In fact, this is an extremely fine algae carried on tiny grains of sand carried by the winds of the Sahara.

The micro-organism attaches itself to sand dust transported by the wind, rains, and storms, and develops on contact with water; if you do not act quickly, it can invade your swimming pool. This mustard algae is very resistant, and can only be eliminated with a special treatment that combines a powerful anti-algae and a shock chlorination treatment.

• If necessary, adjust the pH to between 7.0 and 7.4 with hth®  pH MINUS MICRO-BALLS to lower the level and hth®  pH PLUS POWDER to increase it.
• Then use the product hth®  YELLOW SHOCK. This treatment has been specially designed to combat the most resistant algae, including mustard algae.
• Within one hour, perform a shock chlorination procedure using hth®  SHOCK POWDER.
• Let the filtration run for 24 hours.
• If algae remains at the bottom of the pool, perform a static flocculation (with the filtration stopped) using hth®  RAPIDFLOC leaving it to act between 12 and 24 hours.
• Then use a vacuum broom to remove any deposits that have accumulated at the bottom of the pool and tip the dirt into the sewer.

We strongly advise cleaning any object that may have been in contact with mustard algae such as inflatable mattresses, toys, and other pool floaters.

The broom vacuum cleaner or robot which was used to aspire the particles must also be cleaned. The mustard algae will return if these small precautions are not taken.

Mustard algae are tenacious and proliferate very easily, so you may have to repeat this treatment.

   Did you know?

The appearance of mustard algues is rarely an isolated case and occurs across a geographical zone. If your swimming pool is contaminated, your neighbour's pool is as well, and vice versa.