Green Hot Tub Water: How to Clean and Prevent It

Seeing green water in your hot tub can be alarming, but the good news is it’s often a fixable issue. Whether caused by algae, metal content, or improper water chemistry, addressing green water involves a few simple steps to restore your spa to its clean and clear state.

What Causes Green Water in Hot Tubs?

There are several potential reasons your hot tub water may appear green. Here are the most common causes:

• Algae Growth: Algae thrive in warm, untreated water. If sanitizer levels like chlorine or bromine are too low, algae can grow quickly, turning your water green.
• High Metal Content: Metals like copper and iron can oxidize in water, causing a green tint. This often happens if your water source contains high metal levels.
• Imbalanced Water Chemistry: Improper pH and alkalinity levels can lead to conditions that encourage discoloration.

How to Fix Green Hot Tub Water

To restore your hot tub to its clear, inviting condition, follow these steps:

1. Test the Water: Use a test strip or water test kit to check pH, alkalinity, and sanitizer levels. Note any imbalances or unusual readings.
2. Shock the Water: Add a spa shock treatment to break down organic contaminants and eliminate algae. Follow the product’s instructions for the correct dosage.
3. Check and Adjust Water Chemistry: Balance pH and alkalinity levels using appropriate spa chemicals. pH should be between 7.2 and 7.8, and alkalinity should range from 80 to 120 ppm.
4. Address Metal Content: If metals are causing the discoloration, add a metal sequestrant to bind the metals and prevent oxidation. You may also consider using a pre-filter when refilling your spa to reduce metal content in the water.
5. Clean the Filters: Remove and clean your hot tub filters to ensure they are free of debris and working efficiently.
6. Run the Circulation System: Turn on the hot tub’s pump to circulate the water and distribute chemicals evenly.

Preventing Green Water in the Future

Regular maintenance is the key to avoiding green water. Here are some tips to keep your hot tub water clean and clear:

• Maintain Sanitizer Levels: Always keep chlorine or bromine levels within the recommended range to prevent algae growth.
• Test and Balance Water Weekly: Check pH, alkalinity, and sanitizer levels regularly to ensure balanced water chemistry.
• Use a Cover: Cover your hot tub when not in use to keep out debris and sunlight, which can encourage algae growth.
• Shock After Heavy Use: If your hot tub gets a lot of use, shock the water afterward to remove organic contaminants.

Final Thoughts

While green hot tub water can be frustrating, it’s often a manageable problem with proper care and maintenance. By understanding the causes and implementing regular maintenance practices, you can enjoy crystal-clear water year-round. Need the right products to maintain your hot tub? Explore our Hot Tub Care Collection for everything you need to keep your spa in top condition.