Algae build-up in hot tubs is a common issue that many owners face, and it can be frustrating to deal with. Algae thrive in warm, moist environments, making your hot tub a perfect breeding ground if the conditions aren’t properly controlled. While algae growth may seem to happen overnight, several factors contribute to its rapid formation. Understanding these causes is key to preventing and treating algae effectively. Let’s explore some of the most common reasons why algae might build up quickly in your hot tub and what you can do about it.