Opening a swimming pool cover may seem like a straightforward task, but when the cover is weighed down by water, it introduces a unique set of challenges. Whether you’re preparing your pool for the swimming season or dealing with unexpected water accumulation during maintenance, knowing the do’s and don’ts of opening a pool cover with standing water is crucial to protecting your pool equipment, ensuring safety, and maintaining your pool’s overall health.
In this guide, we’ll cover everything from the underlying physics to the best practices for safely removing water from your pool cover. We’ll also explore best tools for the job, maintenance tips, and how to avoid costly mistakes.
Why Is Water on a Pool Cover a Problem?
A pool cover, whether it’s a solid safety cover or a mesh winter cover, is designed to protect your pool from debris, evaporation, and environmental elements. However, when water accumulates on the surface, it can have several undesirable effects:
1. Additional Weight Beyond Design Limits
Pool covers are tested and designed for specific weight tolerances. Standing water significantly increases the load, which can strain the cover’s seams, anchors, and grommets. Excess water pressure can lead to permanent stretching, tears, and even structural failure of the cover itself.
2. Risk of Water Entering the Pool
When you open a cover weighed down with water, there’s a risk that water could spill over into the pool, bringing in dirt, leaves, and contaminants. This dramatically increases the effort needed to clean and balance pool chemicals later.
3. Safety Hazards
Standing water can create slipping hazards, especially around the pool’s edge. Additionally, if the water becomes deep enough to pose a risk of entrapment or drowning, it could endanger children, pets, and even adults.
The Science Behind Water on Pool Covers
Understanding the basics of physics involved in standing water helps you make informed decisions when managing your cover:
1. Surface Tension and Weight Distribution
Water’s surface tension causes it to pool into low-lying areas on the cover. Once a depression forms, gravity pulls more water into that area, creating a self-perpetuating buildup. This can cause the center of the cover to sag dramatically.
2. Load Transfer Mechanics
The water’s weight applies compressive force downward on the cover. This force translates to the anchors and fastening points, increasing the strain on each securing mechanism. In extreme cases, parts of the cover can pull free from their attachment points.
3. Volume and Pressure Calculations
A good rule of thumb is that a square foot of water 1 inch deep weighs about 5 pounds. If your cover has 25 square feet of pooled water, 2 inches deep, that’s potentially 250 pounds of pressure. This is far beyond what many pool covers are designed to carry safely.
Preparation Before Opening the Cover
Before attempting to remove water from the cover, or opening it entirely, safety and preparation are paramount. Here’s what you need to do:
1. Assess the Water’s Depth and Coverage
Use a measuring stick or float to estimate how much water is sitting on the cover. As a general rule, if you’re dealing with more than 1 to 2 inches of water across a large portion of the cover, you should remove it before attempting to open the cover.
2. Gather Tools and Equipment
You’ll want to have the following items ready:
- Submersible sump pump
- Manual water lift or pump
- Stiff broom or brush
- Pool cover pump (automated or solar-powered)
- Rubber gloves and protective footwear
3. Secure the Area Around the Pool
Clear away any loose objects near the edges that might interfere with lifting the cover or cause injury during the process. Make sure the deck and surrounding flooring are dry to reduce slip risks.
Safely Removing Water from the Pool Cover
Now that you’re prepared, let’s go over the most effective methods to remove water from the cover.
Step 1: Use a Pool Cover Pump
The most efficient method is using a dedicated pool cover pump, which can be automated or manual. A solar-powered pool cover pump offers energy efficiency and minimal maintenance. These pumps typically have a float mechanism that activates them when water reaches a certain level.
Step 2: Manual Draining with Submersible or Manual Pump
If you don’t have a cover-specific pump, a submersible sump pump works well—make sure its hose leads water away from the pool area to avoid reaccumulation.
For smaller volumes of water and shallow puddles, a manual water lifter (a hand-operated siphoning tool) is both effective and affordable.
Step 3: Brush Off Excess Water
Once most of the water is removed, use a stiff broom or brush to push smaller puddles or residual water toward the drain hose or off the edges. Be gentle—aggressive brushing can damage the cover materials or strain fasteners still in place.
Step 4: Inspect for Remaining Water Pockets
Walk (barefoot, for sensitivity) across the cover to find “bubbling” areas where water may still be trapped under folds. These should be addressed before attempting to open the cover fully.
Removing the Pool Cover Safely
Once the water is efficiently removed, you can proceed to open the cover and prepare the pool for use.
1. Detach the Cover According to Manufacturer Instructions
Different pool covers attach to the pool edges and surrounding deck in various ways—from straps and anchors to water bags or spring systems. Refer to your cover’s installation manual to understand the proper sequence and technique to unattach the cover.
