How to Open a Pool for Summer: A Step-by-Step Checklist

Opening your pool properly in spring saves you weeks of cloudy water and wasted chemicals. The order matters: equipment first, chemistry second, swimming last.

What you’ll need

• A pool brush, skimmer net and vacuum
• A test kit that measures free chlorine, pH, alkalinity, calcium hardness and stabilizer
• Liquid chlorine or shock, pH adjusters and alkalinity increaser
• Replacement O-rings or lubricant for pump and filter lids
• Gloves and eye protection

Step 1: Clean and remove the cover

Pump standing water off the cover and brush off leaves and debris before removing it, so the mess stays out of the pool. Clean the cover, let it dry fully and store it folded somewhere dry.

Step 2: Top up the water

Fill the pool to the middle of the skimmer opening.

Step 3: Reconnect and restart equipment

1. Remove winter plugs and reinstall drain plugs, gauges and baskets.
2. Reconnect the pump, filter, heater and any chlorinator.
3. Check O-rings and lubricate them if needed.
4. Prime and start the pump, and check for leaks.
5. Clean or backwash the filter; replace cartridges if they’re worn. Our filter guide explains how each type works.

Step 4: Clean the pool

Skim floating debris, brush the walls and floor, and vacuum. If the water is green, go straight to our green pool guide.

Step 5: Test and balance the water

Balance in this order, retesting between steps:

1. Total alkalinity: 80–120 ppm. See raising alkalinity.
2. pH: 7.4–7.6. See lowering pH.
3. Calcium hardness: in range for your surface.
4. Stabilizer: usually 30–50 ppm outdoors. See our cyanuric acid guide.

Our chemistry chart lists every target.

Step 6: Shock the pool

Opening is the classic time to shock. Use our guide to how much shock your pool needs, add it at dusk and run the pump overnight.

Step 7: Run the filter and wait

Run the pump continuously for 24–48 hours, cleaning the filter when pressure rises. Retest and adjust until the water is clear and balanced.

Step 8: Safety check before swimming

• Check fences, self-closing gates and latches work properly.
• Test door and pool alarms.
• Inspect drain covers for damage.
• Make sure a reaching pole and ring buoy are at the poolside.

Read our full guide to pool safety for families.

Frequently asked questions

How long does it take to open a pool?

The work takes a few hours; getting the water clear and balanced usually takes one to three days.

When should I open my pool?

Many owners open when daytime temperatures consistently reach the high 60s°F (around 20°C). Opening early can stop algae getting a head start.

Should I shock before or after balancing?

Balance alkalinity and pH first, then shock. Chlorine works best when pH is in range.