Draining an inground pool is a task that many pool owners may need to undertake at some point, whether for seasonal maintenance, repairs, or deep cleaning. While the idea might seem overwhelming, especially for first-timers, the process has become much more straightforward thanks to modern equipment and techniques. The key to success lies in understanding your pool type, choosing the right tools, and following a clear step-by-step process.
This guide will walk you through the easiest and safest way to drain your inground pool, minimizing risks to your pool structure and the environment. We’ll explore the most common methods, tools you might need, and essential tips to ensure your draining process goes smoothly.
Why You Might Need to Drain Your Inground Pool
Before jumping into the process, it’s important to understand why you might need to empty your inground pool in the first place. Knowing these scenarios helps you determine whether a full drain is necessary or a partial clean might suffice.
Common Reasons for Draining:
- Seasonal maintenance or winterization
- Renovation or resurfacing (e.g., plastering, tiling)
- High Total Dissolved Solids (TDS) and other chemical imbalances
- Repair needs such as fixing cracks, leaks, or pool flooring issues
- Contamination from heavy debris, algae bloom, or water discoloration
While modern filtration systems allow for ongoing water recycling, certain repairs or maintenance activities make draining inevitable. Understanding your reason for draining will help you choose the right tools and techniques.
The Easiest Way to Drain an Inground Pool
The most effective and user-friendly method to drain an inground pool involves using a submersible pump or pool cover pump, along with the right accessories and setup. While traditional methods such as connecting to a garden hose or using municipal sewer systems exist, they are time-consuming, risky, and often unnecessary.
Step 1: Prepare Your Pool and Surrounding Area
Before you start draining, take the following preparatory steps:
- Turn off power to pool equipment at the circuit breaker to ensure safety.
- Set up a clear path for water discharge to avoid flooding nearby structures or lawns.
- Ensure the pool is not connected to municipal sewer systems unless permitted locally.
- Check for any equipment or accessories, like pool lights and vacuum heads, that need removal before pumping begins.
Proper preparation prevents accidents and keeps the draining process efficient.
Step 2: Decide on the Drainage Location
Before you start the pump, it’s crucial to know where the water will go. Discharging pool water improperly can cause foundation damage or legal issues, depending on your local water discharge laws.
Avoid draining water onto:
- Streets or storm drains (often illegal due to contamination risks)
- Septic tanks (chlorinated pool water harms septic systems)
Instead, opt for safe discharge areas like:
- Downslope areas of your yard that won’t flood or erode
- City-approved irrigation areas (if applicable)
If you are unsure, contact your local city office to understand what kind of water drainage is permitted for swimming pools.
Step 3: Set Up Your Pumping System
There are several pumping options available depending on your needs and budget. The most effective for inground pools are:
- Submersible Pool Pump – Powerful and fast, designed to pump large volumes of water from the pool floor.
- Dirty Water Transfer Pump – Ideal if the water is filled with debris such as leaves and algae.
- Utility Pump – Smaller, less powerful, but suitable for light draining tasks.
Follow these setup steps:
Choose the right pump: Ensure it’s powerful enough to handle several thousand gallons of water (at least 40-60 gallons per minute is preferred).
Place the pump in the deep end: This helps remove a maximum amount of water and leaves minimal standing depth.
Attach a water hose: Connect one end of a garden hose to the pump and the other to your designated drainage zone.
Use two hoses (if necessary): If draining across the yard, consider using a siphon from one section to another to control water flow without damaging your lawn.
Step 4: Start Pumping
Once the pump is in place and the discharge line is clear:
- Plug the pump into a grounded outlet. Avoid using extension cords unless they’re heavy-duty and outdoor-rated.
- Check for proper water flow: Ensure water is discharging where intended. Adjust the hose angle or placement if needed.
- Monitor water levels: Don’t leave the pump unattended for long periods, especially as the water level lowers. Ensure the pump isn’t sucking in air, which can damage the unit.
