How to Drain a Pool: A Complete Pool Draining Tutorial

Draining a pool is an essential task for various reasons, including maintenance, repairs, and winterization. Whether you’re dealing with an inground or above-ground pool, knowing how to properly drain it will help you protect your investment and ensure your pool’s longevity. In this guide, we’ll cover several methods for draining a pool, including using a submersible pump, the pool’s built-in pump, and even a hose. We’ll also discuss how to drain a pool with a sand filter and without a pump, providing you with a comprehensive resource for all your pool-draining questions.

Are Main Drains and Skimmers Required for Inground Pools?

Necessary Tools and Materials

To drain your pool efficiently, you’ll need to gather the appropriate tools and materials based on the method you choose. Below is a table listing the tools required for each draining method.

• Submersible Pump: Ideal for most pool types, requires a submersible pump and a long discharge hose.

• Pool Pump: Uses the pool’s existing pump system, effective but requires proper setup.

• Hose (Siphon Method): A simple, cost-effective option that works well for smaller pools.

• Sand Filter: Utilizes the pool’s sand filter system, suitable for post-rain drainage.

Preparation for Pool Draining

Before you begin draining your pool, follow these essential preparatory steps to ensure a smooth and safe process:

1. Turn off the pool pump: Make sure the pool’s pump and filtration system are completely turned off.

2. Check local regulations: Verify if there are any local rules regarding pool water disposal to avoid fines or environmental damage.

3. Plan for water disposal: Decide where the drained water will go—ideally to a sanitary sewer or a well-drained area away from structures.

4. Test the water: Before draining, check the water's chemical balance to avoid harming the environment when it’s released.

5. Protect pool surfaces: If you’re draining an inground pool, take steps to prevent cracking by avoiding draining on extremely hot or cold days.

Steps To Drain a Pool Using a Submersible Pump

1. Place the submersible pump in the pool: Position the pump at the deepest part of the pool, typically the deep end. Ensure the pump sits flat on the pool floor to maximize water extraction. Some models may come with a small stand or base to keep the pump steady.

2. Attach the discharge hose: Connect a long discharge hose to the pump’s outlet. Ensure the hose is long enough to reach your designated drainage area, such as a storm drain or a safe area away from your home and neighboring properties. Secure the connection tightly to prevent leaks.

3. Check power connections: Before plugging in the pump, inspect the power cord and connections for any signs of wear or damage. If using an extension cord, ensure it is rated for outdoor use and can handle the pump's power requirements. Position the cord to avoid any contact with water.

4. Begin pumping: Turn on the pump and observe the flow of water through the discharge hose. It’s crucial to monitor the hose’s end to ensure that water is draining correctly and not pooling or flooding unwanted areas. This process can take several hours depending on the pool’s size and pump capacity.

5. Monitor the process: Regularly check both the water level in the pool and the pump to ensure everything is functioning properly. If the pump begins to suck air (which can happen when the water level gets very low), turn it off immediately to avoid damaging the pump.

6. Shut off the pump: Once the water level is as low as the pump can manage (typically a few inches from the bottom), turn off the pump. Disconnect the hose and remove the pump from the pool. You may need to remove the last bit of water manually, using a wet/dry vacuum or by hand.

How To Drain a Pool Using the Pool Pump

1. Switch the pool pump to waste setting: Begin by locating your pool’s multiport valve, (usually found on the filter). Turn the valve to the “Waste” or “Backwash” setting. This setting bypasses the filter and sends water directly out of the pool, which is essential for efficient draining.

2. Attach the backwash hose: Connect a backwash hose to the waste port of the filter system. Ensure the hose is securely attached and is long enough to reach your chosen drainage area. Position the end of the hose to avoid flooding or erosion in your yard or to direct water into an appropriate drainage system.

3. Turn on the pump: With the hose in place and the valve set correctly, switch on the pool pump. Water should begin flowing out of the pool immediately. It’s crucial to stay close by and monitor the pump and water flow, as leaving the pump unattended could lead to potential damage.

4. Monitor the water level: Keep a close eye on the pool’s water level as it drains. The process can be slower than using a submersible pump, especially in large pools, but this method is convenient since it uses the existing pool equipment. Stop the process when the water level gets too low for the pump to continue operating efficiently.

