![]() This is fine if your pool has low calcium levels, but terrible if the levels are already ideal. While the chlorine in this shock will eventually die off, the calcium it contains stays present in the pool water. One of the most popular chlorinated shocks is calcium hypochlorite, which contains, you guessed it – calcium! If this occurs, the residual chlorine becomes less effective as a sanitizing agent, and water issues will arise. Too much CYA in the pool can “ lock” the pool’s free chlorine. Non-chlorine shock doesn’t contain CYA, therefore the CYA levels in the pool won’t rise when you use it. Without CYA in the water, chlorine will be eaten up by the sun’s UV rays within a matter of hours. Won’t Increase Cyanuric Acid LevelsĬyanuric acid (aka CYA, aka pool stabilizer) is a sunlight protectant for chlorine. This lack of chlorine also means it won’t produce any combined chlorine (aka chloramines) when added to the water. Similarly, if you’re using bromine, you can use MPS shock and the bromine levels won’t be affected. Won’t Increase Chlorine Levelsīecause MPS shock is an oxidizing agent that doesn’t contain chlorine, the existing level of chlorine in your pool water will remain constant. It’s also pool finish friendly, unlike chlorine which can fade and damage vinyl liners.Īdditionally, non-chlorine shock is ideal for more gentle pools that use a saltwater system. Non-chlorine shock treatment is suitable for all types of pools, whether they’re inground, semi inground, or above ground. It will also stay effective longer as it’s no longer doing both the sanitizing and oxidizing of the pool water pollutants. The free chlorine now has a lighter load and can focus solely on only sanitizing the water. The non-chlorine shock will take care of oxidizing the water, essentially taking half of chlorine’s job off its plate. It allows for the free chlorine (that’s already present in the pool water) to be more efficient at disinfecting the pool. Non-chlorine shock is only an oxidizer, and only destroys oils and organic matter in the water. Remember, chlorine is a 2-in-1 sanitizer and oxidizer. So, if chlorine is imperative to killing nasties in the water, and making it healthy again, why would you ever use a shock that doesn’t contain chlorine? Lightens The Load On Free Chlorine This is when you’ll use chlorinated shock to eradicate every single living organism in the water and simultaneously top up the chlorine level at the same time. It’s at this point where pool water chemistry becomes troublesome, with chloramine, algae blooms, and other unsanitary conditions taking over. If its level dips too low, there won’t be enough of it to keep the pool sanitized. Therefore, after a certain amount of time, it needs to be topped up. So let’s break this down further to clarify when to use chlorine vs non-chlorine shock.Ĭhlorine becomes less effective as it cleans, and sunlight also destroys it. This is an ideal shock alternative for chlorine free pools that aren’t using chlorine as their sanitizer. bags of granular powder (just like chlorinated shock). On the flipside, we have non-chlorine pool shock (aka potassium monopersulfate, or MPS), which is actually an oxidizer that comes in 1lb. When chlorine levels in the pool get low, chlorinated pool shock treatment is added to restore the balance. ![]() When microorganisms, bacteria and organic matter are present in pool water, chlorine goes to work, keeping the pool safe to swim in. What does this achieve? Well, chlorine is both a sanitizer and an oxidizer, and it keeps the water sparkling clean. Traditionally, shocking a pool refers to dosing the pool’s water with a large amount of chlorine. To understand what non-chlorine pool shock does, it’s important to first understand what pool shock is and why it’s used in the first place.
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