Yellow algae in swimming pool

What causes yellow algae in pool?

Yellow algae (also known as mustard algae) is commonly mistaken for dirt or sand at the bottom of the pool. This form of algae normally grows in shady areas of the pool, and killing it requires an extra chemical such as Yellow Out®, in addition to chlorine. … Shock your pool water weekly. Keep your water balanced.

How do I get rid of yellow algae in my pool?

How to Get Rid of Mustard Algae

  1. Remove all items from the pool, except cleaning equipment, which you will disinfect when you shock the pool. …
  2. Brush the algae and then let it settle. …
  3. Balance your pH and alkalinity. …
  4. Shock your pool with chlorine — twice the amount you would use for a typical shock treatment.

Can you swim in a pool with mustard algae?

Mustard algae is rare and often mistaken for sand, dirt, or a stain in your pool. It’s not slimy like regular green algae, but it likes to attach itself to pool walls and other items. It’s also chlorine-resistant and very stubborn. It can even live outside of your swimming pool.

Is it OK to swim in a pool with yellow algae?

While mustard algae is not harmful to humans, an overgrowth can attract harmful bacteria like e. coli. What’s more, they can cloud the water and stain the swimming pool. Unlike green algae which float on water, mustard algae cling onto the bottom and the walls of the pool.

Will chlorine kill yellow algae?

After treatment for yellow algae it’s common that the pool water is cloudy or at least hazy. Adjust pH to 7.4, brush the pool daily and vacuum to waste once or twice after treatment to remove dead yellow algae. … Yellow algae can be a nightmare, but a lot of chlorine will kill it – dead.

You might be interested:  Swimming pool calcium hardness

Why does yellow algae keep coming back?


A chlorine wash of the pool is a popular treatment for rough pools with green and yellow recurrent algae blooms. A chlorine wash is just like an acid wash, except that one pours bleach over the walls and floor (of an empty pool), scrubbing and rinsing thoroughly.

How do you use yellow cure algaecide?

  1. Directions.
  2. STEP 1: For swimming pools, add 5 ounces (one level capful) of Yellow Treat® per 10,000 gallons by broadcasting directly onto pool water surface. …
  3. STEP 2: Brush pool or spa.
  4. STEP 3: Independant of chlorine level, immediately add liquid or dry chlorinating product for super-chlorination.

Why does my pool have a yellow tint?

In pool water, chlorine ions immediately mix with water molecules to form colorless hypochlorous acid. If you see a yellow color in the water, it’s usually caused by minerals–primarily iron. Iron is a common contaminant in wells and municipal water systems, and while it may be troublesome, it isn’t a health hazard.

What is yellow out for the pool?

Yellow Out is a chemical breakthrough that, when used in conjunction with pool shock, eradicates yellow/mustard, green, brown, and pink algae from swimming pools. … Yellow Out is also safe, non-toxic and can be used on all pool surfaces, including vinyl liners.

Does pool shock kill algae?

Large amounts of algae may require you to add up to three doses of shock over a 36-hour period. When using large amounts of shock to kill algae, water may become cloudy. This should not be a problem, and the water should clear up after running the filter. Wait until the chlorine ppm has fallen below 5.0.

You might be interested:  Swimming pool vacuum hoses

What is the best algaecide for mustard algae?

While liquid and granular chlorine have been proven to be effective sanitizers, using an algaecide that is designed to treat yellow algae specifically is the smartest way to get rid of the problem quickly. When the active ingredient in Stop Yellow, sodium bromide, combines with chlorine it creates hypobromous acid.

Leave a Reply

Your email address will not be published. Required fields are marked *