How to Remove Metal Stains from Your Pool
Introduction
Have you noticed brown, green, or blue patches on your pool floor or walls that just won’t brush away? You could be dealing with metal stains. These unsightly marks are often confused with algae or dirt, but they require a different approach to remove.
In this guide, we’ll help you identify metal staining, remove it safely, and prevent it from returning using Deep Blue’s expert-tested stain solutions.
What Causes Metal Stains in Pools?
Stains are usually caused by iron, copper, or manganese in your pool water. Common sources include:
- Fill water from a well or corroded pipes
- Low-quality algaecides containing copper
- Old heater cores and pool fixtures
- Metal accessories or tools left in the pool
How to Identify Metal Stains
| Metal | Stain Colour |
|---|---|
| Iron | Brown, rust-red |
| Copper | Green, turquoise, or black |
| Manganese | Purple or dark brown/black |
Stains are usually flat, don’t brush away, and appear in specific areas like steps, drains, or areas with low circulation.
Step-by-Step: How to Remove Metal Stains
1. Test for Metals
Use a metal test kit to confirm the presence and type of metal in your pool water.
2. Balance the Water
pH should be slightly low (around 7.0–7.2) to aid stain removal.
3. Use a Stain Remover
- Apply Deep Blue Stain Remover to the affected area
- Brush lightly and circulate for 24–48 hours
4. Add a Metal Sequestrant
This binds metals in the water and prevents them from re-depositing. Use Deep Blue Metal Control after treatment.
5. Clean Your Filter
Metals will be captured by the filter. Rinse or backwash after 48 hours of circulation.
Preventing Metal Stains in the Future
1. Pre-Treat Fill Water
Use a metal filter or hose pre-filter when topping up the pool, especially if using well water.
2. Maintain Water Balance
- Keep pH and TA in the ideal range
- Use metal-friendly algaecides
3. Regular Sequestrant Dosing
Use Deep Blue Metal Control monthly in areas with high mineral content or older plumbing.
4. Avoid Leaving Metal Objects in the Pool
Remove ladders, thermometers, and tools when not in use.
Eco-Safe Stain Removal
Deep Blue’s stain solutions are:
- Phosphate-free
- Compatible with chlorine and salt systems
- Safe for all pool surfaces
Need Help Diagnosing a Stain?
- Contact our expert support team with photos
- Visit our Stain ID Chart for common patterns
Loyalty Rewards for Stain Control
- Earn points on stain removers and preventers
- Get discounts on filter cleaners and water balancers
Conclusion
Metal stains are stubborn — but not permanent. With Deep Blue’s targeted, surface-safe stain removers and metal control products, you can restore your pool’s beauty and keep stains away for good.
FAQs
Do metal stains come back?
They can, if the metal source isn’t removed or controlled with a sequestrant.
Can I swim during treatment?
Wait 24–48 hours after stain remover is applied. Sequestrants are swim-safe once dissolved.
Will chlorine cause staining?
Chlorine doesn’t cause stains but can oxidise metals already in the water, making them visible.
Can I use vitamin C tablets for stains?
Ascorbic acid can lighten stains temporarily, but it’s not a long-term solution. Use a professional product for best results.
Is stain remover safe for vinyl liners?
Yes — Deep Blue products are safe for vinyl, fibreglass, and concrete surfaces.