5. Turn off the pump: Once the pool is mostly drained (leaving a few inches of water), turn off the pump to prevent it from running dry, which could damage the pump’s motor. At this point, you can switch the multiport valve back to its normal filter position and disconnect the backwash hose.

Why Do I Need Two Main Drains for My Swimming Pool?

How To Drain a Pool with a Hose

1. Submerge the hose: Start by laying out the garden hose and making sure it's long enough to reach from your pool to the drainage area. Submerge the entire hose in the pool, ensuring it’s fully filled with water. You can use the weight of the water to help remove any air bubbles trapped inside, which is crucial for establishing a strong siphon.

2. Create a siphon: Once the hose is filled, cover one end tightly with your hand to prevent water from escaping. Quickly move this end of the hose to the designated drainage area, ensuring it's lower than the pool’s water level to allow gravity to work in your favor. The water should start flowing out of the hose on its own.

3. Monitor the flow: Keep an eye on the process to ensure that the water continues to flow smoothly and that the hose remains securely in place. This method is simple but can be slow, particularly for larger pools, so patience is key. Adjust the submerged end of the hose to control the water level if you only need to drain part of the pool.

4. Complete the drainage: Once the pool is drained to your desired level, you may need to scoop out any remaining water manually with buckets or a wet/dry vacuum, especially if the hose cannot remove the last few inches. Afterward, clean the pool to prepare it for the next use or for repairs.

How To Drain a Pool With a Sand Filter or Without a Pump

• Using a Sand Filter: To drain a pool using a sand filter, first, set the multiport valve to the “Waste” position. This bypasses the filter media and allows water to flow directly out of the pool. Turn on the pool pump, and the water will start draining out through the backwash hose connected to the filter. This method is particularly useful for removing excess water after heavy rain or when you need to lower the pool’s water level quickly. Monitor the water level closely and turn off the pump before it starts sucking in air to avoid damage.

• Without a Pump: If you don’t have access to a pump, you can use the siphon method with a garden hose, as described above. This approach relies entirely on gravity, making it slower but effective for smaller volumes of water or when other equipment is not available. Alternatively, for very small pools or limited drainage needs, manually removing water with buckets can be an option, though it's labor-intensive.

Both methods are practical in different scenarios, with the sand filter method being more efficient for quick drainage and the siphon method serving as a reliable, no-power-needed alternative.

Best Way To Drain a Pool

How To Drain a Pool - Frequently Asked Questions

• How much does it cost to drain a pool?

  The cost to drain a pool can vary significantly based on the pool’s size, location, and the method used. For a basic drain and refill, costs typically range from $70 to $150. However, if professional services are required, such as draining, cleaning, and refilling, prices can escalate to between $300 and $800 or more.

• Can I drain my inground pool entirely?

  Draining an inground pool entirely is generally not recommended due to the risks involved. The biggest concern is hydrostatic pressure, which can cause the pool to “float” or crack if the groundwater level is high. This is particularly risky for fiberglass pools, where improper draining can lead to bulging walls and structural damage. Always consult a professional before considering a full drain.

• How often should I drain my pool?

  It’s typically recommended to drain and refill your pool every 3 to 5 years. However, this can depend on factors such as usage frequency, environmental conditions, and the ability to maintain proper chemical balance. If your pool water becomes difficult to balance chemically, or if algae growth becomes persistent despite regular maintenance, it might be time to consider a partial or full drain.

• What are the risks of draining a pool too quickly?

  Draining a pool too quickly can lead to significant structural damage. The rapid removal of water can cause the pool walls to collapse or the floor to crack, especially in concrete or fiberglass pools. The sudden reduction in water pressure can also allow groundwater to push against the pool from the outside, causing it to lift or “pop” out of the ground. It’s crucial to drain the pool slowly. Consult a professional to minimize these risks.

• How do I dispose of pool water responsibly?

  Pool water should be disposed of in a way that minimizes environmental impact. Ideally, you should direct the water into a sanitary sewer system rather than a storm drain, as pool water may contain chemicals that can harm local ecosystems. It’s important to ensure the water is properly dechlorinated and has a neutral pH before disposal. Always check with your local municipality’s regulations.

• Is it necessary to hire a professional to drain a large pool?

  While it is possible to drain a pool on your own, hiring a professional is often advisable, especially for large or inground pools. Professionals have the expertise to handle the risks associated with draining, such as hydrostatic pressure and structural damage. They can also ensure that the process is done safely and in compliance with local regulations.