- Chlorine is one of the most common chemicals used to close and maintain swimming pools. It sanitizes and eliminates blemishes. Liquid chlorine can be used, but granular chlorine is a better option because it is more potent and stable. Chlorine shock treatment is a super-concentrated amount of chlorine added at one time. If you use it, wait three to seven days to finish closing your pool. This will allow the chlorine to return to a safe level before the addition of any algaecides or pool covers.
- Non-chlorine shock treatment is an oxidizer. It is used to control the organic matter and combined chlorine in swimming pool water. Combined chlorine has been compounded by the organic matter, such as ammonia, it is destroying. Combined chlorine becomes increasingly less effective the more it is compounded. Introducing non-chlorine shock allows the existing chlorine to do its job as a sanitizer. Non-chlorine shock does not burn or release chlorine gas. This makes it safer to use and store than chlorinated products.
- Several types of algaecides kill off any existing algae and prevent significant growth while your pool is covered for the winter.
Quats are the most popular, as well as the lowest-prices. They lower the water's surface tension and split the algae cells open. They are applied in small amounts to avoid foaming.
Polyquats are six times stronger than quats. They are used to kill existing algae. Polyquats kill mustard and black algae in addition to green algae.
Copper salts kill existing algae and are used for preventative measures. Using copper can stain your pool over time.
Colloidal silver is very similar to copper. It attaches to pool walls and floors, giving them constant protection. Like copper, silver can stain pool walls if added incorrectly. Silver also kills bacteria, possibly minimizing the need for chlorine.
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