How to Remove Stains from Your Pool Liner or Walls: A Step-by-Step Guide
Pool stains can be frustrating for any pool owner, especially when they make your otherwise clear and inviting pool look dirty or neglected. At M&S Swimming Pools, we’ve helped countless pool owners in Suffolk County, Long Island restore their pool liners and walls to pristine condition. In this guide, we’ll break down why pool stains happen, how to remove them, and how to prevent them in the future.
What Causes Stains on Pool Liners and Walls?
Before tackling stains, it's important to understand their cause. Stains can be categorized into two main types:
Metal Stains – Caused by metals like iron, copper, and manganese in the water. These often appear brown, green, or reddish.
Organic Stains – Caused by leaves, algae, or other natural debris. These stains are usually green, yellow, or brown.
Other common causes include:
High levels of minerals in the water
Improperly balanced chemicals
Algae buildup
Sunscreen, oils, and lotions
How to Identify the Type of Stain in Your Pool
To determine if your stain is organic or metallic, try this quick test:
✔ Vitamin C test (for metal stains): Take a vitamin C tablet, rub it on the stain, and see if it lightens. If so, it's likely a metal stain.
✔ Chlorine test (for organic stains): Apply a small amount of liquid chlorine to the stain. If it fades, it’s probably an organic stain.
How to Remove Stains from Your Pool Liner or Walls
1. Removing Metal Stains
🔹 Use a Metal Stain Remover – A commercial stain remover specifically for pools can help lift metal stains.
🔹 Ascorbic Acid Treatment (Vitamin C) – If the stain is mild, applying ascorbic acid (Vitamin C powder) directly to the area can help.
🔹 Sequestering Agents – These products bind to metals and prevent them from staining. Regular use helps keep metal stains away.
🔹 Adjust Pool pH and Alkalinity – Keeping your pH levels between 7.2 - 7.6 and alkalinity between 80-120 ppm can prevent metal stains.
2. Removing Organic Stains
🔹 Shock the Pool – Add a high dose of chlorine to break down organic matter.
🔹 Scrub with a Pool Brush – Use a brush suitable for your liner type (soft brush for vinyl, stiff for concrete).
🔹 Enzyme Cleaners – These are great for breaking down oils, sunscreen, and organic debris.
🔹 Algaecide Treatment – If stains are due to algae, an algaecide treatment can help remove stubborn stains.
Preventing Pool Stains in the Future
Keep Your Water Balanced – Regularly check pH, chlorine, and alkalinity levels.
Use a Pool Cover – This prevents leaves and debris from causing stains.
Clean Regularly – Weekly vacuuming and brushing help prevent buildup.
Use Metal Sequestering Agents – If your water source has high iron or copper, these will prevent stains.
Maintain Proper Filtration – A clean filter prevents debris and minerals from settling.
Need Help Removing Stains? Call M&S Swimming Pools!
At M&S Swimming Pools, we specialize in professional pool cleaning, liner replacements, and maintenance in Suffolk County, Long Island. If you’re dealing with stubborn stains or need expert pool care, we’re here to help!
📞 Call us today at 631-281-8300
📧 Email us at mike@msswimmingpoolsli.com
