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Why is My Spa Foaming?

If you've noticed foam forming on the surface of your spa or hot tub, you're not alone. This common issue can be both unsightly and indicative of water quality problems. But what causes spa foam, and how can you prevent it? In this SEO-friendly guide, we'll explore the reasons behind hot tub foaming and offer practical solutions to keep your water crystal clear.

What Causes Spa or Hot Tub Foam?

Foaming in hot tubs occurs due to the accumulation of Total Dissolved Solids (TDS) in the water. These solids rise to the surface when air is introduced through the spa's jets or air blower. The foam you see is essentially these dissolved solids clinging to air bubbles as they ascend.

Sources of Total Dissolved Solids (TDS)

TDS levels can increase from a variety of sources, including:

  • Perspiration and dead skin cells
  • Residue from soap, deodorant, and bathing suits
  • Skin lotions, creams, and hair sprays
  • Chemicals added for water treatment

While some of these particles are filtered out, many dissolve in the water, contributing to the TDS levels.

The Consequences of High TDS Levels

When TDS levels reach a saturation point, foam is the first sign of trouble. If left unchecked, the water will eventually become permanently cloudy, reaching its true saturation point. At this stage, no amount of filtering or chemical treatment will restore water clarity.

How to Prevent and Treat Spa Foam

Short-Term Solution

A Water Defoamer can temporarily reduce foam, but it's not a long-term solution.

Long-Term Solution

The best preventative measure is to be as clean as possible before entering the hot tub. This will help extend the time between necessary water changes, ideally to about 8 weeks.


Foaming in your spa or hot tub is a sign of high TDS levels, often caused by a combination of human contaminants and chemical treatments. While Water Defoamers offer a temporary fix, the most effective long-term solution is regular water replacement and entering the spa as clean as possible. Keep an eye on your water quality to enjoy a foam-free, relaxing spa experience.

By understanding the causes and solutions for spa foaming, you can take proactive steps to maintain a clean and enjoyable hot tub. Keep your spa foam-free and extend the time between water changes by following these guidelines.

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