool. These can only be killed chlorine. Fresh N’ Clear relies on using oxygen to free up CAC, which can then be used to target the bacteria and microorganisms.

Also, because there is no chlorine, it is safe to swim only 15 minutes after the use of this product.

Use this if…
You want to have a clean pool without using a chlorine-based shock.