What Winter Pool Services Should be Performed Pasadena, CA?

Sean Curley • January 20, 2026

Pool Maintenance Is Still Required in Pasadena Despite Mild Winters

Here in Pasadena, California, pool maintenance is fairly unique because our winters are mild enough that you  do not  need to "close" or drain your pool as they do in the East Coast, Midwest, or other cold winter locations. However, because the pool remains open and exposed to the elements, it requires consistent (though reduced) care to prevent algae and equipment damage.


Here are the essential pool services for a Pasadena winter:


1.   Adjusted Filtration & Pumping

Since the water is colder, algae grows more slowly, allowing you to save on electricity due to reduced running time for the pool pumps.


  • Reduce Pump Time:  You can typically cut your pump run time down to  4–6 hours per day  (compared to 8–12 in summer).3


  • Freeze Protection:  Ensure your "Freeze Guard" is active.4  On the rare nights Pasadena dips below freezing, this sensor automatically turns on the pump to keep water moving, preventing pipes from cracking.


2. Chemical Balancing

The colder water in your pool changes the "saturation index" of your pool, which can lead to scaling or corrosion if ignored.


  • Monitor pH and Alkalinity:  We get rain in winter in Pasadena.  Rainwater is acidic and can rapidly drop your pH, which eats away at pool plaster and other elements such as pipes, lines, filters, etc.
  • Lower Chlorine Levels:  You will generally need significantly less chlorine in winter. Aim for  1–3 ppm. Many locals switch from automated chlorinators to simple liquid chlorine or a floating dispenser.
  • Add Algaecide:  A "winterizing" algaecide treatment can provide an extra layer of protection if you plan to use the pool less frequently.



3. Debris Management (The "Windy" Season)

Pasadena is prone to Santa Ana winds and winter storms that dump leaves and organic debris into pools.  This is particularly true in green, leafy Pasadena, Altadena, La Canada, and surrounding areas.


  • Frequent Skimming:  Organic matter (leaves, acorns) left at the bottom can permanently stain your pool's plaster or tile.
  • Empty Baskets:  Check skimmer and pump baskets weekly.6  Heavy leaf fall can clog these, starving the pump of water and causing the motor to burn out.
  • Filter Cleaning:  Winter is a great time for a "Filter Breakdown" (cleaning the DE grids or cartridges), as the system isn't under the heavy stress of summer.


4. Equipment & Cover Care

  • Inspect the Heater:  If you plan on using the spa during the holidays, test the heater early in the season. Rodents often seek warmth in heater cabinets during winter and can chew through wiring.  Rats have been a significant problem recently in the area.
  • Use a Pool Cover:  If you aren't swimming, a cover is the best way to prevent evaporation and keep debris out.7  If it rains, be sure to use a  cover pump  to remove standing water from the top of the cover so it doesn't collapse.8


Pro Tip for Pasadena Residents

If you have  solar heating panels  on your roof, ensure they are drained or bypassed during the coldest weeks (typically January) to prevent the small copper or plastic tubes from bursting during a frost.


Call us at Pasadena Pool Cleaning and Repairs with an wintertime pool maintenance issues or questions.  We can be reached at (626) 605-1956