2. Use Proper Techniques for Manual or Automated Removal
If you have a roller system, use the provided handle or motor to slowly unroll the cover. For manual lifts, ensure you’re working with assistance to evenly lift the cover and prevent damage. Never attempt to rip or forcefully tear a stuck or damaged cover.
3. Clean and Store the Cover Properly
Once removed, clean the cover thoroughly using a mild detergent and soft brush to prevent mold growth or debris accumulation. Lay it flat (avoid folding in the same places each time) or hang it in a dry, ventilated storage area. If space is an issue, use a cover bag for protection from pests and moisture.
Special Considerations Based on Cover Type
Not all pool covers are created equal. Here’s how the water removal process changes based on the type of cover you have:
Solid Safety Covers
Designed to prevent entry into the pool, solid safety covers often come with a flat surface and are secured with anchors and springs. They require careful water removal and often offer central drain points. These covers should always be opened after removing all standing water.
Mesh Winter Covers
Permeable to rain and meltwater, mesh winter covers are less prone to water accumulation but still subject to it during heavy rainfall or snowmelt. You can still use a pump to remove standing water before removal, but since mesh allows some drainage, you may have less to remove compared to solid covers.
Automatic Safety Covers
Also known as “motorized safety covers,” these require advanced attention. If water is left on these, it can add immense strain to both the motor and frame. Remove water promptly, and follow the manufacturer’s protocol for operation after rain or snow.
Best Practices to Prevent Water Accumulation
Avoiding frequent water buildup can save significant time and effort:
1. Maintaining Proper Tension
Use a cover pump regularly during rainy or snowy periods. Also, check tensioning springs and fasteners to ensure the cover remains taut. Taut covers naturally shed water more effectively.
2. Installing Cover Supports and Domes
Some pool owners use water domes or cover lifts that create tensioned peaks where water can’t settle. This passive approach is ideal for long-term winter protection.
3. Upgrading to a Solar-Powered Cover Pump
Solar pumps offer continuous, green energy operation. They’re especially useful in regions with high rainfall and can be a reliable long-term investment for frequent pool users.
When to Call in the Pros
Some situations might require professional assistance:
1. Severe Water Damage or Drainage Issues
If the cover has been soaked for weeks or structural damage is evident, a professional’s assessment is recommended.
2. Complicated Removal for High-End Covers
Automatic covers, motorized systems, and high-end winter covers often have features designed for specific technicians. Call on certified contractors to avoid voiding warranty or damaging your equipment.
3. Mold, Mildew, or Chemical Treatment Concerns
Excess moisture can lead to mold or bacterial growth, especially in shaded, humid environments. If you encounter persistent stains or smells post-removal, professional cleaning may be essential.
Seasonal Advice for Pool Cover Maintenance
To keep your pool cover in good condition year after year, consider seasonal checklists:
Spring Preparation
– Drain water as winter ends
– Clean the cover
– Repair any holes or torn areas
– Let air out any cover storage bags
Summer Storage
– Rinse once at mid-season, if in use
– Do not store in humid areas
Fall Installation
– Check fasteners and grommets
– Stretch to ensure it’s even and secure
– Attach pump in advance of rainfall
Winter Monitoring
– Check weekly during snow events
– Operate solar or automatic pump regularly
– Watch for snow-load issues in cold climates
Common Mistakes and How to Avoid Them
Avoid these common yet preventable missteps:
1. Opening the Cover Without Removing Water
This can lead to back strain, cover tearing, and unintentional contamination in the pool.
2. Using Incorrect Tools (e.g., Garden Hose to Pump Water)
While tempting, using low-pressure devices like garden hoses or wet vacuums without suction strength can delay drainage and cause damage.
3. Skipping Clean and Storage Steps
Mold, fading, and physical degradation can appear within a single neglected season if a cover is not properly dried and stored.
4. Repeated Use of Damaged Covers
Small tears or stretched material can expand under pressure during the next installation season.
Conclusion: Handle Water on Your Pool Cover with Care
In conclusion, while it is technically possible to open a pool cover that has water on it, doing so safely and effectively requires preparation, the right tools, and attention to detail. Ignoring the presence of water can lead to expensive pool maintenance issues and potential safety hazards. Whether you use a submersible pump, manual water lifter, or automated system, your long-term goal should be to prevent water accumulation when practical.
By following a consistent maintenance schedule, ensuring proper tension, and inspecting your cover each season, you can prolong its lifespan and keep your pool in optimal condition. Remember, a small investment in time today can save you significant costs and hassle tomorrow.
So the next time you’re preparing to open your pool, take a moment to assess what’s on top of it—and if there’s water, handle it like a pro!
Can you open a pool cover with water on it?
