Owning a swimming pool brings with it a wealth of benefits, from relaxation and entertainment to even an increase in property value. However, maintaining a clean, safe, and energy-efficient pool isn’t something that happens by accident. One of the most essential maintenance tools for any pool owner is the pool cover. But here’s the question that many homeowners grapple with: should a pool cover rest on the water?
This article aims to provide a thorough, well-researched exploration of this common query. Whether you’re a new pool owner or seeking to improve your pool care routine, understanding how pool covers should be used is vital for maintaining your investment and maximizing its usability.
Why Pool Covers Matter
Before we dive into the placement of pool covers, it’s important to understand why they’re such a crucial part of pool ownership. Pool covers are more than just protective fabric—they are a versatile solution to a variety of common pool issues.
Key Benefits of Using a Pool Cover
- Reduced evaporation: In hot or dry climates, a pool can lose hundreds of gallons of water each month due to evaporation. A cover significantly slows this process.
- Improved cleanliness: A cover blocks leaves, dust, pollen, and debris from entering the pool, which means less time and money spent on cleaning and filtration.
- Heat retention: Solar covers in particular help retain heat absorbed during the day, keeping your pool warmer for longer and reducing heating costs.
- Enhanced safety: Safety covers, especially in winter, can prevent accidental falls into the pool, making them invaluable for homes with children or pets.
- Extended swimming season: Using a cover can help you open your pool earlier in the spring and keep it open longer in the fall by maintaining water temperature.
Each of these benefits is directly influenced by how the cover is used—including whether or not it should rest directly on the water.
Types of Pool Covers: Understanding the Differences
Pool covers come in various types, each serving a unique function and offering different installation requirements. It’s essential to identify what kind of cover you’re using to determine whether it should touch the water or not.
1. Solar Covers (Bubble Covers)
Solar covers are the most commonly used during the swimming season. They’re designed to warm the water by capturing solar energy and reducing heat loss. These covers are lightweight and usually made from UV-resistant plastic with a bubbled texture.
Placement Guidance:
A solar cover should rest directly on the water surface and float there. Unlike other types, they’re designed to lie on the water to maximize heat absorption and retention. In fact, effectiveness drops significantly if the cover is suspended or not in direct contact.
2. Winter Covers (Safety Covers & Solid Covers)
Designed to protect the pool during the off-season, winter covers are usually made of heavy-duty mesh or solid vinyl. Some are safety-rated, offering rigidity and strength to support the weight of small children or animals.
Placement Guidance:
Unlike solar covers, most winter covers should not rest on the water surface. Instead, they are installed over a winterization system that includes a support system and water bags or springs to keep the cover taut and slightly elevated above the water. This prevents dirt and algae from sticking to the cover and reduces the risk of damage from ice expansion.
3. Automatic and Manual Pool Covers
These permanent or semi-permanent systems are often made of heavy-duty materials and are either operated manually or with an electric motor. They’re a common feature in commercial pools or high-end private pools due to their durability and convenience.
Placement Guidance:
Some automatic and manual covers are designed to rest directly on the water surface, while others are built to sit above it. This largely depends on the design of the cover system. Typically, these systems are water-bearing and can hold a certain amount of water on top without compromising safety or function.
Should a Pool Cover Rest on the Water? The Answer Isn’t One-Size-Fits-All
Now that we’ve explored the different types of covers, it’s clear that the question of whether a pool cover should rest on the water doesn’t have a straightforward yes or no answer. It depends heavily on the cover type, the season, and your specific needs as a pool owner.
When It’s Ideal for a Pool Cover to Rest on the Water
There are certain scenarios where allowing the pool cover to rest on the water surface is not only acceptable but recommended:
- Solar covers for heating and evaporation control: These are specifically made to float and should always be used in direct contact with the water.
- Short-term use (e.g., overnight or between swims): In this case, a solar cover or a thermal blanket can be floated on the surface to minimize temperature loss and reduce evaporation.
- Cleaning and chemical maintenance: If you’re waiting for chemicals to circulate or for the water to settle after shocking, placing a cover floating on the water can prevent debris from getting in during this time.
When It’s Not Recommended for a Pool Cover to Rest on the Water
For certain cover types and situations, letting the cover lie directly on the water can cause more harm than good:
- Winter covers: As mentioned earlier, these should be kept taut and slightly off the surface to avoid water accumulation and potential tearing.
- Mesh safety covers: These are not meant to hold water on top and can sag or tear if left submerged or overloaded with standing water.
- Automatic pool covers with specific installation guidelines: If your cover system is not designed to rest on the water—which is often the case—you should follow the manufacturer’s instructions to avoid damaging the mechanism.
