Whether you’ve decided to take a break from regular pool usage or are preparing a pool for long-term storage, keeping an unused swimming pool in good condition is essential to avoid future problems. Neglecting a pool during disuse can result in algae growth, staining, equipment damage, and costly repairs. In this detailed guide, we’ll cover everything you need to know to maintain an unused pool effectively, ensuring it remains clean, safe, and ready for use when the season comes back around.
The Importance of Regular Maintenance for Unused Pools
Even when not in use, a swimming pool requires ongoing care to prevent serious issues. Water left untreated can become a breeding ground for algae and bacteria. The lack of circulation can cause chemical imbalances, and stagnant water is more likely to attract insects such as mosquitoes. Additionally, exposure to the elements can damage pool surfaces, filters, and pumps if not properly addressed.
Maintaining an unused pool properly protects your investment and minimizes the effort required to bring it back into commission. Whether you close your pool seasonally or have chosen to keep it unused for an extended period due to renovations or other reasons, understanding the maintenance requirements is key to long-term pool health.
Steps to Safely Close Your Pool for Disuse
Before entering a period of inactivity, it’s important to conduct a thorough closing process. This includes cleaning, balancing chemicals, and protecting the pool against environmental factors. Here’s a step-by-step guide:
1. Clean the Pool Manually and Chemically
Begin by skimming the surface and vacuuming the pool to remove debris, leaves, and dirt. This includes brushing the walls and floor to dislodge any algae or buildup. A thorough clean ensures fewer contaminants remain in the water when it’s left idle.
2. Test and Balance the Water
Proper water chemistry is crucial for preserving the pool. Use test strips or a digital tester to check pH, alkalinity, calcium hardness, and chlorine levels. The ideal pH range is between 7.2 and 7.6, and alkalinity should be around 80–120 ppm. Calcium hardness should be maintained between 200–400 ppm, and chlorine should be around 1–3 ppm.
| Parameter | Target Range |
|---|---|
| pH Level | 7.2–7.6 |
| Total Alkalinity | 80–120 ppm |
| Calcium Hardness | 200–400 ppm |
| Free Chlorine | 1–3 ppm |
3. Shock the Pool
Administering a heavy dose of chlorine—known as shocking the pool—will eliminate any dormant bacteria or algae spores. This is especially important before closing as it sets a clean baseline for water conditions during disuse.
4. Add Stain and Scale Inhibitors
If your water has high mineral content, it’s wise to add stain and scale inhibitors to prevent colored stains from developing on pool surfaces. This is often overlooked but can make a big difference when reopening the pool months later.
5. Drain Water to Required Level
For in-ground pools with solid winter covers, you’ll need to lower the water level below the skimmer to prevent freezing damage. For pools using leaf covers or mesh covers, you can keep water at normal levels, which helps stabilize the cover.
6. Winterize the Equipment
Drain the pump, filter, and heater, and add pool antifreeze to all pipes and lines. Remove plugs from the pump housing and filter and protect all equipment from freezing in winter climates.
7. Cover the Pool
Use a proper winter cover—such as a tarp-style solid cover or a mesh safety cover—for winterized pools. Ensure it’s secure with water bags or anchors. This prevents debris from entering the pool and also provides an added safety layer, especially in households with children or pets.
Maintenance During Periods of Disuse
While a closed pool might seem low-maintenance, there are still several things homeowners should attend to during the inactive months—especially if the pool is only temporarily unused rather than winterized. A few simple maintenance tasks can prevent disaster.
Regular Water Testing and Chemical Checks
Check your pool water every few weeks, especially if it is covered but still partially exposed, or if the pool is located in an area with high humidity or frequent rain. Use a reliable test kit or pool testing strips to monitor pH, alkalinity, and chlorine levels. Adjust chemical amounts accordingly to prevent the growth of algae or bacteria.
Keep the Cover Clean and Secure
Pool covers can accumulate leaves, dust, or standing water over time. This not only puts weight on the cover but can also introduce new contaminants into the pool. Periodically remove debris and sweep or rinse the cover to maintain cleanliness. If using a solid winter cover, remove excessive standing water with a pool cover pump.
Run the Pump Occasionally
If the pool hasn’t been completely winterized, it’s a good idea to run the pump and filter occasionally—about an hour or two per week—to help circulate the water and keep chemicals active. This also prevents the development of stagnant water zones where algae and mosquito breeding thrive.
Inspect for Signs of Damage or Leaks
Keep an eye out for any visible damage to the cover, walls, or structure of the pool. Cracks or tears can allow water ingress and debris into protected areas. If you’re unsure about the integrity of your pool structure, consider consulting a professional for a visual inspection.
Seasonal Considerations in Pool Maintenance
Maintenance tasks may vary depending on the climate and the length of disuse. Here’s how to adapt your approach based on seasonal conditions:
Summer Conditions
- Higher temperatures and sunlight contribute to faster algae growth. Perform more frequent chemical tests and ensure enough chlorine is present.
- Monitor evaporation rates—pools can lose a lot of water during hot summers.
