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Thread: Algae not going away with super high FC

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    Angry Algae not going away with super high FC

    I had my pool crystal clear. Then after 1 rain storm the algae started to come. I shocked the pool and it got worse. I am now on my 10th day of keeping the FC above 10 and the water is no better.

    I have tried the phosphate treatment and that has done nothing either.

    I go through this every year and never can tell what the magic bullet is. What should I do now?
    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    Welcome to the forum.

    There is no magic bullet....ever. We would all use it if there was one.

    Phosphates are not relevant to pool management.

    We can only guess at the issues with your pool without a complete set of precise test results.

    Start your transformation by reading "The ABC's of Pool Water Chemistry" up in Pool School. Give up on the magic bullet and arm yourself with the knowledge we teach at TFP.....you'll never look back.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Algae not going away with super high FC

    The closet you will come to that "magic bullet" is your own test kit. I never looked back and never went back to the pool store for water testing. I did stop in the pool store 2 years ago for a new skimmer net. They did remember me and suggested I bring in a water sample. I told them I test my own now. Since I banished the PS my water has been clear and easy to maintain. This is the best community of pool peeps ever! Instead of spending $$$$ at the pool store for stuff that won't work invest those $$ in a good kit. Post the numbers and these guys and gals will help you out.
    17,500 gal. ABG Doughboy Pool
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    Re: Algae not going away with super high FC

    I have my own test kit. I test my own water. However, none of the results are valid because I have so much chlorine in the water to try to kill the algae.

    Before I had this last algae bloom my results were as follows:
    FC: 4.0
    pH: 7.2
    TA: 110
    CH: 90
    CYA: 40
    Water temperature hovers around 76F

    The only reason I go to the pool store is to buy chemicals, although more recently I have bought the Chlorox shock and 3" tabs at Costco. Much cheaper and no sales pressure from the pool store guys. The only reason I decided to do the phosphates killer was from posts from other web sites.

    Question - once the green algae is dead, what color should the water be? I obviously would prefer clear, but while the filter is trying to clear out the debris, would it be grey, green, what? Just trying to figure out if this is all working. Using the overnight FC test does not work for me because my chlorine levels are above 10 and have been for some time.
    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    Quote Originally Posted by HateMyPool View Post
    I have my own test kit. I test my own water. However, none of the results are valid because I have so much chlorine in the water to try to kill the algae.

    Before I had this last algae bloom my results were as follows:
    FC: 4.0
    pH: 7.2
    TA: 110
    CH: 90
    CYA: 40
    Water temperature hovers around 76F

    The only reason I go to the pool store is to buy chemicals, although more recently I have bought the Chlorox shock and 3" tabs at Costco. Much cheaper and no sales pressure from the pool store guys. The only reason I decided to do the phosphates killer was from posts from other web sites.

    Question - once the green algae is dead, what color should the water be? I obviously would prefer clear, but while the filter is trying to clear out the debris, would it be grey, green, what? Just trying to figure out if this is all working. Using the overnight FC test does not work for me because my chlorine levels are above 10 and have been for some time.
    Hi there. Why do you think all tests would be off at FC levels above 10?

    The only test that gets skewed on the higher side at FC above 10 is PH.

    It sounds like you are using granular and dry chlorine products that contain CYA which means you're constantly going to be bringing that up which will require even more chlorine to clear your water. With CYA at 40 your shock level should be 16 and not drop below that until water is clear.

    The OCLT can certainly be done with high FC.
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
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    Re: Algae not going away with super high FC

    Overnight chlorine loss will work with a FC of 10.

    http://www.troublefreepool.com/conte...loss-test-oclt
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Re: Algae not going away with super high FC

    Just measured levels. TA is 90,CH is 200, CA is 50

    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    CA? Did you men CYA?