Pumping time varies depending on the pool size:
| Pool Volume | Average Drain Time (40 GPM pump) |
|---|---|
| 15,000 gallons | Approx. 6–7 hours |
| 20,000 gallons | Approx. 8–9 hours |
| 30,000 gallons | Approx. 12–14 hours |
The process typically takes from half a workday to a full day, depending on equipment efficiency and how much water needs to be drained (partial or full).
Step 5: Stop and Evaluate
Depending on your original goal, you might not need to remove all the water. For tasks like resurfacing or minor repair, you may want to stop once the water is 12–18 inches below the skimmer. Keeping a small amount of water in the pool helps prevent hydrostatic pressure damage, particularly in concrete pools.
If full drainage is required, especially in regions with a high water table, professionals recommend the use of hydrostatic relief valves or professional dewatering systems to prevent lifting or structural damage.
Alternative Pool Draining Methods
While using a pool pump remains the easiest and most reliable method, some alternatives may be considered depending on your situation.
Using Your Filter System’s Waste Line
Most sand filter pools have a waste valve that can be used to drain water.
- Set the filter to the “waste” setting.
- Place the waste line directly in a safe drainage area.
- Turn on the pump to remove the water.
However, this method has risks:
- Cannot fully empty a deep pool — usually leaves several inches of water
- High potential to damage the pump if water level drops too low
- Time-consuming compared to using a dedicated pump
Gravity Draining with a Hose and Siphon
A DIY approach is using one or more garden hoses to siphon water. While this method doesn’t require power or expensive tools, it’s relatively slow and labor-intensive.
How to Siphon Your Pool Manually:
- Place one end of a garden hose at the deepest point of the pool on the floor.
- Submerge it to ensure water flows. Then place the other end in a drain or safe area.
- Start the siphon by sucking on one end or using a siphon pump.
- Maintain a steady flow by adjusting the height difference between the pool and the discharge area.
While this option works in emergencies, expect it to take days to fully drain a medium-to-large-sized inground pool.
Pro Tips for Draining Your Pool Safely and Efficiently
1. Avoid Draining During Rainy or Wet Weather
Draining a pool when surrounding soil is already saturated can increase chances of ground shifting, which could lead to structural damage. If your area recently experienced heavy rainfall, wait a few days before proceeding.
2. Check Local Regulations Before Draining
Pool water is often full of chemicals, especially chlorine and algaecides, that can harm local waterways and groundwater if not handled correctly. Some cities require:
- pH balancing before draining
- non-chlorinated discharge points
Make sure you understand your city’s stormwater discharge ordinance to avoid penalties or environmental damage.
3. Keep Some Water in Concrete and Vinyl Pools
Draining any inground pool for an extended period is risky due to hydrostatic pressure from the ground pushing up — particularly a concern for concrete, fiberglass, and vinyl pools.
For concrete pools: Never completely empty unless under professional supervision.
For vinyl pools: Complete emptying without proper backfill can cause the vinyl liner to shrink, rip, or come loose.
If you’re draining for repairs, consult with a pool contractor to ensure the best approach based on your pool’s structural integrity and groundwater situation.
4. Drain Water from the Surface First (if it has debris)
Using your filter system first or skimming debris before pumping ensures the process is faster and more efficient. Clean water doesn’t clog pumps as quickly and allows for faster drainage.
5. Disconnect Automated Pool Cleaners and Remove Accessories
Ensure all automatic pool cleaners, pool lights, ladder bases, and diving board brackets are removed before draining to prevent damage.
Special Considerations Based on Pool Type
Not all pools drain the same way, and different types require special care and precautions.
Concrete (Gunite) Pools
Concrete pools are the most durable but can suffer from hydrostatic pressure and lifting if drained during high groundwater levels.
