Pool Opening Checklist: First Spring Steps
Updated 2026-05-21
Opening the pool in spring is the most important week of the season. The order of operations matters more than the time spent. Skip steps, and you spend the next month fighting algae and cloudy water. Here is the checklist that prevents that.
Step 1: clean the cover before removing
Sweep leaves and debris off the cover with a brush. Pump off standing water with a cover pump or wet-dry vac. Do not let the dirty water and debris fall into the pool when you pull the cover.
Once clean, remove the cover carefully and lay it flat to dry before folding for storage.
Step 2: inspect and reattach equipment
Reinstall pump baskets, skimmer baskets, ladder, drain plugs, and pressure gauge. Lubricate o-rings with pool-safe silicone lubricant. Inspect the filter for cracks and the pump for leaks.
Reconnect the heater if you have one and run it for 5 minutes to check for proper ignition.
Step 3: top up the water level
Fill the pool to the middle of the skimmer opening. Too low starves the pump and too high reduces skimming effectiveness.
Step 4: start the pump and circulate
Prime the pump (fill the basket with water before turning on) and start circulation. Run for at least 24 hours to mix the winter chemistry layers.
Once the water is moving, test all parameters: free chlorine, pH, alkalinity, calcium hardness, and CYA.
Step 5: balance, then shock
Adjust alkalinity first (target 80 to 120 ppm), then pH (target 7.2 to 7.6). Adjust calcium hardness if below 200 ppm or above 400 ppm. Adjust CYA last (target 30 to 50 ppm).
Only after balance is in range, shock the pool with Cal-Hypo at 1 to 2 pounds per 10,000 gallons. Run the pump 24 hours.
Step 6: clean and watch
Brush and vacuum the pool surfaces once the shock has done its work. Backwash or clean the filter. Watch chlorine over the next 48 hours: if it drops back to zero, there is still organic load to break through and you may need a second shock.
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Get PoolSenseFAQ
Should I drain the pool before opening?
No, unless the water is dark green and unrecoverable. Most pools open and clear with shock plus filtration. Draining is expensive and risky to the shell.
How long does pool opening take?
Active work is about 3 to 4 hours. Total time including chemistry balance and circulation is typically 3 to 5 days before the pool is swim-ready.
Why is my pool still cloudy a week after opening?
Usually one of: insufficient shock dose, filter still dirty from winter, or CYA out of range blocking chlorine effectiveness. Re-test all parameters and run a second shock if chlorine is below 3 ppm.