The bags are packed, the house is secured, but one question is still on your mind: what will happen to the pool while you’re away?
A well-prepared residential in-ground pool can last 7 to 10 days unsupervised in the middle of the summer season, provided you balance the water, perform a preventive shock treatment and program the pump before leaving. Beyond that, a regular presence becomes necessary: a neighbour, a relative or a professional can then take over. Here’s how to assess the situation and prepare your pool so you find it in pristine condition when you return.
How long can a pool last without maintenance?
In all honesty: it all depends on the heat, the use before leaving, and the quality of the preparation. For an average in-ground pool (40,000 to 60,000 litres), with well-balanced water and a pump running on a timer, count on:
- 3 to 5 days: no risk, even in the middle of a heat wave
- 7 to 10 days: no worries, provided everything was well prepared (balancing, shock treatment, programmed pump)
- Beyond 10 days: monitoring becomes necessary, even in mild weather.
Beyond two weeks, the water can turn quickly. The chlorine dissipates, the pH becomes destabilized and algae move in. Recovering a green pool on your return costs more in products and time than arranging a visit from someone you trust.
What to do before leaving: the essential list
Three days before leaving, perform these steps in order:
- Test the water and adjust the parameters. The pH should be between 7.2 and 7.6. Total alkalinity between 80 and 120 ppm. The free chlorine level between 1 and 3 ppm. Water that is unbalanced at the time of departure will degrade much faster than stable water.
- Perform a preventive shock treatment. A dose of shock chlorine the day before leaving gives the pool a reserve of oxidation that will last several days.
- Clean thoroughly. Brush the walls, run the vacuum or the robot, then empty the skimmer and pump baskets. A pool that is clean at departure will stay that way longer.
- Program your pump’s timer. In peak season, aim for 10 to 12 hours of filtration per day, ideally split into two periods (e.g. 6 h in the morning, 4 to 6 h in the afternoon).
- Cover the pool if possible. A solar or safety cover reduces evaporation and limits the buildup of debris. According to Health Canada, a cover can reduce evaporation by up to 95%, which also helps stabilize the pH.
Should you entrust maintenance to a relative or a professional?
The neighbour who comes by to water the plants can also test the water and add chlorine tablets, as long as they’re a little familiar with this type of product. This solution works for a period of one to two weeks, in the case of a simple pool and outside of a heat wave. For a longer absence, or if the pool has already had trouble (recurring algae, dropping level, a finicky pump), calling on a professional becomes the wiser choice. A targeted weekly visit keeps the water stable, prevents unpleasant surprises and costs far less than an end-of-trip rescue.
“The worst situation is coming home from vacation to a green pool, when the family wanted to swim that very evening. One visit a week during the absence costs a fraction of what we spend afterward to fix the situation.”
– Tristan Dufour, owner and pool expert, Piscine Évolution
Home automation: monitor and adjust remotely
Modern automation systems let you check the pH, chlorine, temperature and flow from a mobile app. You receive an alert if the pump stops working, if the pH drifts, or if a leak occurs. For owners who travel a lot, it’s the investment that turns worry into a simple glance at the phone. To explore the topic further, see our article on home automation for pools.
What to expect when you return
Even with good preparation, plan for 30 to 60 minutes to restart your pool:
- Test and rebalance the water
- Brush and run the vacuum or the robot
- Empty the skimmer and filter baskets
- Redo a light shock treatment if the water looks dull
If you find the water green when you return, don’t panic: it’s often a temporary imbalance that can be fixed in two or three days with a shock, vigorous brushing and extended filtration. If the level has dropped by more than 5 cm without an extreme heat wave, check whether it’s normal evaporation or a real leak.
And if a heat wave hits while you’re away?
Extreme heat accelerates evaporation, drives up chlorine consumption and encourages algae to appear. If a heat wave is forecast, adjust the preparation: a larger shock, a dose of stabilizer, extended filtration to 14 or 16 hours a day. To understand how heat transforms pool chemistry, see our article on heat waves and their effects on your pool water.
Enjoy your vacation. We’ll handle the rest. Preparing a pool for an absence of more than a week takes time, attention and a bit of experience. If you’d rather leave with peace of mind, without handing your keys and the chlorine dosing to your neighbour, our weekly maintenance team can take over: scheduled visit, water tested, adjustments made and photos sent if you’d like. Request an estimate for weekly maintenance, and go on vacation with peace of mind, without worrying about the state of your pool when you get back.
