Hot Tub Maintenance Guide for Toronto Homeowners: Keeping Your Spa Clean Year-Round

Hot tubs require more frequent attention than pools because they hold much smaller volumes of water at much higher temperatures — conditions that accelerate bacteria growth, chemical consumption, and foam buildup. A pool might need chemistry attention twice a week in summer; a hot tub that is used regularly needs attention two to three times per week year-round.

For Toronto homeowners who use their hot tub through the fall and winter, proper maintenance also means protecting equipment from Ontario's harsh winters while keeping the water inviting.

Hot Tub Water Chemistry

The targets for hot tub chemistry are slightly different from a pool because of the high temperature:

• Free chlorine: 3–5 ppm (higher than a pool because heat burns through chlorine faster)
• pH: 7.4–7.6
• Total alkalinity: 80–120 ppm
• Calcium hardness: 150–250 ppm

Test your hot tub at least three times per week if it is used regularly. After heavy use (three or more people, or a party), test and adjust the next morning.

Shocking Your Hot Tub

Hot tubs should be shocked weekly to oxidize organic contaminants (sweat, body oils, cosmetics) that chlorine alone does not fully address. Use a non-chlorine oxidizing shock (MPS) for weekly maintenance — it allows you to re-enter the tub within 15 to 30 minutes. Use a chlorine shock once per month for a deeper sanitization.

Always shock after heavy use and any time you notice foam, cloudy water, or a strong chlorine smell (which actually indicates combined chloramines, meaning there is not enough free chlorine).

Filter Maintenance

The hot tub filter is working harder per litre of water than a pool filter, and it needs more frequent attention:

• Rinse with a garden hose: Every two weeks
• Chemical soak: Monthly (overnight in filter cleaning solution)
• Replace: Every 12 to 18 months

A dirty filter is the most common cause of cloudy hot tub water. If your water is consistently hazy despite good chemistry, clean the filter first before adding clarifiers.

Draining and Refilling

Even with perfect chemical management, hot tub water becomes saturated with dissolved solids (total dissolved solids or TDS) over time. When TDS gets too high, it becomes difficult to maintain chemistry and water clarity. Drain and refill your hot tub every three to four months regardless of how good the water looks.

When draining, clean the shell, jets, and waterline with a hot tub surface cleaner. Inspect the cover, filter, and equipment before refilling. Refill with fresh water and balance chemistry from scratch.

Hot Tub Maintenance Through Toronto Winters

Unlike a pool, most Toronto hot tub owners keep their tub running through winter — a heated soak after shovelling the driveway is one of the pleasures of owning a hot tub in Ontario.

Winter maintenance considerations:

• Check and maintain your cover for insulation integrity — a damaged cover dramatically increases heating costs
• Keep the tub at 36–38°C when in regular use; lower to 30°C in economy mode if not used for a week or more
• Test chemistry more frequently in winter because of shorter testing windows (you are less likely to be checking it daily)
• Clear snow from the cover but avoid scraping it with sharp tools that can damage the vinyl

Professional Hot Tub Cleaning in Toronto and the GTA

CA Pool provides hot tub cleaning and maintenance services across Toronto and the GTA. Whether you need a one-time deep clean, a quarterly drain and refill service, or help diagnosing a chemistry or equipment issue, we can help. Contact us to schedule a service visit.