Blue-Green Algae

Remove your blue-green algae for good. Use these swimming pool care and maintenance tips to reduce weekly pool maintenance cost for your in ground, above ground and salt water pool.

This type of algae in pool water is usually present in some way, shape, or form in most pools but is so small that it won't cause any swimming pool problems.

As soon as the chlorine, sanitizer, or pool stabilizer level drops, it's off and running for your swimming pool algae. 

That's why keeping you pool water maintenance will normally keep blue-green algae away to give your the pool perfect for you.

Other pool problems might include a green algae swimming pool, yellow algae/mustard algae, pink algae, and/or white water mold. You’ll need to do a good chlorine pool shock and use a swimming pool algae treatment or pool algaecide.

A good choice would be a "PolyQuat 60" algaecide. It's a bit on the higher side but much better than a copper or metal based algaecide.


Blue-Green Algae/Green Swimming Pool Water Prevention

Proper balance of all your swimming pool water chemistry will greatly reduce the opportunity for blue-green algae pool water.

blue-green algae, blue green water, bluish green pool water, pool algae

You also want to make sure your filter is properly working. 

Get Rid Of Algae & Green Pools


  • Always take the proper precautions in dealing with these types of pool chemicals and read the manufacture’s labels.
  • Use heavy duty rubber gloves and goggles and keep pool chlorine out of reach of children and pets. I use and recommend sodium hypochlorite, or liquid chlorine. Always add the chemical to the water, not water to the chemical.
  • blue-green algae, blue green water, bluish green pool water, pool algae

    If you see that your swimming pool has algae, you must take immediate action in killing the algae.

    First Swimming Pool Care Instructions

    Bring the pool pH, pool alkalinity, and calcium hardness into line. Never add chlorine without first adjusting these three. Adjust your pool pH to 7.0-7.2, alkalinity to 80-100, and hardness to 150-250ppm.

    • Brush the bottom, sides, and steps to loosen any swimming pool algae that may be adhering to the surface
    • Continuously run your filter and backwash once per day. If you have a DE filter be sure to re-coat the grids with each backwash.
    • Keep the water 1/2 way up from the bottom of the skimmer
    • Super-chlorinate, or shock, the pool bringing up the chlorine to 12 - 14ppm and maintain that level. You'll probably have some cloudy pool water but this is normal. Remember that your pool's chlorine demand will be very high. To super-chlorinate you must do this all at once, not over a few hours or days when you have solid green pool water. Only use liquid chlorine or bleach. 
    • There will be dead swimming pool 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 algae and remember to keep filtering and backwashing to get rid of the swimming pool algae. If you have a DE pool filter, you'll need to re-coat or recharge the grids with each backwash.
    • When your swimming pool chlorine is down to 3 - 5ppm the pool will be safe to swim in once again.
    • NEVER allow anyone to swim in the pool until the algae in pool water is gone and the water has cleared up.
    Blue-Green Algae

    Make the adjustment at night, then retest in the morning. Be sure to have the pump running 24/7 and backwash once per day. You can go up to 15ppm, but no higher. Anything after that and you're wasting money and chemicals.

    Once you've gotten rid of the blue-green algae, the swimming pool chemistry is balanced, and the pool water maintenance is complete, can take your family swimming once again.

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