Pool owners often face a tricky question: what to do with thousands of litres of water when it’s time to drain or backwash the pool. Instead of wasting it, many wonder — can pool water be recycled or reused?
The good news is yes — with the right approach, you can give your pool water a second life. In this guide, we’ll explain when and how pool water can be recycled, reused around your home, and why it matters for sustainability and your water bill.
Why You Might Need to Drain Pool Water
Partial or full pool drainage is sometimes required for:
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Removing high levels of stabiliser or calcium
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Replacing contaminated or cloudy water
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Switching sanitation systems (e.g. chlorine to salt)
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Pool repairs or resurfacing
You might also waste water through filter backwashing, overflow, or splash-out.
Instead of sending it straight to the stormwater system, consider reuse options.
Can Pool Water Be Reused Directly?
✅ Yes, but only under certain conditions.
Pool water contains:
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Chlorine or salt
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Stabilisers
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pH adjusters
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Algaecides and other treatments
These chemicals make it unsuitable for direct reuse in most garden or greywater systems — unless treated first.
Safe Ways to Reuse Pool Water
1. Watering Lawns (with care)
Let chlorine dissipate for at least 48–72 hours (or until free chlorine is 0 ppm) before using it on grass.
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Test the water with strips first
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Avoid watering on hot days (increases evaporation and root stress)
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Don’t overwater — salt or chlorine buildup can damage roots
2. Watering Gardens or Trees
Avoid using untreated pool water on:
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Delicate flowering plants
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Edible vegetables or herbs
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potted plants (salt builds up fast)
Instead, reuse for:
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Large trees or hardy shrubs
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Flower beds (after dechlorination)
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Border plants
Add gypsum to the soil afterwards to help neutralise salt and improve drainage.
3. Filter Backwash Reuse
Backwash water is high in debris, dirt, and chemicals — not great for reuse directly.
However:
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Some eco-pools install settling tanks or filter drums to remove solids
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Water can then be used on lawns or non-sensitive areas
Note: This may not be legal in all areas. Always check your local council regulations.
Can You Recycle Pool Water for Refill?
Yes — with specialised filtration.
Some pool owners use reverse osmosis filtration systems to:
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Remove calcium, TDS (total dissolved solids), and chemicals
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Restore clean, usable water for refilling the same pool
This is commonly used in:
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Drought-affected areas
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Pools with recurring chemical imbalances
Reverse osmosis units are expensive upfront but can save thousands of litres long-term.
Council and Legal Considerations
Before recycling or draining:
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Check with your local council — some areas have restrictions on how/where you can dispose of or reuse pool water
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Never discharge into stormwater drains — this can pollute natural waterways
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Use sewer clean-outs or grassy areas where permitted
How to Dechlorinate Pool Water Before Reuse
| Method | Timeframe | Notes |
|---|---|---|
| Let it sit | 48–72 hours | Chlorine breaks down naturally in sun |
| Add dechlorinator | Instant | Use a neutralising agent available at pool shops |
| Use activated carbon | Fast | Often used in tanks or filters |
You can find dechlorination kits in our pool products section.
When Not to Reuse Pool Water
Avoid reusing water if:
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Chlorine is still active (above 1 ppm)
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Algaecide or phosphate treatments were recently added
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Water is cloudy, green, or has floating debris
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You’re dealing with biohazards or contamination
In these cases, it’s safer to dispose of the water legally and refill.
Benefits of Recycling Pool Water
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Save money on tap water or irrigation
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Reduce strain on local stormwater systems
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Lower your environmental impact
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Extend life of your pool water between full drains
Conclusion
So, can pool water be recycled? Yes — but only after proper treatment or chemical dissipation.
You can reuse dechlorinated water for:
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Lawns
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Trees
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Garden beds
Or invest in filtration systems to recycle water back into the pool. Always check your local council rules before discharging or reusing.
Want help choosing filtration tools or safe water testing kits? Browse our pool products or visit us in-store.
FAQ
Yes, if chlorine levels are below 1 ppm. Let the water sit for 48–72 hours in the sun or use a dechlorinator before applying it to your lawn.
No. Even low levels of chlorine or salt can harm edible plants and soil microbes. Avoid using pool water on herbs, vegetables, or fruit trees.
In most areas, no. You should never drain chlorinated water into stormwater drains. Always check with your local council for disposal regulations.
Let it sit for 2–3 days in the sun, or use a commercial dechlorination product. Activated carbon filters can also remove chlorine quickly.
Reverse osmosis is a high-grade filtration system that removes calcium, salts, and contaminants from pool water — allowing it to be reused safely in the same pool.
Generally no, unless you have a settling tank or filtration system to remove debris and chemicals. Backwash water is high in contaminants.
Yes. Salt can accumulate in soil and damage plant roots. Avoid using saltwater on gardens unless diluted and only on hardy shrubs or trees.
Direct it to a grassy area or use a sewer access point, if allowed by your local council. Never discharge it to the stormwater drain.
Yes — using reverse osmosis or similar filtration systems. It’s an effective way to remove contaminants without draining and wasting water.
Visit our [pool products](https://www.pumpandpoolpeople.com.au/) section for water neutralisers, test strips, and tools to help you safely reuse pool water.