Chlorine is added in the form of calcium hypochlorite, which is dissolved in water and then poured into the water. Once the pH is right, the next step is to "shock" the pool, which means adding a large amount of chlorine to act as a sanitizer. To raise alkalinity add sodium bicarbonate to the water to reduce it, add muriatic acid or granular acid. When alkalinity is outside this range, it's difficult to control the pH of the water.
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It's also important to retest the pH after adding each additional chemical.Īlkalinity measures the concentration of free alkaline substances in the water, and generally should be between 80 and 120 ppm. If the pH is lower than 7.4, an alkaline product, such as granular soda ash (sodium carbonate), increases it. If the pH is higher than 7.6, use muriatic acid or a granular acid to reduce it. If the pH isn't where it needs to be, any other chemicals you add won't give the right results.Īdjust the pH to between 7.4 and 7.6 before proceeding to the next steps. This is important because pool chemicals are formulated to work at specific pH levels. The first step when treating your pool's water is to adjust the pH. These protect your pool's surface from stains and limescale, and will help keep the pool looking good, as well as reduce maintenance requirements. If you're filling your pool with fresh water, this is a good time to add an anti-stain or anti-scaling product. Most pools will need startup chemicals to adjust pH and hardness, sanitize the water, and prevent algae growth.
The amount of each chemical you need will vary based on the size of your pool and the results of your water tests. This way, you can average out your results to take into account any variations in your readings. It's best to test your pool's water in several spots a couple of feet below the surface of the water.
Your first step when opening your pool is to test your water, because the results of your water tests will determine what pool startup chemicals you need to use. Use this list of the pool chemicals needed for startup to make sure you have everything you need when you get started. When you fill up your new pool for the first time - or when you open your pool after winter - there are some specific steps to take to get the water ready for use.
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