April 12, 2018
By Colin Taylor, B.Sc.
For many homeowners, the decision to close their hot tub for the season is not as automatic as it is for most pool owners. Just because the leaves change colours and the temperature drops, it does not mean the hot tub has to be winterized, putting an end to the warm-water therapy season (at least for a few months).
The customer’s choice whether or not to winterize their hot tub is personal and is based on many things. For instance, some may elect to close their hot tub based on whether they are going to be home for the winter, if their hot tub is not located within an enclosure (e.g. gazebo), or if it is not easily accessible via a covered walkway.
However, those customers who want to use their hot tub after the snow has fallen should be provided with the following tips to prevent cracks from developing during the winter deep freeze. These problems can occur when stagnant water expands and contracts in and around the plumbing, jets, and other components after it freezes and subsequently thaws.
This article will help retailers and service professionals explain to customers the proper way to maintain water in their hot tub during the winter—as well as how to close it properly if they so choose. It will also provide important water care tips that should be passed on to the customer that are unique to the winter season and inclement weather.
Even in the cold, hot tub water chemistry should be kept at the same general levels as any other season to ensure the homeowner has an enjoyable bathing experience. When using a test strip, the following readings should be targeted:
It is also a good idea for the customer to add a water conditioner that buffers pH and alkalinity values from week to week, as it can make water care easier in the winter. Keep in mind, sanitizer levels will fall quickly each time they use their hot tub; therefore, the customer should be advised to add chlorine or bromine regularly.
It should also be recommended they use a non-chlorine monopersulfate shock oxidizer every time they exit the hot tub. This will help to neutralize organics such as body oils, as well as prevent unwanted proliferation. Further, it allows the sanitizer to last longer and work more efficiently.
Customers should also pay closer attention to the water temperature in the winter. One way they can do this is to set their hot tub to auto-heat, or other equivalent setting, which will allow it to run for at least 15 minutes every hour. If the client’s hot tub is equipped with a 24-hour circulation pump, this is a moot point because the water is constantly circulating.
The practice of keeping the water temperature consistent is also a more energy-efficient way for them to operate their hot tub in the winter, as opposed to turning the temperature down and then back up again. As a side note, in the event of a power outage, it will take three to five days for a hot tub heated to 40 C (104 F) to completely freeze.
There are several external considerations the customer should be aware of when using their hot tub in frigid temperatures:
For customers who know they are not going to brave the elements and head outside for a soak should be told to keep their water heated, but a much lower temperature than what they would normally set it for bathing.
Most people enjoy their hot tub water at plus/minus 39 C (102 F); however, for customers who have decided not to use their hot tub, they can save energy by turning the water temperature down to plus/minus 15 C (60 F), while also ensuring the circulation pump is operating.
Before the customer takes their last soak of the season, tell them to adjust (balance) the water’s pH and alkalinity. Since the water will not be used, a concentrated shock treatment, along with a winter algaecide, should also be administered.
To ensure the plumbing remains clear, the hot tub owner should periodically run the jet pumps to circulate the water. The latent heat in the hot tub will also maintain a safe temperature to prevent freezing. If the customer’s hot tub has a freeze protection setting, or can be set to filter the water more often, this will do the trick. In many hot tubs, a ‘standard’ setting or ‘F3’ filtration option should keep the water circulating, while most modern units have a built-in sensor that turns the heater on when temperatures dip below freezing.
Even though the hot tub is not being used, evaporation remains an issue—especially in the cold. If the water level drops below the highest jet, it could cause the hot tub to stop working.
In addition to evaporation, maintaining proper water chemistry should still be stressed. While the homeowner’s regular water maintenance routine should wane a bit, as organics are not being introduced to the water, retailers and service professionals should advise customers to periodically check the water and continue to add a sanitizer (e.g. chlorine)—at the very least.
The goal is to keep the water circulated and oxidized. Using a water conditioner will help prevent spikes in pH, which will allow the water to last longer, while total dissolved solids (TDS) will be kept to a minimum. In the spring, the customer can decide whether to drain and refill their hot tub.
Improper winterization methods are the main cause of damage to hot tubs installed in cold-climate regions. Should a hot tub freeze in the winter, the damage that can occur can be quite costly for the consumer to repair.
While some homeowners will attempt to close their hot tub themselves, many prefer to leave this task to their local retailer or service professional. To winterize a hot tub properly, a service professional should follow these steps:
With methodical guidance from a retailer or service professional, those homeowners who take care of their hot tubs over the course of the winter will be happy come spring.
However, a retailer’s assistance does not stop here. Customers should be advised to start the season by topping up their hot tub and performing a plumbing line purge. After purging, the hot tub shell should be cleaned, but make sure the customer uses a cleanser that will not damage the acrylic surface.
Finally, to ensure there is no lingering buildup in the plumbing, the hot tub should be drained and refilled. This step will help remove the winter water and help clean out the maze of plumbing lines that run beneath the unit.
At the start of every season, retailers should remind their customers what water values they should maintain, which are essentially the same year-round. Whichever way the customer chooses to use—or not use—their hot tub, following the procedures outlined in this article will ensure they enjoy a fresh start-up in the spring.
Colin Taylor, B.Sc., MIScT, is a chemist for SilkBalance, a hot tub water care company based in Vancouver, B.C. He has been involved in addressing several hot tub water maintenance problems and focuses on resolving and simplifying them. One example is the reduction of hot tub cleaning time from one day to one hour. Taylor also answers many e-mail questions from hot tub users around the country. He can be reached via e-mail at email@example.com.
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