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Pool in Spring: Complete Checklist Before the First Swim

11 May 2026

Two people remove the winter cover from an inground pool in spring before cleaning and opening.

With the return of nice weather on the South Shore of Montreal and in Montreal, it is time to think about opening your pool. After several months of winter, a proper restart is necessary to avoid unpleasant surprises and quickly enjoy clean and safe water.

Here is a complete checklist to successfully open your pool and start the season off on the right foot.

Why properly prepare the opening of your pool?

A good pool opening allows you to:

  • Prevent green water and algae
  • Protect your equipment (pump, filter, water heater)
  • Reduce long-term maintenance costs
  • Ensure healthy water from the first swims

In short, the more rigorous you are in spring, the fewer problems you will have during the summer.

1. Remove the cover and clean the debris

First unavoidable step of any pool opening:

  • Remove the winter cover carefully
  • Clean it before storing it away (prevents mold and odors)
  • Remove the leaves, branches and debris accumulated in the pool

Tip: use a skimmer net to prevent the debris from sinking to the bottom.

2. Inspect the condition of the pool and equipment

Before restarting the system, take the time to check:

  • The condition of the liner (cracks, tears)
  • The skimmers and drains
  • The seals and fittings
  • The pump and filter

A quick inspection can prevent costly repairs in the middle of the season.

3. Bring the water level back to the right height

The water level should generally be:

  • Halfway up the skimmer

If necessary, fill the pool with a garden hose before restarting the system.

4. Reconnect and restart the equipmentPool pump and filter system reconnected in spring to restart filtration before swimming.

A key step in pool maintenance:

  • Reconnect the pump and filter
  • Open the valves
  • Prime the pump
  • Check that there are no leaks

Let the system run for several hours to properly filter the water.

5. Deep clean the pool

Before treating the water:

  • Brush the walls and the bottom
  • Vacuum
  • Clean the skimmer baskets

This allows you to eliminate impurities before adding the products.

6. Test and balance the waterPool water testing products and test strips used in spring to balance the pH before the first swim.

Good pool maintenance goes through well-balanced water:

  • pH: between 7.2 and 7.6
  • Alkalinity: 80 to 120 ppm
  • Chlorine: according to the recommendations

Use test strips or a test kit to adjust the levels. If you have any doubt about the results or the quantities to add, it may be wise to go see the POSEIDON specialists to get the right advice and the dosage adapted to your pool.

7. Do a shock treatment

Necessary during the pool opening:

  • Add a shock treatment (chlorine or other disinfectant)
  • Let filter for 24 to 48 hours

This eliminates the bacteria accumulated during the winter.

8. Check the heat pump and accessories

Before the first swim:

  • Test the heat pump
  • Check the ladder, the lights and the accessories
  • Inspect the safety systems

9. Set up a maintenance routine

Once the pool is open:

  • Daily filtration
  • Weekly cleaning
  • Regular checking of chemical products

A good routine greatly simplifies the maintenance of your pool throughout the summer.

When to call on a professional?

Even with a good checklist, certain situations require the help of experts:

  • Very dirty or green water
  • Pressure or filtration problem
  • Leak or equipment breakage
  • Lack of time or experience

On the South Shore of Montreal and in Montreal, calling on a specialized service can save you time and avoid many mistakes.

Ready for the first swim?

Pool opening is an unavoidable step to fully enjoy the summer. By following this complete checklist, you put all the chances on your side for clear, clean and pleasant water from the first hot days.

Need help with your pool opening or your pool maintenance on the South Shore of Montreal or in Montreal? Call on the professionals at Piscines et Spas POSEIDON for fast and efficient service.

 

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