Key Tips:
- Always consult with a pool professional before draining completely
- Use hydrostatic relief valves when appropriate
- Resurface requires full draining only after all water table conditions are checked
Vinyl Liner Pools
Vinyl pools are sensitive and prone to damage if the water level drops too much or too suddenly. The flexible nature of vinyl means it can shift or tear without adequate water support.
Key Tips:
- Emptying a vinyl pool must be followed by immediate repairs and re-filling to avoid shrinkage
- Do not allow the pool to sit empty for more than 1–2 weeks without monitoring
- In very hot weather, cover the exposed liner with a tarp to prevent it from drying out
Fiberglass Pools
Fiberglass pools require special attention due to their lightweight and flexible structure.
Key Tips:
- Only drain partially unless advised by a contractor for major repairs
- Consider adding support beams to prevent bowing or cracking if completely emptying
- Never leave the pool empty in high water table conditions
When to Hire Professionals
While draining your pool can typically be a DIY-friendly task, especially if you’re just dropping levels for surface cleaning or minor fixes, there are times when calling a professional pool contractor is the best option.
Scenarios that Require Expert Assistance:
- You live in an area with a high water table or poor drainage
- You’re completely draining the pool for long-term repairs (plaster change, plumbing, crack sealing)
- There are local laws or permits required for water discharge
- The pool’s water has heavy contamination (e.g., chemicals, fuel, pesticides)
Professionals not only bring proper equipment but also have knowledge about safe procedures and local regulations, which helps prevent legal issues or damage to your pool.
Conclusion: Safely and Efficiently Drain Your Inground Pool
Draining an inground pool doesn’t have to be an overwhelming chore with the correct tools and information. By using the easiest method — a submersible pump — pool owners can efficiently and safely remove water from their pool in a matter of hours to a day, depending on the size and depth.
However, always remember to:
- Follow local water discharge laws
- Assess the type of pool and its drainage needs
- Monitor weather and groundwater levels
If you’re unsure due to complex conditions or local ordinances, don’t hesitate to reach out to a licensed pool technician or contractor. Their expertise can prevent costly mistakes and ensure your inground pool remains in excellent condition for years to come.
Now that you’re equipped with the fastest, safest, and most reliable way to drain an inground pool, it’s time to take action when the need arises — safely and confidently.
Can I drain my inground pool using a garden hose?
Yes, you can drain an inground pool using a garden hose, although it may not be the fastest method. This process involves using a submersible pump to push the water through the hose. Most standard garden hoses can be connected directly to a pump outlet, which is then placed in the pool. As the pump operates, it pushes water out through the hose to a designated drainage area, such as a storm drain or a safe distance from your home’s foundation.
However, it’s important to consider the time it will take to fully drain the pool using this method. The length and diameter of the hose, along with the pump’s strength, will influence the overall efficiency. Additionally, local regulations may restrict where you can discharge pool water due to chemical content. Always check with local authorities before draining to ensure that your method complies with environmental guidelines and avoids damage to landscaping or plumbing systems.
How long does it take to drain an inground pool with a submersible pump?
The time required to drain an inground pool using a submersible pump depends on several factors, including the pool’s size and the pump’s flow rate, typically measured in gallons per hour (GPH). For example, a standard residential pool holding around 20,000 gallons will take several hours to drain completely if the pump has a flow rate of 6,000 GPH. Larger pools or smaller pumps can extend this time significantly, sometimes up to a full day or more, especially if the pump must be emptied and reset multiple times.
To speed up the process, use a high-capacity pump designed for larger water volumes and ensure the discharge hose is positioned correctly for maximum flow efficiency. Keep in mind that the pump must remain submerged in water to function properly, so you’ll need to monitor water levels throughout the process. Once the water level drops low enough, you may need to reposition the pump or use a wet/dry vacuum for the remaining water at the bottom of the pool.
Is it safe to use a pool pump to drain the pool?
