A swimming pool is an investment in fun, relaxation, and overall well-being. However, maintaining it in pristine condition requires some effort. One such effort involves ‘shocking’ your pool to keep it clean, clear, and bacteria-free. But what does it mean to “shock” a pool? And how do you know when and how to do it?
In this post we’ll cover the intricacies of pool shocking, exploring the optimal timing, various shock types, pump operation, and the recommended wait time before diving in.
When to Shock a Pool?
How to Know?
Shocking a pool refers to the process of adding a large dose of chlorine (or other sanitizers) to eliminate algae, contaminants, and combined chlorines. The signs indicating the need to shock your pool include:
Cloudy or Murky Water: Water clarity is an excellent indicator of pool health. If the water becomes hazy or you can’t clearly see the bottom, it’s a signal that bacteria or algae might be growing, indicating a need for a shock.
Strong Chlorine Smell: This is one of the most misunderstood signals. A strong chlorine smell doesn’t mean you have too much chlorine; it’s the opposite. This smell emanates from chloramines, a compound formed when chlorine binds with contaminants.
After Heavy Usage: A crowded pool party or an unusually high number of swimmers can introduce a lot of contaminants into the water, from body oils to sunscreens.
Following Heavy Rain or Wind: These can introduce various contaminants to your pool, from leaves and dirt to algae spores, necessitating a shock.
Regular Maintenance: Even if your pool seems fine, it’s good practice to shock it every couple of weeks during peak usage times to preempt any potential problems.
Steps on How to Shock the Pool
- Test the Water: Before shocking, it’s crucial to test the pool water to know the pH and chlorine levels. Testing kits are available online and at pool supply stores. The ideal pH level is between 7.2 to 7.6.
- Protect Yourself: Chemicals, even when used safely, can be harmful. Always wear protective gloves and goggles. It’s also wise to wear old clothing as splashes can bleach fabrics.
- Prepare the Shock Treatment: Choose a calm day without wind to prevent the shock powder or granules from blowing away. Always shock your pool during the evening or late afternoon since sunlight can degrade chlorine, reducing its effectiveness. Follow the manufacturer’s instructions on the shock product to determine the correct amount needed for your pool size.
- Measure and Mix: Based on your pool’s volume and the manufacturer’s instructions, measure the required shock. Dissolve in a bucket of water, always adding shock to water to prevent any violent chemical reactions.
- Add the Shock: Always add shock to water (not water to shock). Dissolve the granules or powder in a bucket of water and then pour the solution evenly around the pool’s perimeter to ensure even distribution.
- Circulation: Turn on the pump and filter, letting it run for at least 8 hours, preferably overnight, to distribute the shock thoroughly.
Running the Pump when Shocking the Pool?
Do’s and Don’ts when Shocking Pool
- Do run the pump to circulate the shock treatment effectively.
- Do shock the pool during the evening or late afternoon. Sunlight can reduce the effectiveness of chlorine.
- Don’t swim immediately after shocking the pool.
- Don’t mix different types of shock or other chemicals.
Different Types of Products to Shock a Pool
Forms of pool shock products:
- Granules: These are solid forms that you dissolve in water before adding to the pool. They are commonly used and quite effective.
- Powders: Like granules, these need to be dissolved first. They act fast and are often made from powerful oxidizing agents.
- Liquid: Liquid chlorine or liquid shock treatments can be poured directly into the pool. They are easy to apply but may be less potent than granular or powder forms.
Types of pool shock products
- Calcium Hypochlorite: A popular choice, this granular shock acts quickly and contains around 65% chlorine. It also adds calcium to the water, so if your pool already has high calcium hardness levels, use sparingly.
- Dichlor: A stabilized form of chlorine, it’s ideal for pools that get a lot of sunlight as it won’t degrade as quickly. It’s also pH-neutral.
- Potassium Peroxymonosulfate: This non-chlorine shock is an oxidizer that helps in breaking down contaminants. Ideal for those who want to swim soon after shocking, as there’s no waiting period.
- Liquid Chlorine: Often used by pool professionals, it’s easy to apply and acts quickly, but has a shorter shelf life.
Which is Better?
There’s no definitive answer to which type is the best; it depends on your pool’s needs, your personal preference, and specific circumstances. For instance, if you want a fast-acting solution, powdered shock might be preferable. However, for regular maintenance, granules or liquid shock can suffice.
Is Pool ‘Shock’ and ‘Chlorine’ the Same Thing?
No, while chlorine is a primary ingredient in many pool shocks, they are not the same. Regular pool chlorine maintenance is about sustaining levels, while shocking is about addressing immediate, more significant concerns. Pool shock contains a higher concentration of chlorine than regular pool chlorine tablets or sticks. It’s designed to “shock” your pool and quickly raise chlorine levels. There are also non-chlorine shocks available that oxidize contaminants without adding any chlorine.
Using the Pool After Shocking
Swimming Post-Shock:
It’s essential to wait before diving back into the pool after shocking. Typically, it’s safe to swim once the chlorine levels drop below 5 ppm. This can take anywhere from 8 hours to 48 hours, depending on the type and amount of shock used.
Green Pool Post-Shock:
A green pool after shocking is not a sign that you’ve done it wrong. Instead, it’s a sign of iron or copper in the water. The shock oxidizes these metals, turning the pool green. If this happens, consider using a metal sequestrant product or consulting a pool professional.
