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Green Pool Water

Green pool water and pool water maintenance. No mistakes for swimming pool chemistry and the pool perfect for you.

Algae Prevention ~ Clear Up Pool Algae ~ Chlorine Chart

Answers To Common Questions



If the proper steps of swimming pool chemistry and pool water maintenance are not taken to avoid, eliminate, and control your pool algae, it can reproduce like rabbits and drive up your pool maintenance cost.

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Green Swimming Pool Water


The most common complaints among pool owners are swimming pool algae and green pools.

Swimming Pool Green Water


You’ll need to chlorine shock the pool and use a swimming pool algae treatment or pool algaecide.

If your pool water is green, follow the swimming pool maintenance tips on the bottle of the algaecide.


Swimming Pool Algae Prevention

Properly balancing all of your pool’s chemicals will greatly reduce the opportunity to turn your pool water green and give you clear pool water. You can treat brown algae pretty much in the same manner as green algae. Black algae is a different animal all together.

Having your swimming pool chlorine, pool alkalinity, and hardness adjusted correctly is very important. Remember to brush and vacuum your pool because this will reduce the dirt accumulation and algae pores from sticking to the pool’s surface. If you have yellow algae, you'll probably brush it and think it's gone, but it will come back.

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FAS-DPD K-2006 Taylor Test Kit

Algae Swimming Pool - Clear It Up

When the time comes to clear up your green pool water it's always safety first.

  • Always take the proper precaution in dealing with these types of pool chemicals and read the manufacture’s labels and the dangers of chlorine.
  • Use heavy duty rubber gloves and goggles and keep pool chlorine out of reach of children and pets. Again, I recommend using granular chlorine a.k.a calcium hypochlorite.

    It’s easier, a bit safer, lighter in weight, easier to store, and 1 pound of granular chlorine equals 1 gallon (8lbs.) of liquid.


  • Chart - Super-Chlorinate Your Pool
    (Amount Needed to Reach 10 ppm)

    Type Of Swimming Pool ChlorinePOOL GALLONS
    1,000 5,000 10,000 12,00015,000 20,000 25,000 50,000
    Sodium Hypo10 oz. 1 3/4 qts. 3 1/4 qts. 1 1/4 gal. 1 2/3 gal. 2 gal.4 gal. 6 gal.
    Lithium Hypo 4 oz. 1 1/4 lbs. 2 1/3 lbs.3 1/2 lbs. 4 3/4 lbs. 6 lbs. 12 lbs 18 lbs.
    Dichlor2 1/4 oz. 11 oz. 1 1/3 lbs. 2 lbs. 2 2/3 lbs. 3 1/3 lbs.6 3/4 lbs. 14 lbs.
    Calcium Hypo 2 oz. 10 oz. 1 1/4 lbs.2 lbs. 2 1/2 lbs. 3 1/4 lbs. 6 1/2 lbs. 13 lbs.


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    Swimming Pool Chlorine - Liquid & Granule


    Best Pool Water Maintenance

    If you have green pool water, you must take immediate action in killing the algae. Doing this will lessen the risk of swimming pool stains and will lengthen the pool water life.

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    Pool Green Water

    First You should:

  • Bring the pH, pool alkalinity, and calcium hardness into line. Never add chlorine without first adjusting these three. Adjust your pH to 7.0-7.2, alkalinity to 85-100, and hardness to 150-250ppm.

    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. For parts of the country that might have hard water, liquid chlorine will do just fine.

  • Brush the bottom, sides, and steps to loosen any algae that may be adhering to the surface. Also, get a good leaf rake, not a simple blue skimmer. Be sure the bottom drain is clear from debris.
  • Continuously run your filtration system and be sure to backwash 2 times per day until the water is clear once again.
  • 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.

  • Super-chlorinate, or shock, the pool bringing up the pool chlorine up a minimum of 10 times what you normally run
  • If your chlorine is 1.0ppm then raise it to 10ppm or above. You must do this in order to kill the algae.

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

    To super-chlorinate you must do this all at once, not over a few hours or days. If you're running your chlorine at 1.0ppm, then bring it up to 10ppm or even 12ppm..

    You’ll notice this is working when your water turns from green pool water to white or grayish. Also, there will 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 algae and remember to keep filtering and backwashing 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 two (2) times per day with a regular garden hose, never a power washer.

    Brush and filter, then brush and filter, and then after you do those, well you guessed right, it’s time to brush and filter some more.

