How do I Remove Stains Caused by Leaves in my Pool?

Brush the stained areas and use a stain remover designed for organic material. Balance the water to prevent further staining.

Why Leaf Stains Happen

Stains from leaves are mostly caused by:

• Prolonged leaf contact on pool surfaces

• Organic compounds such as tannins

• Acidic reactions between decaying leaves and water chemistry

• Lack of circulation or filtration in certain areas

Stains tend to develop faster in the fall or in pools surrounded by trees. They’re especially noticeable on light-colored surfaces.

How to Identify a Leaf Stain vs. Other Stains

Before treating, be sure the stain is from organic material and not metals or minerals.

• Leaf stains: Usually brown, green, or yellow and irregular in shape

• Metal stains: Blue-green (copper), brownish-red (iron)

• Algae: Feels slimy, can be brushed off, returns quickly

To test: place a chlorine tablet on the stained area for a few minutes. If it lightens, it's likely organic.

Step-by-Step: How to Remove Leaf Stains

Step 1: Remove All Leaves and Debris

• Skim the surface and vacuum the pool floor

• Empty the skimmer and pump baskets

• Use a leaf net for large debris

Get the source of the problem out first so it doesn’t continue causing stains.

Step 2: Brush the Affected Areas

• Use a nylon or vinyl-safe brush

• Scrub stains directly with moderate pressure

• Focus on corners, steps, and deep ends where leaves collect

Brushing loosens the stain and preps the surface for chemical treatment.

Step 3: Shock the Pool

• Use a chlorine shock or non-chlorine oxidizer

• Run the pump for 8 to 12 hours after shocking

• Retest water 24 hours later to adjust pH or alkalinity if needed

Shocking helps oxidize organic compounds and fade stains over time.

Step 4: Use a Stain Remover if Needed

For tougher or older stains:

• Use an enzyme-based stain remover for organic buildup

• Apply directly to the stain or spot-treat with a stain eraser

• Follow label instructions carefully

Some products require bypassing the filter temporarily or brushing after application.

Step 5: Balance Water Chemistry

• Maintain pH between 7.4 and 7.6

• Keep chlorine between 1 and 3 ppm

• Check alkalinity and calcium levels weekly

Balanced water helps prevent stains from settling in and becoming permanent.

How to Prevent Leaf Stains in the Future

1. Use a pool cover when the pool is not in use

2. Skim and vacuum regularly during leaf-heavy seasons

3. Trim trees or install leaf barriers around the pool

4. Run the pump longer during fall to keep water circulating

5. Clean skimmer baskets daily when leaves are falling

6. Shock the pool weekly if it’s exposed to high organic load

7. Use a clarifier or enzyme cleaner weekly to break down organic matter

Consistency is key. A few minutes each day can save hours of scrubbing later.

When to Call a Pro

If stains won’t budge or your pool has multiple discoloration issues:

• Contact a pool technician for stain identification

• They may perform an acid wash or recommend targeted chemical treatments

This is especially useful for older pools or surfaces with long-term staining.

With a little patience and the right approach, leaf stains can be removed and prevented. Keeping leaves out and your water balanced makes for a cleaner, healthier pool that’s always ready for use.