

Spa algae develop from insufficient chlorine levels, out of balance water chemistry or bad filtration. Algae also occur due to items being introduced into the water from natural bodies of water. At the onset of algae, it's important to take action to prevent a full-scale algae bloom.
It's also important to note you can swim with a mild case of algae although it's not recommended, as high levels of algae can contain harmful bacteria and pathogens such as E-coli. In general, always avoid swimming in a spa that hasn't been correctly sanitized and cleaned.
There are three types of spa algae. It's important to determine which type of algae you have in your water in order to efficiently remove it.
The most common spa algae are green and it's also the easiest to kill. Green algae grow quickly and produce the telltale cloudy water and green slime on surfaces. Removing green algae requires cleaning your spa, filtering your water and then conducting a spa shock treatment.
Yellow spa algae tend to develop in humid climates. It presents as brown or mustard coloured algae in the shady areas of your spa. Yellow algae is chlorine-resistant, so killing it will require multiple cleaning passes for your spa and a more intense spa shock treatment for your spa water.
The worst of the algae types is black algae, which is actually a bacteria. It is extremely hard to kill requiring multiple cleaning attempts. And if you don't clean your spa completely thoroughly it will tend to grow back quickly.
On occasions, a spa will become infected with algae. This is more common with tank water. If this occurs, the removal process is to thoroughly clean the spa, balance the water chemistry and filter the water. Below are more details on this process.
Adhering to a consistent spa maintenance regime will help avoid algae issues.
Following these basic principles will help prevent future algae issues. And deal with algae if it should occur. Remember the key is to act fast at the first sight of algae to prevent a full-scale algae bloom.
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