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Durham · Closing season
Pool closing & blowout in Ajax
A closing is plumbing work, not pool maintenance. Here is what Ajax crews charge, what a real blowout includes, and the deadline that keeps your lines intact through a GTA freeze.
Book by late September 1 closing crews in Ajax
Why the blowout is the whole job
Water left in an underground return line expands when it freezes. PVC does not stretch, so the line splits — usually under the deck, where the repair means cutting concrete. Replacing that line in May costs more than ten closings.
In Ajax, frost depth and soil type decide how much margin you have. Ajax pools sit close to the lake, so wind-blown debris and a high water table are the two recurring issues. A spring pump-out before the cover comes off is common, and sump discharge rules mean crews handle the water, not your driveway.
A proper closing also protects the liner and the equipment pad: the filter is drained, the heater is isolated, the pump basket is emptied and the cover is tensioned so snow load is spread rather than pooling in one corner.
What should be included
- Skimmer and pump basket emptied, filter set to waste or bypass
- Water level dropped 6–12 inches below the skimmer — never to the floor on a vinyl pool
- Every return, skimmer and main drain line blown clear with a high-volume blower
- Plugs fitted, then non-toxic antifreeze added to the lines that cannot be fully blown
- Filter, heater and pump drained; drain plugs removed and bagged for spring
- Winter chemical dose: chlorine or algaecide, pH balanced before the cover goes on
- Cover fitted, tensioned and secured; water bags or anchors checked
- Photo report of the equipment pad so the spring crew knows what it is walking into
Do not drain a vinyl-liner pool to the floor. The liner needs water weight to stay seated. Drop 6–12 inches below the skimmer and stop. If the cover is holding standing water, pump it off before it stretches.
Ajax closing costs
| Service | Typical low | Typical high |
|---|---|---|
| Inground closing + blowout | $380 | $650 |
| Above-ground closing | $258 | $468 |
| Safety cover installCover supplied | $2,100 | $4,600 |
| Salt system service | $75 | $180 |
| Standing water pump-off | $150 | $350 |
| Plumbing pressure testWorth it on older pools | $150 | $250 |
Ranges before HST. Parts, liner repairs and hauling are extra.
Prefer to do it yourself? The printable closing checklist walks through every step in order.
The visit
What happens on closing day
A two-person crew usually spends 60–90 minutes on a standard inground pool. Ask for the line-by-line order so you know whether the filter was drained before or after the blowout — the wrong order leaves water in the pump housing.
01
Water level and chemistry
Lower the water, test pH and alkalinity, dose for winter.
02
Blow every line
Skimmer, returns, main drain and any water feature, one at a time.
03
Plug and protect
Fit plugs, add antifreeze, isolate and drain equipment.
04
Cover and report
Tension the cover, secure anchors, send photos of the pad.
Closing crews covering Ajax
Closing FAQ
Before you book in Ajax
Still deciding between a professional closing and a DIY weekend? The Ontario winterizing guide has the full sequence.
How much is a pool closing in Ajax?
Expect $380–$650 for an inground closing with a full line blowout, antifreeze and cover install. Above-ground pools run closer to $266. Safety-cover installation, pumping standing water off the cover and pressure testing are quoted separately.
When should I close my pool in Ajax?
Late September to mid-October. The rule is water below 18°C, not a calendar date. Closing while the water is still warm lets algae bloom under the cover; closing after a hard freeze risks cracked fittings. In Durham, book by the last week of September to get the week you want.
What is a line blowout, exactly?
A blower forces high-volume air through the skimmer, returns and main drain to push water out of the underground plumbing. Then plugs are fitted and antifreeze goes into any section that cannot be cleared. Skipping it is the number one cause of split return lines over winter.
Can I close the pool myself?
Yes, if you own a blower and know your valve layout. The parts cost $150–$250, and a mistake typically shows up as a $1,500–$3,000 spring repair. Most homeowners with a safety cover and a heater find a professional closing cheaper over five seasons.
Pool closing in other cities
Book a Ajax closing before the calendar fills.
Send the pool details once and compare up to three local closing crews. Free, no obligation, and you book directly with the crew you choose.