Winter Conditions
Winter maintenance is critical if you live in colder climates. Here’s what to do:
Freezing Temperatures
- Ensure all water is removed from equipment lines and pipes to prevent freezing and potential cracking.
- Use non-toxic pool antifreeze in skimmer lines and returns, as needed.
Snow and Ice Accumulation
Excessive snow on the pool cover can stress seams and put the structure at risk. Periodically remove snow or ice safely without damaging the cover. Avoid using sharp tools for clearance.
Managing Algae Growth and Water Discoloration
Even during disuse, water can quickly turn green or murky. Preventing and managing algae buildup involves targeted cleaning and chemical adjustments before and during non-use.
Algae Prevention Techniques
| Method | Details |
|---|---|
| Regular Brushing | Brush pool surfaces weekly to disrupt algae colonies before they establish. |
| Strong Chlorine Dosing | Perform extra shocks a few weeks before closing to ensure all algae spores are eradicated. |
| Use of Algaecide | Adding algaecide before closing can provide an extra layer of protection against resistant strains of algae. |
Handling Algae Infestations
If your pool water turns green or cloudy while unused, act promptly to restore quality. Begin by brushing the pool walls, testing the water, and shocking with stabilized or non-stabilized chlorine. Depending on the severity, it might take a week or more to clarify the water, particularly if the pump and filter system have been shut off.
When and How to Reactivate an Unused Pool
When you’re ready to make your pool usable again after a long period of rest, you’ll need a strategic process for reopening. Follow these steps to ensure your pool is safe, clean, and in good condition for swimming:
1. Remove and Clean the Cover
Before taking off the cover, inspect the surrounding area for debris buildup. Once removed, rinse the cover to prevent dirt or mold from entering the pool. Store the cover in a dry, dark place to prolong its life.
2. Restore Water Level and Circulation
Refill the pool to its standard operational level, and begin running the pump and filter system. This may need to run continuously for the first 24 to 48 hours to fully circulate the pool water and resume filtration processes.
3. Clean and Inspect Equipment
Before restarting, inspect all equipment for damage or wear. Clean the filter cartridges or clean the sand, depending on filter type. Ensure all valves and connections are open and functioning properly.
4. Test Water and Adjust Chemical Levels
Again, test the pool water using reliable methods to ensure all parameters are within their target levels. Depending on how long the pool was unused, you may have to rebalance multiple chemical levels or shock the water heavily to return to sanitary and safe conditions.
5. Perform a Deep Clean
Brush the pool walls and floor repeatedly over the first few days to dislodge any remaining particles. Vacuum the pool thoroughly once the water is circulating well and chemical levels are stable.
6. Consider Professional Inspection
After years of disuse, it’s a good idea to call in a professional pool service to provide a comprehensive inspection, especially if there are mechanical concerns or signs of staining and tile damage.
Additional Tips for Long-Term Pool Storage
If you plan to keep your pool unused for months or even years, here are a few extra measures you can take to protect your asset and reduce future maintenance demands:
Use Pool Covers with UV Protection
Select a solar or winter cover that offers UV protection to prevent discoloration and degradation of your pool’s interior surface, especially if the pool is located in a high-sunlight area.
Install an Automatic Dosing System
Some modern pools are equipped with automated chlorine feeders or chemical dispensers that maintain consistent chemical levels even when the pool is not being actively monitored. These can be highly beneficial for pools in semi-dormant states.
Consider Pool Liner Covers
If your pool is an above-ground model, a liner cover helps seal moisture out, reducing the risk of wrinkling or fading. This is important for vinyl-lined pools where liner care is critical to durability.
Avoid Draining the Pool Completely Unless Necessary
Unless there are specific reasons like major renovations or freezing risks, it’s generally better not to drain the pool completely. Pools can lose structural integrity, especially if there’s substantial groundwater pressure. Retaining some water helps maintain balance and prevents issues like floating and cracking.
Common Mistakes to Avoid When Maintaining an Unused Pool
Even with good intentions, some pool owners may unknowingly make errors that lead to long-term complications. Here are a few frequent pitfalls you should avoid:
Overlooking Water Chemistry
Failing to test and balance water regularly is a major contributor to algae, staining, and equipment damage. Remember: chemical levels can drop significantly within weeks if they’re not monitored.
Using an Improper or Damaged Cover
A low-quality or ill-fitting cover can cause water to accumulate or allow contaminants to enter. This increases the risk of dirt buildup and pool degradation.
Ignoring Equipment Maintenance
Pumps and filters left unused can accumulate mold or rust over time, shortening their lifespan and reducing efficiency. Proper winterization and occasional inspections go a long way.
Only Cleaning the Surface
Leaves on the water’s surface are easy to spot, but they often settle on the bottom too. Ensure you’re using a vacuum and brush to clean hard-to-reach areas regularly.
Final Thoughts: Key Takeaways for Responsible Pool Management
Managing an unused swimming pool might not seem urgent, but it’s a vital part of pool ownership. With the right approach, you can prevent costly damage, maintain a safe environment, and keep your pool ready for use at a moment’s notice. By understanding the fundamentals of water chemistry, winterizing methods, and best practices for ongoing care, you’ll position yourself to enjoy your pool for many seasons without a hitch.