It is generally not recommended to use a standard pool pump to drain the pool. Pool pumps are designed to circulate water, not to remove it in large volumes. Using the pool pump to drain water can cause damage to the system, especially if the water level drops below the skimmer, which can allow air into the system and lead to dry running. This can overheat the pump motor and ruin the seals, resulting in costly repairs or replacements.
Instead, it’s best to use a submersible pump specifically designed for removing large quantities of water. These pumps can safely handle the full draining process without risking damage to your pool’s plumbing or filtration system. Always ensure the pump is placed on a stable, flat surface inside the pool to prevent it from tipping over, and monitor the process to avoid overloading circuits or causing water damage in unintended areas.
What should I do with the water after draining the pool?
After draining your inground pool, it’s crucial to handle the water properly to avoid environmental harm and potential legal issues. Pool water often contains chlorine, salt, or other chemicals that can damage plants, soil, and local water systems. Before draining, test the water to determine its chemical levels and allow chlorine levels to dissipate if necessary. Ideally, you should discharge the water into a municipal storm drain system or sewer line, avoiding direct release into nearby gardens or waterways.
If your local regulations allow, you can use environmentally friendly dechlorination products to neutralize harmful chemicals before disposal. For saltwater pools, extra precautions are needed, as saltwater can be especially damaging to freshwater plants and soil. In some cases, local wastewater treatment facilities may offer guidelines or assistance in disposing of large volumes of treated water safely, ensuring compliance with local standards.
How do I prepare my inground pool for draining?
Before draining your inground pool, it’s important to follow the proper preparation steps to avoid damaging the structure or equipment. Begin by turning off all electrical equipment connected to the pool, including the main pump and heater, to prevent accidents or equipment failure. You should also adjust chemical levels in the water if necessary, particularly for saltwater or heavily chlorinated pools, to ensure safe handling during the drainage process.
Next, gather all the necessary equipment, such as a submersible pump, appropriately sized hoses, and a power source that can handle the pump’s wattage. Ensure the discharge area is free of obstructions and that water will flow away from the pool area without affecting nearby structures or landscaping. If draining for maintenance or repair, consider removing any skimmers, return jets, or lights that might be affected by the lower water levels, and check with a professional if there are concerns about hydrostatic pressure or structural integrity.
Do I need to lower the water level completely?
Whether you need to lower the water level completely depends on the reason for draining your pool. If you’re performing routine maintenance, such as resurfacing the tile line or vacuuming debris, only partially draining the pool may be sufficient. In these cases, using a submersible pump or a manual bucket method for small adjustments is ideal. However, if you’re winterizing the pool or conducting major repairs, such as replacing a vinyl liner or fixing structural cracks, it may be necessary to drain the pool completely.
Be cautious when fully draining a pool, as hydrostatic pressure from the ground beneath the pool can cause it to lift or crack in rare cases. This is especially true for concrete or fiberglass pools. Always consult a professional before emptying your pool entirely. If you’re draining for an extended period, some experts recommend leaving a small amount of water in the pool to counterbalance this pressure, especially in areas with high water tables or during rainy seasons.
Can I reuse the water from my inground pool after draining?
Reusing the water from an inground pool after draining is possible, but it requires proper treatment and depends largely on the type of pool you have. For chlorine-treated pools, the water should be dechlorinated before use. This can be done using chemical neutralizers or by allowing the chlorine to dissipate naturally by letting the water sit for several days under sunlight. However, even after dechlorination, the water may still contain other chemicals, such as algaecides or clarifiers, which could affect soil or plants.
Saltwater pools present a more complex challenge, as the sodium content can be harmful to plants and may degrade soil quality. If you’re considering reusing saltwater for cleaning or irrigation, it’s best to invest in a desalination system or consult with a professional to ensure proper water treatment. In some regions, reusing pool water is encouraged through rainwater harvesting systems or greywater recycling programs, provided it meets local safety and environmental standards. Always consider the intended use and test the water quality before reusing it for any purpose.