Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 23

Thread: Algae and "perfect" water

  1. Back To Top    #1

    Algae and "perfect" water

    Noticed a light layer of something in the pool yesterday. I suspect it is algae and not dirt although I am colored blind The cleaner actually leaves tracks for the first time this summer. Foxx pools said my water was perfect yesterday. Can you have algae with perfect water? I run the pump 16 hours a day (now 24) and have an autopilot at 3200 ppm. FC is at 5. I plan to shock later but not sure what to bring the FC level up to. Any other advice? Off to soccer right now but I will be back!

    Thanks
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  2. Back To Top    #2
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Algae and "perfect" water

    Can you post a full set of results? That will help us give you better advice... also it would be helpful if you would update your signature to include your pool specs and equipment. Go to User Control Panel, then Profile, then Edit Signature.

    Welcome!
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  3. Back To Top    #3

    Re: Algae and "perfect" water

    Sorry....
    FC 5
    ph 7.6
    alkalinity 90
    stabilizer 100
    hardness 160
    salt 3200

    Water is clear, just not sparkling like normal if that makes sense. I am armed with 6% bleach but will hold off until I hear something. Autopilot is running on power level 2 and purifier reads 75%. Water temp is 91

    Thanks!
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  4. Back To Top    #4

    Re: Algae and "perfect" water

    signature didn't take....

    inground grecian L, 33000 gallons, 1 hp whisperflo, TA100 sand filter
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  5. Back To Top    #5

    Join Date
    Dec 2007
    Location
    Central New York
    Posts
    504

    Re: Algae and "perfect" water

    Quote Originally Posted by frustratedpoolmom
    Can you post a full set of results? That will help us give you better advice... also it would be helpful if you would update your signature to include your pool specs and equipment. Go to User Control Panel, then Profile, then Edit Signature.

    Welcome!

    First..... What mom said.

    Second..... If the pool is clear and the weather is hot, I would spend a nice quiet hour, this afternoon, at the pool brushing the sides and bottom; then let the kids enjoy the pool for Sat. and Sun. Keep the filter running while the kids are in the pool and all Sat. night. Sun., I would let the kids use the pool all day.

    Sunday night, I would shock the pool and then spend a quiet evening and brush the pool again.


    Third..... What mom said.

    I was typing when you posted.

    FC is at 5 ..... can you read CC?
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

  6. Back To Top    #6
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963

    Re: Algae and "perfect" water

    First, Does your autopilot recommend you run the CYA that high? Maybe the CYA should be a bit lower to be more effective against the possible algae. If it's mustard, you have to run with higher FC levels than normal to prevent it.

    Lastly, What Hotrod said....
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  7. Back To Top    #7
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Algae and "perfect" water

    A CYA reading of 100 tends to not be reliable. The common CYA test will often read levels much higher than 100 as 100. If your CYA level is higher than 100, then your FC level isn't high enough, even with a SWG (which can run at lower FC levels than bleach users can).

    With high CYA levels and a SWG and just slightly low FC levels, it is fairly common to see dead algae settling on the bottom of the pool. This happens when the FC level goes just below the safe level. Algae will start growing, but the FC level is still too high for it to really get going so it dies as quickly as it grows. Appropriate FC levels will kill the algae off entirely, but slightly low levels can never quite kill it all off.

    You should lower your CYA level below 100 by replacing water.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  8. Back To Top    #8

    Re: Algae and "perfect" water

    CYA did sound high so I checked it again (and took a sample to the pool store):

    pool store = 30
    my test kit = 40

    pool store also measured FC at 3 which is lower than what I was getting. I tested again and I am around 4. I really should find someone who is not colored blind to do these tests! So when I do add the bleach what am I looking to bump the FC to? I like the quiet part but obviously you haven't spent much time around my house

    BTW....i think I got suckered at the pool store since I bought a product called phosfree. Tied the recommendation to phospates and my reading was 500 and should be less. Do I need it?

    Thanks
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  9. Back To Top    #9

    Re: Algae and "perfect" water

    Dang....

    CC = 0
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  10. Back To Top    #10

    Join Date
    Dec 2007
    Location
    Central New York
    Posts
    504

    Re: Algae and "perfect" water

    Just wondering..... What kind of test kit are you using?
    Hotrod30

    20 X 40 foot vinyl Borates and Salt Pool
    Rolachem Chlorine Feeder
    Hayward 27 inch sand filter with 80 lbs of pea gravel
    Jacuzzi Splash Pak SP55 DE filter in parallel
    Pentair VF3050 pump

  11. Back To Top    #11

    Join Date
    Jun 2007
    Location
    SouthCentral PA
    Posts
    13

    Re: Algae and "perfect" water

    Quote Originally Posted by rockyboy
    Dang....

    CC = 0
    Not sure if you are upset with those results, but 0 is what you are looking for. Perhaps it is the lack of probable cause that got you down.
    30k gallon inground with vinyl liner
    Hayward cartridge filter
    Southcentral PA

  12. Back To Top    #12

    Re: Algae and "perfect" water

    dang because I forgot to answer the question. Any suggestions on what to bring FC up to with shock? I was thinking 8 or 10. What about the phosphates?

    Thanks.
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  13. Back To Top    #13

    Re: Algae and "perfect" water

    I have a TF test kit
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  14. Back To Top    #14
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Algae and "perfect" water

    Ignore the phosphates, they almost never matter.