Opening a pool cover with water on it is possible but not recommended due to potential safety and maintenance concerns. Standing water can significantly increase the weight of the cover, making it difficult and dangerous to remove. Additionally, it can create slipping hazards during the removal process, increasing the risk of injury.
From a maintenance standpoint, leaving water on the pool cover for extended periods can lead to mold, mildew, and deterioration of the cover material. It’s also more challenging to properly clean and store the cover afterward. The best practice is to remove any standing water before opening the cover to ensure safety and prolong the life of your pool equipment.
Why does water accumulate on pool covers?
Water accumulates on pool covers primarily from rain, snowmelt, or overspray from nearby sprinklers. Solid safety covers, which are commonly used during the off-season, are designed to protect the pool from debris but can collect water if not properly tensioned or equipped with a drainage system. If the cover isn’t sloped or fitted tightly over the pool, water has nowhere to drain and pools on the surface.
Improper installation or neglecting to use a cover pump can also contribute to water buildup. In regions with frequent rainfall or melting snow, it’s especially important to regularly check and remove any collected water. Keeping the cover clean and free of debris will also help prevent water from settling and creating problem areas that may compromise the integrity of the cover and the water quality underneath.
What tools are needed to safely remove water from a pool cover?
To safely remove water from a pool cover, you’ll typically need a submersible cover pump, a garden hose or extension cord (depending on the pump), and possibly a leaf blower or siphon tube for smaller amounts of water. The cover pump is the most effective tool for removing large volumes of water without manually lifting or disturbing the cover too much. These pumps can be left on the cover for several hours or even overnight to fully drain standing water.
In addition to basic tools, wearing slip-resistant footwear and gloves adds an extra layer of safety. It’s also useful to have a skimmer net on hand to remove floating debris after the water is drained. For automated systems, some pool owners install automatic pump systems that can detect and remove water before it becomes an issue. Keeping these tools on hand and maintaining them ensures you’re always prepared to manage water on your pool cover.
Is it safe to leave water on a mesh pool cover?
Water can be left on a mesh pool cover for short periods because the material allows some drainage through its pores. However, excessive water collection can still lead to problems such as sagging, uneven weight distribution, and difficulty in securing the cover properly. Over time, the accumulated water may also trap debris and cause staining on the pool surface.
Even though mesh covers are designed to allow water to pass through, leaves, dirt, and algae can clog the pores over time, effectively making the cover behave like a solid one. That’s why it’s best to periodically check your mesh cover and ensure water isn’t pooling excessively. A cover pump is still recommended to remove any large accumulations and help maintain optimal cover performance throughout the season.
What are the risks of opening a pool cover with water on top?
Opening a pool cover with water on top poses several risks, including physical injury from slipping on the slick surface and the potential to tear or damage the cover due to its heavy weight. The strain of lifting a soaked cover can also cause harm to muscles or joints, particularly if the cover is large or improperly positioned. Additionally, water running into the pool during removal can bring contaminants from the cover into the water, increasing the workload for pool cleaning.
Beyond physical risks, allowing water to remain on the cover for long periods can harbor bacteria and pests, such as mosquitoes, especially during warmer seasons. It may also weaken the seams and attachment points of the cover, decreasing its effectiveness over time. Taking the extra steps to remove water ensures a smoother opening process and helps preserve your pool’s cleanliness and condition.
How can I prevent water from accumulating on my pool cover?
Preventing water accumulation on a pool cover starts with proper installation. The cover should be tight and sloped slightly to allow water to runoff toward a drainage point or cover pump. For solid covers, some pool owners install a dome or bubble shield beneath the cover to encourage water flow toward the center, where a pump can easily remove it. Using a cover specifically designed for your pool shape also reduces the likelihood of sagging.
Regular maintenance is essential—this includes routinely checking for debris that can obstruct water drainage and inspecting your cover pump to ensure it’s functioning properly. In areas with frequent rain, some pool owners install an automatic pump that activates when water reaches a certain level. Keeping trees trimmed around the pool area also helps reduce leaf and debris buildup, which can clog the cover and prevent proper drainage.
Can opening a wet pool cover damage my pool?
Yes, opening a wet pool cover can indirectly damage your pool by allowing contaminants like dirt, leaves, and insects to fall into the water, increasing the cleaning time and chemical demand. Moreover, when the cover is heavy with water, it can pull at anchor points or winch systems, possibly loosening them over time and compromising the safety of the cover setup. This can lead to structural stress on both the cover and the installation hardware.
Additionally, when removing a soaked cover, there’s a risk of water flowing into the skimmer or surrounding deck area, potentially causing water damage to nearby structures or surfaces. If the cover has been left wet for an extended period, mold and mildew may have already started to develop, which can affect water chemistry and even staining on the pool walls. Proper water removal and maintenance of the cover help prevent these potential issues from occurring.