How to Winterize a Stock Tank Pool (Step by Step)

Why You Need to Winterize Your Stock Tank Pool

As temperatures drop and pool season winds down, it's time to think about protecting your stock tank pool investment. Winterizing isn't just about draining the water — it's a critical maintenance step that prevents rust, freeze damage, cracked fittings, and stubborn algae stains that can ruin your setup before the next warm season even arrives.

Whether you built your own DIY setup or installed a complete stock tank pool kit from Stock Tank Pool Products, proper winterization takes less than an afternoon and can save you hundreds of dollars in replacement parts and repairs. Let's walk through the process step by step.

Step 1: Balance the Water Chemistry One Last Time

Before you drain your stock tank pool, give it one final chemical treatment. This helps prevent algae and bacterial growth from taking hold while you work through the remaining steps. Add a small dose of chlorine or shock and let the pump circulate for at least 30 minutes. This kills off any organisms that could leave staining or biofilm on the tank walls during draining.

Step 2: Drain the Water Completely

Once treated, it's time to empty the pool. If your setup includes a drain fitting — like the ones included in STPP's stock tank pool kits — simply attach a garden hose to the drain and direct the water to a suitable area of your yard, away from your home's foundation. If you don't have a drain, you can use a submersible pump or a siphon method with a garden hose.

Pro tip: Avoid draining chlorinated water directly into flower beds or vegetable gardens. Direct it to a grassy area or let the chlorine dissipate for 24-48 hours before draining near sensitive plants.

Step 3: Remove and Store Your Equipment

Once the tank is empty, carefully disconnect all your pool equipment:

• Pump and filter: Disconnect your pump, drain any remaining water from the housing, and remove the filter cartridge. Store the pump indoors in a dry, temperature-controlled space.
• Hoses and fittings: Remove any external hoses and drain them completely. Coiled hoses with trapped water can crack when frozen.
• Skimmer basket: Remove, clean, and store your skimmer basket indoors.
• Lighting or accessories: Remove any underwater LED lights, floating accessories, or decorative elements.

Storing your equipment indoors is the single most important thing you can do to extend its lifespan. Freezing temperatures are the number one killer of pool pumps and PVC fittings.

Step 4: Clean the Inside of the Tank

With the water drained and equipment removed, give the inside of your stock tank a thorough scrub. Use a non-abrasive brush or sponge with a mixture of baking soda and water to remove any algae, mineral deposits, or waterline stains. Avoid harsh chemical cleaners or steel wool, which can damage the galvanized coating that protects your tank from rust.

Rinse the tank thoroughly with a garden hose and let it dry completely before moving to the next step.

Step 5: Inspect for Rust and Treat Problem Areas

Now is the perfect time to inspect your stock tank pool for early signs of rust or corrosion. Pay close attention to:

• The waterline area where moisture and air meet
• Around drain fittings and bulkhead connections
• The bottom of the tank, especially if it sits directly on concrete or pavers
• Any scratches or chips in the galvanized surface

If you spot minor surface rust, gently sand it with fine-grit sandpaper (220 grit) and apply a rust-inhibiting primer formulated for galvanized metal. For the interior, a coat of rubberized pool paint or sealant can add an extra layer of protection over the off-season.

Step 6: Elevate and Protect the Bottom

If your stock tank pool sits directly on the ground, moisture can become trapped underneath and accelerate rusting on the bottom — the area you can't easily inspect. Consider placing the empty tank on a few pressure-treated lumber pieces, pavers, or a simple platform to allow airflow underneath.

If you're planning next year's setup, Stock Tank Pool Products offers accessories and guidance for proper pool placement that protects the bottom of your tank year-round.

Step 7: Cover Your Stock Tank Pool

A good cover is your tank's best friend during winter. It keeps out rain, snow, debris, and critters that might decide your pool is a cozy winter home. Here are a few effective cover options:

• Heavy-duty tarp: An affordable and effective option. Choose a tarp slightly larger than your tank and secure it with bungee cords or rope around the outside.
• Fitted pool cover: If you can find one sized for your tank (common sizes are 8-foot round or 8x2 oval), a fitted cover offers the best protection against pooling water and wind.
• Plywood topper: A piece of treated plywood cut to size and weighted down works well for keeping everything out and is easy to remove in spring.

Whichever method you choose, make sure the cover is secure enough to handle wind and heavy snow loads in your area.

Step 8: Perform a Quick Spring Checklist

Winterization isn't complete without a plan for spring startup. Tape this quick checklist to your stored pump or save it on your phone:

• Inspect the tank for any new rust spots
• Reinstall drain fittings and check gaskets for cracks
• Reconnect the pump and test for leaks before filling
• Fill the tank and balance the water chemistry before your first swim
• Replace the filter cartridge if it's more than one season old

Should You Drain It or Leave Water In?

This is the most common winterization debate among stock tank pool owners. In mild climates where temperatures rarely dip below freezing, you can keep water in the tank with a winter algaecide and a cover. However, in regions that experience hard freezes, draining is strongly recommended. Expanding ice can warp the tank walls, crack fittings, and destroy your pump if water is left inside the lines.

When in doubt, drain it out.

Protect Your Investment for Years to Come

A well-maintained stock tank pool can last five years or more with proper seasonal care. Winterization is a small effort that pays off every spring when you can fill up and enjoy your backyard oasis without costly repairs or a full replacement.

If you're building your first stock tank pool or upgrading your current setup, check out the complete DIY stock tank pool kits at Stock Tank Pool Products. Every kit includes high-quality fittings, a filtration system, and detailed instructions that make both setup and seasonal maintenance a breeze. Here's to many summers of backyard pool fun!