    If your CYA level is 40, shock level is 15.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  15. Back To Top    #15

    Re: Algae and "perfect" water

    Kids were gone so I went ahead and shocked last night. FC this morning is 16 and CC is 0. There was a nice layer of algae to brush this morning which I just finished. So, how long does this cycle take place before the aglae quits showing up on everything. I am assuming the shock kills the algae which settles, then brushed and then filtered out.

    Also, I don't get what caused the problem in the first place. Water was always within limits with my TF test kit and also when double checked at the pool store. They suggested vacuuming the algae to waste but that is a huge waste of water with a pool my size. I think brushing cycle will work as long as I quit getting new algae. Thanks.
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  16. Back To Top    #16

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,401

    Re: Algae and "perfect" water

    Hey, Rocky,

    Clearing your pool back to normal is a process rather than a one time event. You must keep your FC up at shock level constantly until....

    A. You hold FC loss to 1.0 or less overnite
    B. Your CC's test .5 or less
    C. Your water is sparkling

    It normally takes a few days to get everything filtered out. Run your pump 24/7. I agree with not vacuuming to "waste"......it really sucks w-a-a-y too much water out of my pool
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  17. Back To Top    #17

    Re: Algae and "perfect" water

    U mean no magic fix? Hadn't really given the chemicals much thought as I was looking for no algae when I brush and sparkling water. (I should check FC each evening and add bleach as required to maintain 15?) So the FC is being used up as it takes care of the algae so if there is a small loss overnite, the algae must be gone....is that the logic? If so then my poor brain is confused because as this algae has bloomed.....my FC was constantly in the 4 to 5 range. No big losses and 0 CC. Just trying to figure out what happened so I can prevent it in the future. Also, if shock level stays up until no FC is lost, how does the FC come back down to the normal 3 to 5 level especially if CYA is holding it. Finally, is it safe to swim at these FC levels?

    I am guessing that temps have something to do with what I am seeing. We have been at or over 100 every day for the past two weeks or so (except a couple of days that were overcast) and the water temp is in the 92 range and the pool gets sun all day until around 7 pm. I apologize again, just trying to ask questions so this makes sense to me.
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

  18. Back To Top    #18
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Algae and "perfect" water

    Hot weather tends to require more chlorine, ie a higher percentage setting on the SWG. The hot weather might have been enough to let the FC level fall just enough for some algae to get started.

    Something has to go wrong for the algae to get started, but once it has started it can often survive even through the SWG is constantly adding chlorine to the pool. Once you have algae, you need to raise the FC level up to shock level to kill it off. It is rare that the SWG is able to do that all on it's own, you normally need to manually add some chlorine to bring it up to shock level, and the SWG can then help maintain shock level from there.

    If the SWG is off, the only thing that will normally change the FC overnight is algae. If the FC level remains the same overnight, then there wasn't any algae for the FC to fight. With the SWG on, or during the day, there are other factors that will affect the FC level.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  19. Back To Top    #19

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    28,401

    Re: Algae and "perfect" water

    U mean no magic fix? Hadn't really given the chemicals much thought as I was looking for no algae when I brush and sparkling water. (I should check FC each evening and add bleach as required to maintain 15?) Yes

    So the FC is being used up as it takes care of the algae so if there is a small loss overnite, the algae must be gone....is that the logic? Yes, you've got it

    If so then my poor brain is confused because as this algae has bloomed.....my FC was constantly in the 4 to 5 range. No big losses and 0 CC. Just trying to figure out what happened so I can prevent it in the future. I can't answer that. The only variance that bothers me a little is your CYA first testing over 100 (which, if true, could explain your algae bloom)and now 40ppm....you seem to have that pretty well resolved, tho

    Also, if shock level stays up until no FC is lost, how does the FC come back down to the normal 3 to 5 level especially if CYA is holding it. The FC will come down typically 2-3ppm daily from the sun....despite that you have CYA in your pool. It doesn't stop the loss, it slows it.

    Finally, is it safe to swim at these FC levels? My opinion is absolutely yes.....others are just a little more cautious

    I am guessing that temps have something to do with what I am seeing. We have been at or over 100 every day for the past two weeks or so (except a couple of days that were overcast) and the water temp is in the 92 range and the pool gets sun all day until around 7 pm. I apologize again, just trying to ask questions so this makes sense to me. I thought your questions were all very sensible and valid.....you're obtaining a good grasp of what's happening in your pool. I'm sorry I can't explain the algae bloom. I would suggest go forward from here and continue to monitor your pool water
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  20. Back To Top    #20

    Re: Algae and "perfect" water

    Thank you for all of the input! The pool is looking much better after several days of shock level. Haven't added bleach since Sunday night and FC on Tuesday night was 11. Not coming down much even with high temps and decent bather load. So, I am prepared to declare victory but I am concerned going forward since I really don't know what happened in the first place. I have gone back to running the pump around the clock at least until the heat breaks and I pushed the autopilot % output up to 90% on power level 2. Any suggestions for what the FC reading should be during this record breaking heat wave?
    inground liner Grecian "L"
    34000 gallons
    1 HP whisperflo, TA100 sand filter
    Autopilot digital SWG, SC-60 cell
    Hayward Colorlogic LED lights

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •