Can you put a bottom drain in an above ground pool?

Quick Answer

Yes, it is possible to install a bottom drain in an above ground pool. The process involves cutting a hole in the bottom of the pool liner, installing plumbing to connect the drain, and patching the liner. Proper installation is key to prevent leaks. Hiring a professional is recommended, as improperly installing a bottom drain can lead to liner failure.

What is a Bottom Drain?

A bottom drain is a type of drain installed in the lowest point of a swimming pool’s floor. It connects to the pool’s pump and filtration system to allow water to be pulled from the bottom of the pool for circulation and cleaning.

Bottom drains serve several purposes:

• Improves circulation – Pulls water from the bottom of the pool which tends to be cooler and have more debris/dirt that settles.
• Prevents damage from suction – Using a bottom drain reduces the need for skimmer suction which can damage pool liners over time.
• Provides backup – If skimmers get blocked by debris, the bottom drain ensures water keeps flowing to the pump.
• Enhances safety – Properly sized and covered bottom drains minimize the risk of body or hair entrapment accidents.

Challenges of Adding a Bottom Drain to Above Ground Pools

While bottom drains provide benefits, installing them in above ground pools presents some unique challenges:

• Liner compatibility – Above ground pools use vinyl liners which must be cut to install a bottom drain. Improper cuts can lead to leaks and liner failure.
• Plumbing access – Getting access underneath the pool to install drainage pipes can be difficult in above ground pools.
• Weight concerns – The pool walls are not designed to support a lot of additional weight from plumbing and concrete. This must be accounted for.
• Freezing climates – In areas where winter freeze occurs, the bottom drain must be properly winterized to prevent ice damage.

Proper planning and installation techniques can overcome these challenges in most situations. Hiring an experienced pool professional is highly recommended.

Should You Add a Bottom Drain?

Adding a bottom drain to your above ground pool can make sense in certain situations:

• If you need improved circulation – A bottom drain ensures the entire volume of water cycles through the pump and filter for better skimming and heating.
• When upgrading the pump system – If installing a more powerful pump, a bottom drain helps ensure the pump doesn’t suck air from the skimmers.
• For frequent swimmers – The improved circulation can keep pool water cleaner for pools that get heavy usage.
• In windy areas – Bottom drains reduce reliance on skimmers which often get blocked by windblown debris.

A bottom drain may not be justified in some cases:

• On very small above ground pools – Short pool lengths make adequate circulation easier to achieve with skimmers alone.
• With mesh safety covers – Covers prevent debris from sinking and reduce need for bottom drain backups.
• For temporary seasonal pools – The effort and expense may not be warranted if only used short-term.
• With simple pump systems – Basic single-speed pumps often don’t require bottom drain support.

Assessing your specific pool conditions is important before deciding on adding a bottom drain. An experienced pool pro can evaluate and make recommendations.

How to Install a Bottom Drain in an Above Ground Pool

If you do decide to add a bottom drain to an above ground pool, the following provides an overview of the installation process:

1. Choose an appropriate bottom drain cover – Select an approved antivortex cover suitable for the pump system flow rate.
2. Determine the drain placement – Mark the liner for a drain towards a corner or end for easiest plumbing access.
3. Cut hole in liner – Use a razor knife with heavy duty blades designed for pool liner cutting.
4. Install drain housing – Position the bottom drain body and tighten flange hardware.
5. Attach plumbing – Glue pipes into the drain housing outlet. Run pipe as needed under pool.
6. Connect pump system – Plumb pipes to connect the bottom drain to suction side of the pump.
7. Seal and test – Patch liner hole with vinyl patch glue. Fill pool and check for leaks.
8. Backfill plumbing – Bury and stabilize all under pool piping through proper backfilling methods.

Cutting the precise hole size and methodically gluing pipe joints is critical to prevent liner leaks. Allow patch glue time to fully cure before filling pool.

Special Considerations

Some additional factors to keep in mind when adding a bottom drain:

• Hire a professional installer if possible – This complex job requires expertise to avoid problems.
• Account for freeze protection – In cold climates the drain will need proper winterization.
• Get needed permits – Building permits are usually required for this type of pool plumbing work.
• Update electrical bonding – Proper bonding to pool reinforcing bars may require updating.
• Limit weight over pipes – Don’t construct heavy decks or pave over under pool plumbing runs.

With careful installation, a bottom drain can be a worthwhile enhancement to an above ground pool. But improper workmanship can also lead to frustration, leaks and liner damage if not done right.

Cost to Install Bottom Drain in Above Ground Pool

The costs to add a bottom drain to an existing above ground pool typically range from $800 to $2,500. The price varies based on:

• Drain material – Simple plastic drains cost less than bronze or stainless steel.
• Pipe routing – Short direct runs are cheaper than long complex plumbing.
• Excavation needs – Hand digging under the pool adds cost versus open ground access.
• Permit fees – Costs range from $50 to $500+ depending on the area.
• Professional vs DIY – Hiring an experienced contractor costs more but recommended.

Here is a sample breakdown of typical costs:

Bottom drain installation costs	Basic range
Drain kit and fittings	$200 – $800
Plumbing pipe and excavation	$300 – $800
Liner patch	$100 – $250
Permits	$50 – $500
Professional installation fees	$500 – $1,500
Total installed cost	$800 – $2,500+

Getting quotes from several pool companies is suggested. Beware very low bids that seem too good to be true.

DIY Installation Tips

For pool owners comfortable tackling do-it-yourself projects, installing a bottom drain is possible as a DIY job. Here are some tips:

• Shop online for drain kits with all fittings included. Quality EZ-Drain kits start around $300.
• Allow plenty of time over a few days. This is a slow, methodical process.
• Rent or borrow tools like a mini-excavator for digging plumbing trenches.
• Have an assistant to help position cumbersome pipes in excavated trenches.
• Watch online videos to understand the key steps before starting.
• Take photos after each installation stage to record the configuration.
• Perform a very slow test fill & check for leaks before finishing.

While DIY installation can save on labor costs, it requires advanced skills. Attempting this as a first-time project risks expensive liner damage. Consult with pool professionals if unsure about tackling this solo.

Hiring a Pool Company

Due to the complexity involved, hiring a professional pool contractor is highly recommended when adding a bottom drain to an existing above ground pool. Here are some tips when choosing an installer:

• Ask about experience – Choose a company that has done many bottom drain installations before.
• Request references – Reputable firms will gladly provide names and numbers of past clients.
• Look for proper licensing – Contractors should carry current licenses and insurance.
• Get detailed bids – Bids should spell out specific parts, materials and scope of work.
• Inquire about warranties – Good companies will back up their bottom drain work if issues arise.
• Check pool builder forums – Research companies online and read reviews from others in your area.
• Go with established firms – Look for many years in business as a sign of stability.

Rushing into a cheap quick job by an inexperienced contractor can end badly. Investing a bit more upfront with the right pro pays off in the long run.

Conclusion

Installing a bottom drain in an existing above ground pool is definitely possible but also comes with challenges. For improved circulation and cleaner water, adding this upgrade can be worth the effort and expense. Make sure to carefully plan the project and hire competent professionals. With good design and workmanship, a bottom drain can be a nice enhancement to maximize enjoyment of your above ground pool.