Yes, and the difference is significant.
Every piece of equipment you add to a pool increases the number of places where water can accumulate. A standard winterization process treats the pool and the main circulation system. It doesn’t address the specific features of your setup, since the basic procedure doesn’t account for them.
And if your system has a frost protection feature, be aware that it is not a substitute for closing the system. We’ll come back to this later, because it’s the most common source of confusion.
What a standard winterization covers—and what it leaves out
A basic closure system addresses four elements: water balance, water level, the main circulation system (skimmers, return lines, and deep-well intake), and the installation of the winter cover. This is sufficient for a simple pool with a pump, a filter, and nothing else.
The problem is that very few in-ground pools still look like that these days. A water heater, a salt system, or a controller added three years after installation isn’t accounted for anywhere in the original procedure. Yet it’s definitely there, it contains water, and it has to weather the winter just like the rest of the equipment.
What Each Piece of Equipment Requires Additionally
| Equipment | What the winterization process must include |
| Water Heater | Completely drain the heat exchanger, which contains many small passages that can trap water. Shut off the gas or electrical supply. This is the piece of equipment most susceptible to freezing. |
| Automatic dosing pump | Drain and flush the injection lines; remove or protect the measurement probes from freezing; store the chemical containers in a safe place. Any probe left dry or froze ly will need to be replaced in the spring. |
| Salt System | Remove or drain the electrolysis cell, clean the plates before storage, and turn off the controller. A cell that is left full and dirty over the winter may not always be salvageable. |
| Home Automation/Controller | Set to winter mode or shut down completely depending on the model; save seasonal settings; protect the control panel from moisture. |
| Variable-speed pump | Drain the pump housing, and also turn off the electronic drive, which is more sensitive to moisture than a conventional motor. |
| Overflow Pool | Treatment of the buffer tank in addition to the main pool, with its own water level, its own piping, and often its own pump. This is essentially a dual shutdown system. |
| Underwater lighting | Check the position based on the water level and inspect the condition of the seals before winter. |
Protecting your system from freezing isn’t enough
This is the most costly misconception for pool owners.
Many modern controllers and pumps include a freeze protection feature: when the temperature drops below a certain threshold, the system starts the circulation pump to prevent the water from freezing in the pipes. It’s a useful feature, and it does its job well—that is, protecting a pool during an isolated cold night in a mild climate.
Quebec winters are quite different. Freeze protection depends on three elements that must all hold up for five months: a steady power supply, a properly functioning sensor, and a pump that starts every time. A 12-hour power outage in January is enough to render the protection ineffective at the very moment it’s needed most.
A freeze protection system protects during a single cold night. A pool enclosure protects throughout an entire season. They are not equivalent.
“It’s with automated systems that we see the most costly damage, and that makes sense: the more equipment there is, the more water there is to drain. The owner often does a very good basic winterization. What they don’t realize is that their water heater alone required its own separate winterization.” ” — Tristan Dufour, owner, Piscine Évolution
How to Tell If Your System Is Unusual
Go to your utility room and count the appliances connected to the water system. Don’t count accessories—just the appliances through which water flows.
- One or two (pump, filter): Your system is simple; a standard, properly executed shutdown is sufficient.
- Three or four (add a water heater, a salt system): Each additional unit has its own procedure, and shutting down the system is no longer a single operation but a series of steps.
- Five or more, or if there’s a buffer tank: Shutting down your system is a specialized task, and the order of operations matters just as much as the operations themselves.
Here’s another, simpler clue: if you don’t know where the drain plug is on one of your units, it’s probably a sign that it’s never been drained.
Frequently Asked Questions
Yes, in our climate, this is absolutely necessary. Its heat exchanger contains many small passages where water accumulates, making it one of the components most susceptible to freezing in the entire system.
No. It relies on a power supply, a functioning sensor, and a pump that starts up. It protects against a single cold spell, not an entire winter.
This is not recommended. It must be removed or emptied, and its plates cleaned before storage. A salt cell that overwinters while full risks becoming unusable in the spring.
No. The overflow basin has its own water level, its own pipes, and often its own pump. It requires a two-step closing process, with twice as many places where water can remain.
What You Can Do Today
Take inventory. Go to the equipment room, make a note of every piece of equipment through which water flows, and for each one, locate its drain plug. This list is the most useful document you can have on hand before closing down the pool, whether you do it yourself or not.
Every system is different, and that’s exactly why we start by assessing yours. Contact us: we’ll come inspect your equipment and determine on-site the type of shutdown it requires before providing you with a quote. If your system includes automation or specialized plumbing, our home automation and plumbing services also cover those aspects.
