How to keep hot tub water naturally clean

Posted by Laura Onder de Linden

4 August 2026

On 1 December 2023

Clean, clear water is one of the most important parts of enjoying a hot tub. When the water looks fresh and inviting, your soaks become far more enjoyable. The good news is that modern water treatment systems can help maintain perfect water quality without relying heavily on harsher chemical treatments.

Why water quality matters

A hot tub is a warm environment, which means water quality requires ongoing attention. Pollen, body oils, and other organic matter naturally find their way into the water over time. A good filtration system is the foundation of clean water. By continuously circulating and filtering the water, it removes particles before they can affect clarity and water quality.

A different approach to water treatment

Traditionally, many hot tubs relied heavily on bromine or chlorine to maintain water quality. While these products are still commonly used in some systems, modern spa systems offer additional ways to keep water clean.

At Northern Lights Hot Tubs, our spa system can be equipped with ozone purification and mineral ionisation. These technologies work alongside the filtration system to help maintain water quality and reduce the need for chemicals like bromine.

Ozone naturally helps break down organic contaminants in the water, while mineral ionisation helps control bacteria and algae growth. Together, they support cleaner, fresher water without needing multiple products. That is why these technologies are also used for water treatment in e.g. breweries, public pools and even in manned space crafts. In fact, they offer the best possible water treatment possible.

Cleaner water with less effort

Modern filtration, ozone purification, and mineral ionisation make it easier than ever to maintain clean and inviting water throughout the year. Instead of relying heavily on harsher sanitising products, these systems help create a more balanced approach to water care.

The result is simple: fresh water, less maintenance, more time to enjoy your cedar hot tub, and a water treatment method that works in harmony with the natural properties of the beautiful cedar .

Learn more about our ozone purification and mineral ionisation systems and discover how they can help maintain excellent water quality in your hot tub.