Yellow Algae

You can learn to get rid of and control of these swimming pool problems by using pool tips to have the best pool water quality.

Proper pool water maintenance and using the best pool tips are essential in fighting any kind of swimming pool algae.

Yellow & Green Pool Algae

Mustard deposits are usually found on the walls, primarily on the shady side of the pool. Unlike brown algae and black algae, this mustard swimming pool algae can be easily brushed away, but it will return without the right kind of swimming pool chlorine, a good pool shock, and a good pool algaecide specifically designed for yellow algae.

I suggest you use granular chlorine, a.k.a. Calcium Hypochlorite, to shock your pool. This kind of pool chlorine has a pH level of 12.

Now, anything over the pH level of 8.0 and you're only using about 25% of the chlorine, which means, you've lost 75% of the active swimming pool chlorine. When you add your pool chlorine, your pH will automatically go up, so get that pH down with pool acid!! If you start the pH a bit lower, you're using more active chlorine than you would if your starting pH was a bit higher.

If you have a DE filter be sure to re-coat the grids with each backwash.

Also watch that the pool’s water level does not get below a minimum of 2” from the bottom of the skimmer.

You want to get rid of the dead algae.

If your pool chlorine is 1.0ppm then raise it to 10ppm or above. You must do this in order to kill the algae. Don’t skimp on the pool shock.

Swimming Pool Chlorine

You must reach that 10ppm or above because if you don’t it’s just wasting time and money. Coming close won’t cut it.

Get a good water testing kit and learn how to use it.

You’ll notice this is working when your yellow to a white or grayish. Also, there might be be dead algae on the bottom of the pool. This can be filtered out through vacuuming the bottom of the pool. Keep brushing and vacuuming to rid the pool and any residual yellow algae and remember to keep filtering and back-washing to get rid of the swimming pool algae.

If you have a DE filter, you'll need to re-coat or recharge the grids with each backwash.

If you have a cartridge filter remember to take the filter out and clean it once per day with a regular garden hose, never a power washer. Brush and filter then brush and filter and then after you do those it’s time to brush and filter some more.

Remember, when you have a swimming pool algae problem, there is no quick fix. It will take time, effort, and patience to clear up your pool.

When your swimming pool chlorine is down to 1.0ppm-3.0ppm the pool will be safe to swim in once again.

Obviously you would NEVER allow anyone to swim in the pool until the swimming pool algae and/or mustard deposits are gone and the water has cleared up.

Chart - Super-chlorinate Your Pool For Yellow Algae
(Amount Needed to Reach 10 ppm)

I like calling yellow algae "ghost algae" because it disappear easily by brushing, but then it comes back the next morning and you say, "Where did that come from?"

Don't let this fool you, because yellow algae will come back again and again unless you take the right steps to rid your pool of this pain once and for all.

After you shock your pool you can use a good Yellow Algae treatment pool algaecide.

Happy Swimming

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Swimming Pool Algae From Yellow Algae
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