    Remember, when you have green pool water or any 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 green pool water is gone and the algae has cleared up.


    Go To:

    Swimming Pool Algae From Green Pool Water
    Link To Top




    What Other Visitors Have Said

    Click below to see contributions from other visitors to this page...

    I Can't Get The Green Out Of My Pool  starstarstarstarstar
    I have an Intex abg pool, 4,400 gallons.

    CHL - 3
    BR - 6
    PH - 8.2
    alk - 33
    hardness - 80
    cya - 30

    Cartridge filter

    My pool is green, looks ...

    I Can't Get All The Algae Out!  starstarstarstarstar
    First, the conditions: I have an inground, lined pool about 36'x18' and approximately 25K gallons. The liner was new in 2010. I do not have any leaks ...

    Stable High Free Chlorine But Still Green Water  starstarstarstarstar
    I have a 15,000 gal pool with a chlorine feeder that I keep filled with tri-chlor tablets.

    My pool has been in good balance for weeks (pH 7 - 7.4, free ...

    Battling Green Algae  Not rated yet
    Green algae took over our pool a few weeks ago. I've been trying to clear it up before closing the pool for winter.

    Yesterday I added approx. 10 lbs ...

    From Green to Scream  Not rated yet
    This is our story. We have an inground 16k gallon pool that has been in place for about 20 years. There has never been an issue, until last year.

    Last ...

    Why Can't We Get Rid Of This Dark Green Stain  Not rated yet
    Our pool has a dark green stain on the sides and it just won't come off. When it appears that we made a difference in the condition, the next day it is ...

    Pool Water Cloudy & Green & Turned Water Milky White  Not rated yet
    1st Reading

    PH IS HIGH 8.4
    alkalinity high 180
    free chlorine just on the ok
    stabilizer 30-50

    First time having to deal with pool issues not ...

    Green Pool..Lots Of Chemicals, Metals & Algaecides  Not rated yet
    Pool was nice and blue.

    When we didn't have any rain for a while, I added water and we have well water well.

    It started to get cloudy then went to ...

    Green Pool Water. It's Blue But Still Coudy  Not rated yet
    We are getting a late start opening our pool this year because we were out of town for a while.

    When we began the pool was green and cloudy.

    We ...

    Cloudy And Algae In Pool  Not rated yet
    we have a 18 x 48 Easy Set pool.

    We used it last year and had no problems except with bugs on top of water.

    This year we bought a skimmer to try ...

    14,000 Gallons Of Creek Water..Turned Brown Then Green  Not rated yet
    We live in country, no city water, no one would bring in water for us.

    We rented a pump and pumped our new pool full. Intex 16' x 32' x 52".

    I'...

    Started A Green Pool Covered In Algae...HELP!!  Not rated yet
    Two weeks ago I started with a pool that was green and covered in algae.

    Pool size is 33 x 22 x 4 ish above ground...

    14 gallons of shock, 2 buckets ...

    Green Water From Salt Water Above Ground Pool 16 X 33   Not rated yet
    My husband brought the salt water pump and salt from Walmart and changed our pool over to salt.

    He added more salt and also change the sand to see ...

    Help Clearing Up Green Pool With A DE Filter  Not rated yet
    The pH is o.k. and hardness o.k.

    I have a 17,500 gallon pool using Baquacil. I added 4 bottles of shock, 5 pints of sanitizer, and 2.5 oz. of algaecide....

    Above Ground Pool Turned Brown Then Green  Not rated yet
    I put a 15' x 48" pool on the 3rd of June was filled 18 hours later.

    We have well water so the water was orange. I took a sample to Pinch a Penny they ...

    Why Can't I Clear My Green/Blue Pool Water?  Not rated yet
    Our in ground 22,000 gunite pool has been impossible to get completely clear.

    It started very green a month ago and after shocking it several times ...

    How To Clear Up A Green Pool In Woburn  Not rated yet
    New Question

    I opened 28,000 inground pool 2 weeks ago.

    Water was slightly green so I added 4 lbs. of Green Out and shocked with 6 lbs. of ...

    Pool Water Light Green Color  Not rated yet
    Pool 4x15 above grnd 6-7000 gals?

    Free chlorine 0 low?

    pH 7.4 ok?

    Alkaline 40 low

    Stabilizer 0 low?

    With shock added twice

    Filter(...


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