Are you considering installing inground pool plumbing but unsure where to start? Don't worry, it may seem intimidating, but with a clear plan and careful execution, it's actually quite straightforward. Whether you choose to do it yourself or hire a professional, understanding the basics of inground pool plumbing is essential to ensure a leak-free and efficient system. In this article, we will discuss the definition, location, and timeline of inground pool plumbing, as well as provide useful tips and FAQs to guide you through the installation process.

What is Inground Pool Plumbing?

Inground pool plumbing refers to the buried pipes below the ground that connect the pool to the filtration equipment. It includes the suction lines, skimmer, and main drain line, which connect to the pool pump through a three-way valve. The return line is the pipe that carries water from the pool filter back to the wall returns. Other plumbing pipes can be connected to features such as steps, a pool cleaner line, fountains, and water features. Inground pool plumbing is typically done after the pool walls have been constructed, about halfway through the process.

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Materials for Inground Pool Plumbing

Before starting the installation, measure the distance from your equipment pad to the skimmer, main drain, return, and any other plumbing pipes. Your suction pipes (skimmer, main drain) usually come to one side of the equipment pad, and the return pipes come out on the other side of the pad, into the ground. You'll need to purchase the appropriate length of flexible PVC pipe, PVC fittings, and valves based on these measurements.

In The Swim Pool Packages

To simplify your inground pool plumbing installation, consider purchasing a pool package from a reputable supplier like In The Swim. Their packages include everything you need to install inground pool plumbing. However, if your pad is far from the pool or if you want to add a cleaner or fountain line, you may need additional pipes, PVC fittings, and valves.

Differences Between Schedule 20, Schedule 40, and Schedule 80

The numbers refer to the thickness of the pipe wall. Schedule 20 pipe has a wall thickness of 0.100", Schedule 40 has a wall thickness of 0.150", and Schedule 80 pipe is a gray PVC pipe with a wall thickness of 0.200". Schedule 80 fittings can be used on pumps and filters if you encounter any issues with Schedule 40 fittings melting, shrinking, or leaking. Schedule 20 pipe should not be used for pool plumbing or pressure lines. Schedule 40 is the standard choice.

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Commonly Used PVC Fittings

To connect various sections of pipe, you'll need different PVC fittings. Here are six commonly used PVC fittings for inground pool plumbing:

• Coupling: Used to connect two sections of pipe.
• 90-degree elbow: Turns the pipe 90 degrees.
• 45-degree elbow: Turns the pipe 45 degrees.
• MTA (Male Threaded Adapter): Male threaded to slip fitting.
• FTA (Female Threaded Adapter): Female threaded to slip fitting.
• Tee: 3-way fitting with one inlet and two outlets.

Installing Pool Light Conduit Plumbing

For the conduit used to carry electrical wires to the pool lights, you'll need 3/4" gray conduit, which can be purchased in 10-foot lengths. The conduit should run from the pool junction box to the pool light niche, which is mounted on the pool wall. The junction box can be located at the equipment pad if it is close to the pool light or mounted closer to the pool light to accommodate the 50-foot pool light cord. The junction box should not be located within 10 feet of the pool and should be 18" above the water level in the pool.

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Covering the Trenches

It's a good practice to cover the trenches after testing the pool pump and filter to ensure there are no leaks. Place the liner and fill up the pool. Then, install the deck and let the pipes fill with water. Let the system run for a day, and if no wet spots are found on dry ground, you are ready to backfill the soil around the pool, including the trenches in the pipe trenches. Fill and tamp the soil carefully, making sure not to put pressure on underground pipes and fittings. Wet the soil around the pipes to ensure the ground beneath the pipes moves to provide support.

Tips for Making a Glue Joint

To ensure a secure and leak-free connection, follow these tips for making a glue joint:

1. Make straight cuts across the pipe.
2. Remove rough edges or burrs from the pipe.
3. Apply primer to the pipe and fitting before sliding them together.
4. Apply a generous amount of PVC cement to the pipe and fitting.
5. Use only deep socket pressure fittings (Schedule 40).
6. Press the pipe together and hold it for 20 seconds after gluing.

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Additional FAQs

Q: Can I use black poly pipe for pool plumbing?

A: Yes, black polyethylene pipe can be used for pool plumbing. However, it requires different fittings and installation methods than PVC pipe. It is generally less reliable and more prone to leaks, so some builders prefer not to use it. If you choose to use black poly pipe, try to minimize the number of underground connectors to reduce the possibility of leaks.

Q: How deep should inground pool pipes be buried?

A: Inground pool pipes should be buried approximately 2 feet underground to protect them from surface ground movement and freezing temperatures. If your pool is in a southern region with rare freezing temperatures, you may bury the pipes slightly less deep, but deeper is always better if feasible. Remember to call your local Dig Safe service to mark your utility lines before any excavation work in your backyard.

Q: Should I use flexible or rigid PVC pipe for inground pool plumbing?

A: Flexible PVC pipe is easier to work with, as it lays flat in the trenches and bends without the need for restrictive fittings. It also packs better in the ground and is less likely to break under compaction. However, rigid PVC pipe is more resistant to chemical degradation and offers greater resistance to problems caused by soil shifts.

Q: Should I use 1.5" or 2" PVC pipe for inground pool plumbing?

A: If you are upgrading to a variable speed pump with 2" ports or planning to add large water features or powerful spa jets, it is recommended to use 2" PVC pipe for better flow and cost savings. However, for standard applications, 1.5" PVC pipe is sufficient.

By following these guidelines and understanding the basics of inground pool plumbing, you'll be well-equipped to tackle your own installation or communicate effectively with professionals. Remember, proper planning, careful measurements, and attention to detail are key to a successful inground pool plumbing project. If you have any further questions or encounter any challenges, don't hesitate to reach out to pool plumbing experts for assistance. Happy swimming!

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