How to Drain and Clean a Pool [Step by Step Guide]

Draining and cleaning your swimming pool is more than just part of seasonal care. It is a process that, when done correctly, protects your pool’s structure, maintains chemical balance, and ensures a safe swimming environment.

In this step by step guide, you will learn how to drain and clean a pool properly, when and why to do it, how to avoid structural damage, and how to dispose of water responsibly.

Before You Start Draining

Before emptying pool water, it is vital to check local regulations. Some councils have strict rules on how and where pool water can be discharged. Failing to comply can lead to environmental damage and significant fines. Pool water should ideally be directed into a sanitary sewer system, not a storm drain, to avoid harming local ecosystems.

Ensure the water is dechlorinated and has a neutral pH level before disposal. This prevents chlorine from damaging vegetation or aquatic life. Consulting a professional is also recommended if you are draining a large or inground pool to handle risks and ensure compliance with regulations.

Why Draining a Pool Requires Careful Planning

Draining a swimming pool is not something to do without preparation. It involves risks to both the pool structure and the surrounding area. Never leave a draining pool unattended. A partially or fully empty pool can experience hydrostatic pressure that may cause it to lift, crack, or shift. This is especially true in fibreglass and concrete pools.

Draining a pool completely is generally not recommended unless absolutely necessary. Always assess whether a partial drain will achieve your goal. Common reasons to drain include persistent algae growth, high cyanuric acid levels, chemical imbalance, or preparing for an acid wash or structural repairs.

Tools Required to Drain a Pool Safely

To drain your pool safely and efficiently, gather the following equipment:

• Submersible pump or pool pump
• Discharge hose
• Garden hose
• Skimmer net
• Pool brush
• Pool vacuum
• Test kits for pH, chlorine and alkalinity
• Protective gloves and eyewear
• Logbook to track tasks
• Bucket for remaining water
• Algaecide and cleaning agents

A submersible pump is the most efficient method for draining. It removes water faster than siphoning with a hose and helps prevent standing water or flooding around the pool.

How to Drain a Pool Step by Step

Step 1: Plan the Drainage

Check the weather forecast and avoid draining during rainy periods. Identify the correct drainage system and ensure the discharge hose is securely placed to prevent flooding or erosion.

Step 2: Start Draining

Connect the submersible pump and discharge hose. Place the pump at the deepest part of the pool to start draining. Monitor the process to ensure continuous flow and avoid system overload. Never let the pump run dry.

If using a pool pump with a waste or backwash setting, route the water to an approved drainage area. This method is slower and may not be ideal for full drainage.

Step 3: Monitor Progress and Stay Present

Never walk away from a draining pool. Watch the water level closely to avoid damaging the filtration system or exposing the pool floor too quickly. Draining a pool too quickly can result in structural damage, especially in concrete or fibreglass pools.

How to Clean a Pool After Draining

Step 4: Remove Debris

Use a skimmer net to remove surface debris and a pool vacuum to collect dirt and other debris that has settled on the floor. Regularly skimming the surface and vacuuming helps prevent safety hazards and damage to equipment.

Step 5: Brush Walls and Floor

Use a stiff pool brush to scrub the pool walls, floor and waterline tiles. This helps prevent algae buildup and removes stains. Brushing should be part of weekly maintenance to prevent long term damage and to keep your swimming pool surfaces clean.

Step 6: Acid Wash if Needed

For deep cleaning, especially in older or stained concrete pools, an acid wash may be required. This process strips a thin layer from the surface and removes embedded algae and discolouration. Acid washing should only be carried out with proper protection or by a professional.

Step 7: Inspect for Damage

Before refilling, inspect the shell for cracks, chips or any signs of deterioration. Make necessary repairs while the pool is empty. Look at the condition of the tiles, coping, floor and joints.

Also inspect your pool pump, pump baskets, and filter system to ensure everything is functioning properly.

Refilling and Rebalancing Your Pool Water

Step 8: Refill with Clean Water

Refill the pool using a garden hose. This process can take several hours depending on water pressure and pool size. Monitor the water level and stop filling just below the skimmer.

Step 9: Test and Adjust Water Chemistry

Use professional-grade test strips to check chlorine levels, pH level, alkalinity and cyanuric acid. Maintaining balanced water chemistry is essential to keep the pool safe for swimmers and prevent equipment corrosion.

If required, add chlorine, algaecide, or other chemicals based on volume and system type. Document all additions and measurements in a logbook for easy future reference.

Best Practice Pool Maintenance Tips

Proper pool maintenance keeps your water safe, clear and ready for swimming all year round.

• Test the water at least twice a week during summer
• Run the pool filter 8 to 10 hours daily in warmer months
• Clean filter cartridges or backwash sand filters regularly
• Vacuum the pool weekly to remove dirt from the floor
• Brush the walls and floor weekly to prevent algae and stains
• Use algaecide to treat visible algae if brushing alone is not enough
• Use a skimmer net daily to remove leaves, insects and other debris
• Check skimmer and pump baskets to prevent clogging
• Drain excess water if it rises after heavy rain
• Use a pool cover during autumn to reduce debris
• Run the filter 4 to 6 hours daily in winter to maintain clarity
• Use a winterising kit in the off-season to prevent algae growth
• Keep track of maintenance dates in a pool logbook
• Properly cleaning pool filters prolongs their lifespan and enhances performance

Common Mistakes to Avoid

• Draining without checking local laws
• Failing to dechlorinate pool water before disposal
• Leaving the pool empty for days
• Draining too fast without considering hydrostatic pressure
• Ignoring visible cracks before refilling
• Using improper chemical doses during rebalancing
• Neglecting to run the filter system after refill

Final Word: Clean Water, Long Life Pool

Draining and cleaning your swimming pool is a task that requires precision, care and timing. Done properly, it protects your investment and ensures your pool remains clean, functional and beautiful.

If you are unsure about how to drain and clean a pool or need help with balancing chemicals, diagnosing structural issues or disposing of pool water responsibly, reach out to the team at 1 Pool Care. We offer professional support, equipment servicing and tailored advice for every pool owner in Perth.

Contact us today for trusted service and clean water peace of mind.