    Where is for FC now?
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
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    Re: Algae not going away with super high FC

    Yes. Meant CYA

    My FC scale goes up to 5. I diluted the pool sample water with tap water and did 50/50. Measurement shows above 10

    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    Quote Originally Posted by HateMyPool View Post
    Yes. Meant CYA

    My FC scale goes up to 5. I diluted the pool sample water with tap water and did 50/50. Measurement shows above 10

    Sent from my SAMSUNG-SM-G930A using Tapatalk
    To test chlorine accurately in order to follow SLAM process for clearing up algae you really need the fas-dpd chlorine test which will allow you test at much higher levels.

    Pool School - SLAM - Shock Level And Maintain
    18*36*23 true "L" vinyl IG 29,000 gallons. SWG. TF-100 test kit.
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    Re: Algae not going away with super high FC

    how much chlorine is in your tap water?
    27' AG 18K Gallons ~ Cartridge Filter ~ Pentair 1.5 HP Pump

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    Re: Algae not going away with super high FC

    Not sure how much chlorine is in the tap water.

    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    You really should have a good test kit as mentioned above. I use the TF-50 kit and it has served me well. You don't mention your CC level. It should be .5 or less according to the resources on this site. If you do the OCLT and it checks out as well as a lower CC reading I would think you'd be good.
    30' AGP 18,500 GAL, Hayward C4025 4 cartridge filter, BBB Method

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    Re: Algae not going away with super high FC

    HateMYPool " Clorox shock and 3" inch tabs ?.That is not a good thing. please use only bleach on a regular basics or more problems will happen. I have heard the Clorox pool products have copper in them.
    13,995 gallons 24 X 52 / above ground pool.../.SWG/ sand filter/ vinyl liner

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    Re: Algae not going away with super high FC

    So don't use chlorine tabs at all? Or just don't use the Clorox?

    Why is copper bad?

    22K gallon in ground, vinyl lined pool
    Sand filter (zeo-sand)

    Jeramie

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    Re: Algae not going away with super high FC

    The tabs have their place-weekend get aways, vacations, etc. What we teach here at TFP is what does what to your water. Too much of anything is bad. Use the charts and Pool Math to know how much of each thing you should have.

    For right now only us liquid chlorine.

    Copper is bad in that it will build up over time and stain your pool AND your hair! Copper is what makes blonde hair turn green!!

    It is VERY hard to remove so..........best to not use it at all!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: Algae not going away with super high FC

    You will need a FAS-DPD chlorine test. It can measure the high chlorine levels you will need to keep at SLAM level.

    Diluting with tap water isn't accurate and to add to the inaccuracy municipal tap water contains FC.

    You didn't mention which test kit you are using. We recommend the Taylor K-2006 or the TF-100. The TF-100 is the better value. Pool School - Test Kits Compared Since you need to SLAM it is recommended that you get the Xl option: TFTestkits.net
    Karen
    33K IG w spa plaster, Pentair 1HP Whisperflo, DE Filter, SWG CircuPool RJ-60, Dolphin Triton Plus, Raypak Dig 336K BTU, TF-100.
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    2017 replaster/retile

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    Re: Algae not going away with super high FC

    Quote Originally Posted by HateMyPool View Post
    I had my pool crystal clear. Then after 1 rain storm the algae started to come. I shocked the pool and it got worse. I am now on my 10th day of keeping the FC above 10 and the water is no better.

    I have tried the phosphate treatment and that has done nothing either.

    I go through this every year and never can tell what the magic bullet is. What should I do now?
    Rain did not make the algae grow, inadequate FC levels did.

    You posted a CYA of 40ppm, that would require maintaining a FC shock level of 16ppm. Holding FC at 10ppm is just wasting chlorine.

    http://www.troublefreepool.com/conte...art-slam-shock

    Which test kit do you have?

    Without a FAS/DPD FC test you will not have the accuracy to complete a SLAM. It will be impossible to measure an OCLT with a OTO or DPD test, as well as not reading a high enough FC level for the SLAM or an accurate CC level.

    Dom
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    Re: Algae not going away with super high FC

    If you are using tabs and "shock", your CYA is probably higher. What type of test kit for CYA do you have?
    26' X 52" Intex Ultra Frame. Intex Sand Filter
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