By Sean Curley November 1, 2025
Required Pool Safety Features
By Sean Curley September 2, 2025
Seasonal Tips For Optimal Maintenance
By Sean Curley June 14, 2025
Are there pool cleaning issues in the Pasadena area?
By Sean Curley April 10, 2025
The Fire Affected Area Poses A New Health Threat
By Sean Curley January 25, 2025
Lucky Enough To Still Have A Home And Pool?
By Sean Curley October 21, 2024
A Comprehensive Overview of Essential Maintenance Tasks
By Sean Curley May 24, 2024
How Do You Get Rid of Ducks In Your Swimming Pool?
By Sean Curley April 16, 2024
This is a subtitle for your new post
By Sean Curley March 28, 2024
Will The Chlorine Hurt Dogs?
By Sean Curley March 2, 2024
For most people, when they look at a swimming pool, they see a pool that looks peaceful and refreshing. It probably doesn’t even occur to them as to how clean the water is. Keeping a swimming pool clean is tedious job because there are several important tasks that have to be done, and done consistently. All year round here in southern California, you need to focus on the (at least) weekly upkeep of the pool. For most people, cleaning it themselves seems like a good idea to save some money. However, it may not be the best idea if you don’t have the time and knowledge to do a thorough job. Typically, if you want it done correctly, its probably best to hire a professional pool maintenance company. How Does One Need to Clean a Swimming Pool? The (at least) weekly maintenance of a swimming pool is necessary to ensure that you have clean and safe water when you want to use the pool. Cleaning a swimming pool cleaning required these steps: Using a net to skim the surface of the water for leaves and debris floating in the pool Brushing off the sediment and possible algae which may have settled on the pool walls Vacuuming the bottom of the pool if needed Removing debris that might have collected in the skimmers Checing that the pump is running Checking the filter and backwashing it as required Testing the water and adding chemicals, such as chlorine, when necessary What Does A Swimming Pool Maintenance Company Do? A professional swimming pool maintenance service will send out an expert technician who understands the ins and outs of pool maintenance. These technicians are usually trained to do tasks related to pool cleaning and maintenance, ensuring that the pool and its water are safe for people to use. Professional can also spot problems with structural issues such as pool leaks and cracks on the pool walls. Proper professional cleaning and maintenance services should include: Deep Cleaning: Most pools in California are outdoor pools. As such, you are bound to have leaves and other natural debris floating in your pool water. In addition to leaves, outdoor pools are likely to collect pebbles, bugs, feathers, or twigs as well. Leaving these items floating in your pool not only makes the pool look dirty, but these items will slowly sink in the pool and lead to clogged pipes, pumps, or filter baskets. This is clearly a case of taking care of problems before they get worse and more expensive to fix. A professional cleaner will first skim the surface of water to clean up large debris, then vacuum the sides and bottom of the pool if necessary to clear out any debris of growth. Chemical Balancing: Keeping the PH of the pool within a certain acceptable range is necessary for proper maintenance. The right pH range for pools should be between 7.4 and 7.6. You might ask, “Why is a proper pH balance for a pool?” If the pool water is acidic, it tends to corrode pool surfaces and equipment. A pool that is too alkaline results in scaling on pool services, causing “green pool syndrome.” Pool usage is a major factor to consider when balancing chemicals. \ Inspecting Pool Equipment: Stagnant water can become home to bacteria, algae, insects, and other micro-organisms. A pool consisting of still, stagnant water it is bound to be attacked by these creatures. However, a combination of the right chemical treatments and a pump to move the water will keep this from happening to your pool. Pumps circulate water preventing stagnation. Swimming pool cleaning services will inspect your pump, and the intake and return valves to ensure they are working properly. What are Some Benefits to Hiring A Professional Swimming Pool Cleaning Service? Managing and servicing your own pool can be satisfying for some, but for most it adds up to a lot of work. You can’t go without frequent pool cleaning and must add the necessary chemicals to the pool. Without this, there can be a risk of infection and other sickness. Some of the benefits of hiring professional pool cleaning services are: Avoiding the spread of disease and infections from the pool: Proper chemical additives and cleaning need to be done to prevent things like E. coli from spreading. E. coli causes most people to have diarrhea but it can be fatal to young children and older adults. A professional pool cleaning service will ensure that the pool is actually cleaned, maintained and water balanced with the right chemicals preventing any spread of diseases. Choosing the right chemicals for the pool: Professional maintenance and cleaning services ensure that the right chemicals, in the right amounts are added to the pool. As trained professionals, they are skilled at what they do, they will make sure that your pool is thoroughly cleaned and maintained germ free. How Frequently should Swimming Pools be Cleaned, and why is it Important? We recommend that a swimming pool is cleaned and chemicals checked at least once a week. The steps should include vacuuming, brushing your pool's walls, steps, and floors to remove dirt and debris, and skiming the water's surface and pool floor. This removes leaves and other organic matter, preventing it from clogging piping, which could result in higher maintenance and repair costs in the future. If you have questions or concerns and are looking for professional pool guidance, then Pasadena Pool Cleaning and Repairs’ services may be the best option for you. We offer affordable, expert swimming pool cleaning, maintenance and repair services that are carried out by trained professionals.