It contains added cyanuric acid, making it stable in sunlight. This type of pool shock is safe for all pool materials, as well as saltwater pools and spas. It dissolves rapidly and doesn’t typically cloud the pool water.
Sodium dichlor is a sodium-based granular pool shock. Cal hypo isn’t suitable for fiberglass, vinyl, pebble tec, or painted pools, as it may bleach the surface. However, it’s unstabilized, meaning it doesn’t have added cyanuric acid, so it’s best to use it at night for outdoor swimming pools.ĭepending on the hardness of your water, cal hypo may leave the water a bit cloudy. A granular, calcium-based pool shock, it dissolves quickly in pool water. It’s crucial to know the differences between them and understand when to use each one.Ĭalcium hypochlorite, or cal hypo, is the strongest and fastest-acting pool shock treatment available. There are four primary types of pool shock chemicals: calcium hypochlorite, sodium dichlor, lithium hypochlorite, and potassium monopersulfate. Regularly clean your pool filter with a hose or a DIY pool filter cleaner to remove debris.įlocculants coagulate debris into large clusters that sink to the pool floor for easier manual removal with a skimmer or pool vacuum. Pool water clarifier consolidates particles in the water into small clumps so the pool filter can catch them better. Keep in mind that pool shocking chemicals are not the same as flocculants and clarifiers. It acts as a stabilizer to help the chlorine last longer by protecting the free chlorine from ultraviolet rays. Some outdoor pool owners add cyanuric acid to their pool water. Use a pool test kit to monitor alkalinity.Ĭhlorine also loses potency when exposed to sunlight. With a pH level above 8.0, chlorine quickly becomes less effective. Acidic water (lower than 7.0) is harmful to swimmers and the swimming pool itself. It’s a great way to clean a green pool fast.Ĭhlorine is most effective when water pH level is between 7.2-7.8. This process is sometimes called breakpoint chlorination. The purpose of shocking your swimming pool is to increase the free chlorine levels and eliminate contaminants like chloramines, bacteria, and algae growth. The optimal free chlorine range is between 1.0-3.0 ppm. Make sure you have FAS-DPD test strips that measure free chlorine levels, not just total chlorine. When you use a pool test kit, you measure chlorine and pH levels. During other seasons when pool activity levels are lower, shock your pool once per month. New pool owners sometimes wonder, “How often should you shock your pool?” It depends on how much it gets used.ĭuring the summer months when you’re swimming in it regularly, apply pool shock every week or two. Is Cloudy Pool Water after Shocking Normal?.How Long after Shocking Pool can You Swim?.
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