The Ottawa pool year, from first thaw to final cover.

A properly-maintained Ottawa pool asks for about two hours a week during the season and about a full weekend each in May and October. That is the honest total. If the maintenance is eating more than that, something is probably misconfigured — pump runtime, sanitizer delivery, or water chemistry balance — and it is worth a diagnostic call rather than more work.

April — MayOpening, carefully

Ottawa pool openings happen anywhere from mid-April to late May depending on weather, equipment, and your tolerance for cold water. Rush the opening and you will fight algae for six weeks; delay it and you will lose swim days. The rule most service techs use: open once overnight lows are consistently above about 5°C and the cover water is thawed enough to drain without straining equipment.

Opening day work: remove cover, drain and store it, reinstall skimmer baskets and return fittings, reassemble and prime the pump, run the filter, top up the water level, balance chemistry (pH, alkalinity, calcium, stabilizer, sanitizer — in that order), and let the system circulate for 24–48 hours before anyone swims. A DIY opening is reasonable; a pro opening is worth it the first year until you've seen the system once.

June — AugustThe weekly rhythm

Running the pool well in season is a handful of predictable tasks: test water chemistry twice a week; empty skimmer baskets every second day or after any significant wind; brush the walls weekly; vacuum if the robot hasn't; check sanitizer levels and top up; backwash or clean the filter on schedule; check and top up water level. Pump runtime in Ottawa is typically 8–12 hours a day in peak season, less in spring and fall. Variable-speed pumps at low RPM for most of that cycle use a fraction of the power of a single-speed running on-off.

Opening is optimistic work. Closing is disciplined work. Skip the discipline and the pool will teach you in March.

September — OctoberClosing, thoroughly

This is the part nobody warns first-time Ottawa owners about. Closing a pool here is not a casual chore — it is the single most important maintenance event of the year, and doing it badly can cost you a plumbing line, a heater, or a pump over the winter. The window to close is usually late September to mid-October; close too early and organic debris falls in under the cover, close too late and you risk freeze damage.

Closing day work: balance chemistry for overwinter (higher pH, alkalinity on the high side of normal, shock with a non-chlorine oxidizer), lower water level below the skimmer mouth, blow all plumbing lines clear with a compressor and plug each fitting, drain and winterize the pump and heater, disconnect and store the salt cell if you have one, remove and stow the ladders and fittings, and install the winter cover properly — tightly, with water bags or cover anchors that will not lift in wind. For a first-time owner, pay a pro for the close. After one season watching, DIY is reasonable; before that, do not guess.

November — MarchThe quiet months

Very little to do, honestly, beyond that monthly cover check. Some owners plan equipment repairs or upgrades in January and February while the pool is idle — replacing a heater or rebuilding a pump is easier in off-season, and installer calendars are open. If you know something will need attention next season, deal with it now rather than during the opening rush.