Proper Pool Cover Placement: Best Practices
No matter what type of cover you use, proper placement is key to ensuring its effectiveness and longevity.
1. Use Water Bags or Support Systems for Winter Covers
When using a solid or mesh winter cover:
- Install water bags around the pool’s edge to secure the cover and create a barrier that prevents debris and small animals from getting beneath the cover.
- These water-filled bags also help the cover sit flat but slightly elevated above the water, minimizing long-term contact.
2. Allow Solar Covers to Float Freely During the Season
- Don’t stretch or pin them tightly.
- Ensure they completely cover the water surface without hanging off the edge too far.
- Remove the cover when swimming and place it in a shaded area to extend its life.
3. Keep Automatic and Manual Covers Clean and Dry
- If the system is water-bearing, check that the rollers or support frames are functioning correctly.
- Regularly remove standing water, leaves, and debris from the surface to prevent overload and deterioration.
Debunking Common Myths About Pool Covers and Water Contact
A few persistent myths often misguide pool owners about whether a cover should rest on the water. Let’s set the record straight:
Myth 1: Any Cover Can Be Left on the Water
Reality: While solar covers are designed for direct water contact, others—like winter covers—can degrade or become a safety hazard if installed incorrectly.
Myth 2: A Cover Blocks All Debris
Reality: While covers greatly reduce debris, no cover is 100% foolproof. Rain, wind, and birds can still introduce contaminants. Regular inspection is necessary.
Myth 3: Covers Prevent All Algae Growth
Reality: A cover can limit sunlight, but it does not eliminate algae. Proper chemical balance is the primary defense.
The Science Behind Cover Placement and Water Chemistry
One of the lesser-understood consequences of improper cover placement is its impact on water chemistry. When a cover remains submerged or improperly positioned for extended periods, water chemistry can be altered in the following ways:
1. Trapped Moisture and Algae Growth
Moisture accumulates between folds of a cover or beneath improperly installed covers, especially in winter. This creates a warm, shaded environment perfect for algae growth and bacterial development.
2. Chemical Layering (Stratification)
When a cover is not removed regularly, chemical imbalances can occur, particularly in deeper pools. Chlorine concentrations and pH levels may vary in layers, leading to ineffective sanitization or water clarity issues.
3. Cover-Derived Contaminants
Some covers—especially older or low-quality ones—are prone to leaching chemicals into the water. This is especially concerning during warm weather when covers lie directly on the water for extended periods.
To minimize these risks:
- Inspect your cover regularly.
- Test water chemistry once a week, even when the pool is covered.
- Clean your cover periodically and store it dry.
Choosing the Right Cover for Your Needs
Selecting the appropriate pool cover can be overwhelming due to the wide range of options available. Here’s how to make an informed decision based on your situation:
Consider These Questions Before Purchasing a Cover
| Question | Why It Matters |
|---|---|
| What is the primary purpose of the cover? | Heating, safety, debris prevention, or winterization—each requires a different cover type. |
| What type of pool do I have? | In-ground vs. above-ground pools require different support systems and installation. |
| How long will I be using the cover? | Short-term vs. long-term use determines durability, UV resistance, and flexibility requirements. |
| Will children or pets be around the pool? | A safety-rated cover may be necessary for households with small children or animals. |
Your answers will help you determine if you need a cover that should rest on the water or one that should remain elevated or tensioned.
Maintenance Tips to Extend the Life of Your Pool Cover
Proper use is only part of the equation. Regular maintenance ensures that your cover remains effective and lasts for years.
1. Clean It Regularly
Use a soft brush and mild detergent to wash your cover seasonally or whenever debris accumulates. Rinse thoroughly and let it dry before storage.
2. Repair Minor Damage
Small tears or holes can be sealed with patch kits designed for pool covers. Catching damage early will prevent bigger repairs or premature replacement.
3. Store Properly When Not in Use
Avoid folding tightly or exposing to direct sunlight. Use a cover reel or storage bag in a cool, dry place to prevent degradation.
Final Thoughts: Know Your Cover, Know Your Pool
In conclusion, whether or not a pool cover should rest on the water depends on several factors: the type of cover you are using, your climate, the season, and your intended purpose for the cover. Solar covers thrive on the water, while winter and safety covers benefit from being secured above the surface.
By understanding the design and intended use of your pool cover, you can maximize its benefits—saving energy, keeping your pool cleaner, enhancing safety, and prolonging the life of your cover and pool. Whether you’re looking to retain heat or protect against debris, the right application of your pool cover will lead to a healthier, more enjoyable pool experience.
Take the time to read the manufacturer’s instructions and consult with a professional if unsure. Whether you’re a seasonal swimmer or a year-round pool owner, the right cover used the right way will make all the difference in your overall pool maintenance and experience.
