Opening Your Pool for Summer: Your guide to chemicals
When the weather starts warming up, there’s nothing better than getting your pool ready for summer. But if you’ve never opened a pool before — or you’ve had problems in the past — the process can feel overwhelming.
Proper opening helps prevent costly damage, stops algae and bacteria growth, and extends the life of your equipment. It also saves time and stress during peak season—so your pool is clean, safe, and ready to enjoy when warm weather arrives.
Opening your pool the right way isn’t about dumping in the most chemicals or buying the most expensive products. It’s about understanding the process, using the right materials, and taking simple, cost-effective steps that prevent bigger problems later.
When Is the Best Time to Open Your Pool After Winter?
Early spring, when daytime temperatures are above 10°C but the water is still cool, is the ideal time to start opening your pool. Opening early prevents algae, reduces chemical use, and makes maintenance easier, while waiting too long can lead to green, cloudy water and higher costs.
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Remove, clean and store your winter pool cover.
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Remove any debris in the water.
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Check your pool components for damage and ensure everything is where it should be.
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Refill your pool to the desired water level.
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Turn on your pump and filter.
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Monitor your filter system and check the equipment is working as it should.
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Brush and vacuum the pool using a pool vacuum.
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Test and balance swimming pool chemicals!
Testing Your Water:
It is essential to test your water when opening it for summer as an important first step in getting the water ready for swimming. Over the winter, chemical levels can change and debris or algae may develop, which can affect water quality. By using a testing kit, you can understand its current condition and determine what adjustments or treatments are needed to restore proper balance.
Finding the right Chemicals or Treatment for you:
With all the different names, strengths and information out there, it can be hard to know what to use and when. From our years of experience here is a need-to-know list of the chemicals you need for opening your pool for summer:
Shock (Chlorine Shock Treatment)
A strong dose of chlorine is crucial when opening your pool. Shock eliminates bacteria, algae, and contaminants that may have built up over the winter. Always shock your pool first and let the pump run for 24 hours to circulate properly.
Tip: Test the water 24 hours after shocking before adding other chemicals.
Algaecides
If your pool water presents as cloudy it can often be a sign that algae is starting to grow. While a green tint usually indicates algae, it can also appear as patches around the pool or even as dark spots that look like stains on the pool’s surface. Even if you don’t see algae, adding a preventative algaecide during opening helps stop blooms before they start — especially as temperatures begin to rise.
pH Increaser or Decreaser
Balanced pH is key for swimmer comfort and chemical effectiveness. After testing your pool, you will be able to evaluate your water level ad which treatment is right for you:
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Ideal pH range: 7.2–7.6
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Use pH increaser (soda ash) if levels are low.
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Use pH decreaser (muriatic acid or dry acid) if levels are high.
Chlorine (Sanitizer)
Once your pool is clean and clear, maintain proper sanitizer levels with chlorine tablets, granules, or liquid chlorine. This keeps the water safe and prevents algae from returning.
Our Top Recommended Products
Algae:
Green or Cloudy Water:
Beginner Friendly- algae or cloudy water:
Clean Debris, Muck or Algae:
