Pool Opening Checklist: From Cover-Off to First Swim

A pool opening done in order takes an afternoon plus two days of filtering. Done out of order, it takes a week and a lot of chemicals. This is the order.

Step 1: clean and pull the cover (do not rush this)

Pump or sweep standing water and debris off the cover BEFORE removing it, the number one opening mistake is dumping a winter's worth of rotten leaves into the pool in the last ten seconds. Clean the cover, dry it, and store it folded with talc or a storage bag; a cover put away wet grows mold that greets you in November (closing steps in the closing checklist).

Step 2: water level and hardware

1. Top the water to mid-skimmer height.
2. Remove winterizing plugs and the skimmer ice guard; reinstall return fittings, baskets, and the ladder/rails.
3. Reconnect or reinstall the pump, filter, heater, and any drained equipment; close drain plugs.
4. Inspect visible plumbing and O-rings; lube O-rings that look dry.

Step 3: prime and start circulation

Fill the pump basket with water, open the air relief on the filter, and start the pump. Bleed air until the relief sprays water, then watch pressure: a clean-start baseline reading is worth writing on the filter with a marker, every "clean the filter at +8 to 10 psi" rule references it. No prime after a minute? Stop and re-check plugs and valves rather than running the pump dry.

Then run continuously for the first 24 to 48 hours. Circulation is the cheapest chemical you own; the schedule can drop to normal (one turnover per day) once the water is clear and balanced.

Step 4: test everything before adding anything

After a few hours of mixing, test alkalinity, pH, CYA, calcium, and free chlorine. Winter rain and snowmelt dilute; a typical spring panel reads low on everything. Resist the urge to shock first, balancing before chlorinating is the whole trick, and the reasoning lives in the chemistry order of operations.

Step 5: balance in order, then chlorinate

1. Alkalinity to 80 to 120 ppm (baking soda, dose via the chemical calculator)
2. pH to 7.4 to 7.6
3. CYA to 30 to 50 ppm (60 to 80 for salt pools), only what the test says you lost, accumulation is the enemy (why)
4. Chlorine: bring free chlorine to target with liquid chlorine via the chlorine calculator; a mild opening shock (8 to 10 ppm) is reasonable insurance even in clear water
5. Salt pools: verify salt AFTER everything dissolves and top up with the salt calculator; run the cell only once the water is balanced and above ~60°F

Step 6: the 48-hour settle

• Brush walls and floor once a day, winter dust feeds algae.
• Retest chlorine and pH daily until they hold steady two days running.
• Clean the filter once after the initial cleanup load.
• Clear + stable + FC under 5 ppm = swim.