Set the reminder for two weeks before the first day you want to swim. Pool opening isn\'t a single Saturday job — it\'s a chemistry rebalance, a multi-day filter run, and a shock cycle. The buffer is the whole point.
Follow them in order. The chemistry sequence matters; the rest is just sensible.
Sweep off leaves, branches, and standing water before you remove anything. A cover pump makes draining surface water faster than a shop vac.
Lay it out, hose it down, scrub the underside, let it dry fully, then fold and store. Storing a wet cover is how you get mildew that ruins next year\'s opening.
Bring the level back to the middle of the skimmer opening. Filling to the right level before chemistry makes balancing easier.
Reinstall drain plugs, return jet eyeballs, ladders, and skimmer baskets. Inspect each fitting for cracks from winter freeze.
Fill the pump basket with water, replace the lid, and start. Listen for cavitation — air in the lines means a leak somewhere upstream.
Get a baseline on free chlorine, total alkalinity, pH, calcium hardness, and cyanuric acid. Use a fresh test kit; strips that wintered in the shed give bad readings.
Add sodium bicarbonate to raise it. Wait 6 hours and retest before moving on. Alkalinity stabilizes pH, so it has to come first.
Add soda ash to raise, muriatic acid or sodium bisulfate to lower. Retest after 4 hours of circulation.
Calcium chloride raises it; partial drain and refill is the only practical way to lower it. Skip this step if you\'re in the target range.
Add a heavy dose of chlorine — typically 3x normal — to oxidize organic matter that built up under the cover. Do it in the evening so sunlight doesn\'t burn it off.
Continuous run, no exceptions. Backwash or rinse the filter once during this window if pressure climbs. Add clarifier if water is still cloudy after 24 hours.
Once free chlorine is in the 1–3 ppm range and water is clear, you\'re back on the regular weekly schedule. Set a recurring weekly reminder if you don\'t already have one.
Two weeks before the day you actually want to swim. Not the day-of, not the morning of — two weeks. Opening day is the start of a process, not the end of it. Chemistry takes time to settle, the filter has to clear water that\'s been still for months, and any equipment problems show up in those first 24–48 hours of running the pump.
For Memorial Day weekend, that means a reminder for the second week of May. For an early June trip, late May. The reminder is the buffer. If you wait until Friday afternoon to start, you\'re swimming in cloudy water on Sunday — or not swimming at all.
Once the pool is open, switch to the weekly maintenance checklist and the recurring weekly reminder covered on the main pool maintenance page.
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Removing and cleaning the cover, topping off water, reconnecting and starting equipment, balancing alkalinity then pH then calcium, shocking the pool, running the filter 24 hours, and clearing any cloudiness with a clarifier. Plan on the whole process taking a week or two before the water is swim-ready.
Total alkalinity first, because it stabilizes pH. Then pH itself. Then calcium hardness if it's low. Then chlorine and a shock treatment. Adding chlorine before alkalinity and pH are correct wastes the chlorine and can damage equipment.
When daytime temperatures consistently hit the 65–70°F range — typically late April in the upper Midwest and Northeast, mid-March in the mid-Atlantic, and February or year-round in the South. Opening earlier than that doesn't hurt anything; the water just stays cold. Opening too late lets algae start under the cover.
The hands-on work is 2–3 hours. The full process — chemistry rebalancing and filter runs to clear the water — takes 5 to 14 days. Plan on a two-week buffer between opening day and the day you want to actually swim.
For a brand-new plaster pool, yes — the plaster needs roughly 28 days to cure properly, and aggressive chemistry during that window damages the surface. For an existing pool you're opening for the season, no. Once chemistry is balanced and chlorine is in the right range, the water is safe.
You can do it yourself. The steps are straightforward and the chemicals are widely available. A service makes sense if you've never opened a pool before, your pool has gas heating you don't know how to relight, or you simply don't want to spend the time. Costs run $200–500 for a typical inground pool.
Two weeks of buffer is the difference between swimming on opening weekend and waiting another week. Set it once and forget the date.
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