If you found this guide helpful, don’t forget to share it with other pool owners and bookmark it for future reference. Your perfect pool care routine starts with knowledge—and now you have it!
What is the purpose of a pool cover, and how does its placement affect effectiveness?
A pool cover serves multiple purposes, including reducing water evaporation, minimizing debris accumulation, maintaining water temperature, and enhancing pool safety. The way a cover is placed over the pool significantly influences how well it performs these functions. A properly positioned cover can maximize energy efficiency and reduce the cost of pool maintenance.
If a pool cover rests directly on the water surface or is suspended just above it, the effectiveness can vary based on the cover type. Solid safety covers typically should not touch the water, as they are designed to support weight and keep people or animals from falling in. Solar covers, however, are often designed to float on the water to help retain heat and improve water quality.
Should a safety pool cover be in contact with the water?
Safety pool covers are generally not intended to rest directly on the water surface. These covers are usually made of strong mesh or solid material and are designed to sit snugly across the pool’s edge, held in place by water-filled bags, straps, or anchors. Their primary purpose is to act as a barrier that can support the weight of a person or pet, preventing accidental falls into the pool.
If a safety cover is allowed to sag and come into contact with the water, it can compromise both its safety function and durability. Prolonged exposure to water can weaken mesh covers and create a risk of entrapment or slipping. For this reason, it’s essential to keep the cover taut and above water level to ensure it remains effective and long-lasting.
Can a solar cover be left floating on the water when not in use?
A solar cover is specifically designed to float on the surface of the pool water. Its main functions are to retain heat, reduce evaporation, and help keep the water clean by acting as a barrier against debris. Leaving it on the pool when not in use—especially during daylight hours—maximizes these benefits and contributes to more efficient pool heating and chemical use.
However, while solar covers are meant to float on the water, they should be removed periodically for cleaning and inspection. Prolonged submersion under heavy debris or chemical imbalance can degrade the material over time. It’s also important to secure the cover properly to prevent it from drifting or bunching, which can reduce its effectiveness and lead to premature wear.
What are the risks of letting a pool cover sit on the water for too long?
Allowing certain types of pool covers to stay submerged or in contact with the water for long periods can lead to several issues, such as material degradation, staining, and algae growth. For instance, improperly installed safety covers that sag into the water may retain stagnant water pockets, creating a breeding ground for mosquitoes and algae. Mesh covers can become weighed down and potentially tear under the pressure of standing water.
Additionally, prolonged water contact can strain the cover’s seams and fasteners, reducing its lifespan and effectiveness. In the case of automatic or reel-based pool covers, improper tension or alignment caused by constant water contact can damage the mechanism over time. Therefore, regular inspection and proper positioning are necessary to avoid these risks and maintain functional longevity.
How should winter pool covers be positioned—on or off the water?
Winter pool covers, also known as safety covers or seasonal covers, should typically be placed above the waterline to protect the pool during the off-season. These covers prevent rainwater, snow, and debris from entering the pool while keeping it secure and minimizing water contamination. They are usually made with durable mesh or solid material that allows water drainage without full submersion.
If the winter cover is placed directly on the water, it may absorb too much weight from accumulated snow or water, potentially damaging the cover or stressing the support system. To ensure proper positioning, use water-filled tubes, anchors, and a tight fit to keep the cover above the waterline. This method preserves the cover’s integrity while fulfilling its protective role throughout the winter months.
Can an automatic pool cover rest on the water when closed?
Automatic pool covers are engineered to glide over the pool on a set of tracks and are designed to rest slightly above the water surface when properly installed. These covers typically do not make full contact with the water because they extend from one side of the pool to the other and are supported by a sturdy track system. The cover material is firm and water-resistant, intended to shield the pool without sagging.
However, if the automatic cover system is misaligned or worn over time, the cover might droop or even touch the water. This can lead to water accumulation on the cover and potential damage to the motor or track. Regular maintenance and proper tensioning ensure that the cover remains taut and above the waterline, maintaining functionality and prolonging the life of the system.
How should I maintain my pool cover to ensure it doesn’t damage the water or the cover itself?
Proper maintenance of your pool cover is essential for preserving both the water quality and the condition of the cover. Begin by regularly removing debris, dirt, and standing water from the surface of the cover to prevent staining and algae buildup. For covers that come into contact with the water, ensure chemical levels remain balanced to avoid material erosion or discoloration over time.
In addition to cleaning, inspect the cover’s fastening system, seams, and overall structure for wear and tear. Re-tension safety covers as needed to keep them elevated and avoid prolonged water contact. For solar or winter covers, store them properly when not in use to prevent UV degradation, mold, or mildew. A well-maintained pool cover contributes to a cleaner pool and a longer lifespan for the cover itself.