Proactive Pool Care Yields Long-Term Rewards
Regular testing, debris removal, proper covers, and occasional pump operation are simple steps that prevent expensive repairs and health hazards. Whether you’re prepping for a seasonal break or long-term storage, the effort you invest now will greatly reduce the time, effort, and financial burden required later.
For consistent results, consider consulting a professional pool maintenance company, especially if there are complex mechanical issues or recurring chemical troubles. A little guidance can keep your pool in excellent condition from one opening day to the next—no matter how short or long the break in use may be.
Why is it important to maintain an unused swimming pool?
Even when a swimming pool is not in use, it continues to attract dirt, debris, and algae due to exposure to the elements. Without proper maintenance, water chemistry can become unbalanced, leading to the growth of harmful microorganisms and the deterioration of pool surfaces and equipment. Additionally, stagnant water can become a breeding ground for mosquitoes, posing potential health risks.
Regular upkeep also helps preserve the longevity of the pool’s structure and mechanical systems. Proper water circulation, even minimal, and chemical control prevent long-term issues such as scaling, staining, corrosion, and expensive repairs. Maintaining a pool when unused ensures it remains safe, clean, and ready for use when needed, saving both time and money in the long run.
How often should I check the water chemistry in an unused pool?
Even though the pool is unused, checking the water chemistry at least once a week is recommended. This ensures that pH, alkalinity, and chlorine or sanitizer levels remain within the ideal range to prevent algae and bacterial growth. Occasional shocking of the water may also be necessary if tests indicate imbalance or contamination.
If the pool is fully closed, periodic water testing can be done every two weeks, but this should never be skipped for extended periods. Keeping a consistent log of these tests allows you to identify trends and adjust treatment accordingly. Using test strips or a liquid test kit helps maintain accurate readings, ensuring water remains stable and the pool stays in excellent condition during periods of inactivity.
Should I drain my pool completely when it’s not in use?
Draining a swimming pool completely is generally not recommended unless necessary for repairs or winterization in freezing climates. Pools are designed to hold water, and emptying them can cause structural issues, such as shifting or cracking, due to ground pressure from water in the soil. In areas with high groundwater levels, an empty pool can even pop out of the ground.
Instead of draining, it’s better to maintain the proper water level, which typically covers the skimmer and returns. This protects internal seals from drying out and allows the filtration system to run if needed. Proper winterization or covering the pool appropriately keeps it protected without the need to completely empty it, reducing the likelihood of damage and costly repairs later.
What steps should I take to cover and protect an unused pool?
Using a durable, high-quality pool cover is essential when protecting an unused swimming pool. A solid safety cover is best for long-term closure, especially during the off-season, as it keeps out debris, reduces evaporation, and prevents accidental drownings. Ensuring the cover spans the entire pool surface and is securely fastened using water bags or anchors prevents sagging or wind damage.
Before covering, the pool should be clean, chemically balanced, and properly treated with algaecide or a winterizing kit. If applicable, lower the water level slightly below the skimmer to prevent damage from freezing. For added protection, you might also use automatic cover systems or mesh covers, which allow water and sunlight to pass through but are generally only suitable for short-term use or warmer climates.
How often should I run the pool filter for an unused pool?
Even for an unused pool, it’s important to run the filtration system at least a few hours every other day to keep water circulating and prevent stagnation. Regular circulation helps distribute chemicals evenly, reduces the risk of algae growth, and allows any debris to be caught by the filter rather than settling on the pool floor or walls.
If energy conservation is a concern, running the filter for 2–4 hours every two days can be sufficient. However, during warmer periods or if the pool is partially exposed, increasing filter runtime may be necessary. Alternatively, using a timer or a solar-powered pump system can help automate and optimize energy usage while still maintaining adequate water circulation to protect the pool’s cleanliness.
What cleaning tasks should I perform for an unused pool?
Routine cleaning should include skimming the surface and emptying the skimmer basket regularly to prevent debris buildup. Brushing the walls and floor of the pool every couple of weeks removes early signs of algae formation and prevents dirt from settling. Using a pool vacuum to clean the bottom ensures that your water remains clearer even when unused.
In addition to manual cleaning, you should test and balance the water regularly, as discussed earlier. If debris finds its way into the pool, use a leaf net or vacuum to remove it promptly. Algaecide can also be used periodically to add an extra layer of protection. These tasks combined keep your pool in excellent condition, minimizing the work needed to bring it back into use.
Can I convert my unused pool into a water feature or something else temporarily?
Yes, you can temporarily convert an unused pool into a decorative water feature, garden space, or even an outdoor entertainment zone. Converting the space not only discourages debris buildup but also adds aesthetic or functional value to the landscape. However, it’s important to properly seal and maintain the pool structure during the conversion to avoid damaging the existing liner or tile surfaces.
Before making changes, consult a local expert to ensure any modifications won’t interfere with the pool’s plumbing or future usability. Maintain some level of water treatment or circulation to prevent odors or standing water problems, especially if using a shallow feature. Converting a pool creatively can be a practical and exciting way to utilize the space when not being used for swimming.