Blue-Green Algae: Get Rid Of Algae and Green Pool Water 

Remove your blue-green algae for good. Swimming pool care and maintenance tips to reduce weekly pool maintenance cost. 

Blue-green algae is not the most common type of algae you can get, but it can creep up on you when you least expect it.  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 rarely causes swimming pool problems.  But as soon as the chlorine, sanitizer, or pool stabilizer level drop, 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

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Blue-Green Algae/Green Swimming Pool Water Prevention

The "ounce of prevention is worth a pound of cure" works well with blue-green algae.  Proper balance of all your swimming pool water chemistry will greatly reduce the opportunity for blue-green algae pool water.  You'll want to test your pool water at least once per week, preferably twice.  And of course with a good test kit.  I use and recommend the Taylor K-2006 kit.  Test (guess) strips are easy but will never give you the accurate readings you require.  Another good pool water test kit is the TF-100.  Maintain the right chlorine and pH levels and be sure to brush and vacuum when needed.  You also want to make sure your filter is properly working. 

Warning About Your Pool Liner

You may have read or heard that if you have green pool water you need to doubletriple, or even quadruple shock your pool, depending upon how "green it is".  This is patently and across-the-board false.  By bringing your chlorine level up to 30 ppm, 40 ppm, 50 ppm or higher, you run the chance of bleaching the liner out.  Maybe not the entire liner, but you could have chemical stains, and chemical stains CANNOT be removed off a vinyl liner.  Hopefully you watched the above video.  The water was absolutely filthy and solid green with water bugs, debris, and mosquito larvae.  I didn't "quadruple" shock the pool.   I employed the right techniques and used easy 1st Grade Level Universal Laws of Pool Chemistry & Physics and my F.T.A. Process to clear it up.  There is absolutely no reason to increase your chlorine level to such a dangerous level. 

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
  • 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 150-250 ppm.  If you see that your swimming pool has algae, you must take immediate action in killing the algae. 

    • 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 15 - 20 ppm 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 - 5 ppm 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.

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    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 20 ppm, 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, you can take your family swimming once again.

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