Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 25

Thread: Cover = algae

  1. Back To Top    #1

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Cover = algae

    Hi all,

    I have a problem where as soon as my pool is covered I seem to get either very dirty water or an algal bloom.

    The pool was crystal clear and maintaining correct PH, TA and never got below the recommended FC level for my CYA.

    My would covering the pool cause this problem?
    My FC actually went up during the time the pool was covered (3 days), yet the pool looks dirty with a hint of green.

    I'm hoping its just dirty but I have a feeling it may be the dreaded algae again..
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  2. Back To Top    #2
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Cover = algae

    What type of cover are we talking about, solar ?
    I see in another thread, you were involved in the SLAM Process. Did you follow the process till all three criteria were met ?
    Crystal clear water.
    CC of 0.5 or less.
    Pass the OCLT Test.
    If the SLAM process wasn't followed correctly and stopped before all three criteria were met, you won't have killed all the algae off. Also if it's a solar cover your talking about you'll need to make sure it's clean an algae free.
    Could you post a set of test results ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  3. Back To Top    #3
    Patrick_B's Avatar
    Join Date
    Jun 2011
    Location
    Midland TX
    Posts
    15,001

    Re: Cover = algae

    If it is Algae, you did not have enough FC prior too or after you covered it.

    Simply adding a cover will not induce Algae growth, so your FC took a dip somewhere if you are seeing Algae, cover or no cover.
    TFP Moderator
    Essential Links:
    ABC's Of Pool Chemistry, Test Kits, SLAM Your Pool
    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

  4. Back To Top    #4

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Cover = algae

    Oftentimes if a cover is dirty or already has algae on it, then putting it over pool water depletes chlorine in the water so then algae can grow. Now in your case with an SWG continually feeding the pool with chlorine, the FC went up because the cover prevented some sunlight from breaking down the chlorine. So in your case I suspect that the cover was dirty and just made the water look dull and perhaps had algae on the cover that at least initially has the water look a little green. If you have decent circulation and the FC level is truly higher and staying that way, then it should clear up between the chlorine and filtration.

    To prevent this problem in the future, clean off the underside of the cover before putting it on the pool water.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  5. Back To Top    #5

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    Thank you for all the advice.

    It doesn't appear to be a full algal bloom. I cleaned the filter and ran it all night and the water does appear to be a lot clearer.
    I'll give the cover a good clean today. it is the first time I have used it since I have been testing and maintaining my own pool so you may be right about it having algae and dirt still attached to it. It is the plastic style bubble wrap looking cover, I think it is referred to as a "Solar Cover"


    I keep all my test results and filter time on a spreadsheet I'll take a screen grab and upload my latest lot.

    Yes I did the Slam process, but you are correct I didn't do it absolutely by the book. I'm still not convinced that I actually needed to slam it because a similar thing was happening before. Chlorine levels where always high and I would only get dirty and greenish looking water if I covered the pool for a few days. I was just doing it as a precaution so I could start fresh. The pool did actually look a million dollars for nearly a week prior to me covering it again for boxing day (I went away).

    I have family coming up on the 3rd of January and we would really like the pool to be useable. The weather is forecast is 42degC (107f) so I kinda need it.
    Pool Test Results.jpg
    Pool Test Results.jpg
    Last edited by yabbyfarm; 12-29-2014 at 06:15 PM. Reason: trying to make attachment bigger
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  6. Back To Top    #6

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    doesn't look much better after another 6 hours filtering.

    guess I'm slamming again
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  7. Back To Top    #7
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Cover = algae

    Can you post a pic of the water ? Is it still somewhat green in color ?
    If your going to SLAM let's call your CYA level 90 and your shock level is 35. Turn your SWG off. Drop PH into the low 7's first then bring your FC up to shock level.
    Follow the process to the T this time. SLAM Process
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  8. Back To Top    #8

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    DSC_0793.jpg

    Pool is currently in the shade so doesn't look all that green.
    Is it too late to add acid to lower PH? I know it was at 7.5 this morning
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  9. Back To Top    #9

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    DSC_0794.jpg

    Little more sun in this shot.

    FC is now 35.
    I added 450ml of acid so PH should be around the 7.2 mark.
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  10. Back To Top    #10
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Cover = algae

    It wouldn't hurt to put that cover on for a little while to get some of that shock level chlorine on it.
    The water does look green to me a couple of feet out from the edge. Make sure your pump is running the whole time.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  11. Back To Top    #11

    TFP Guide
    PAGirl's Avatar
    Join Date
    Jun 2012
    Location
    Central PA
    Posts
    2,388

    Re: Cover = algae

    If you measured your PH when you were at a FC of 35 it can read a false high.
    26' X 52" Intex Ultra Frame. Intex Sand Filter
    26' X 52 Intex Ultra Frame Install
    You can lead a horse to (clear) water, but you can't force him to swim in it!

  12. Back To Top    #12

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    PAGirl - thankyou, I am going off of the test result pre-slamming.

    I had the FC level at 35 since about 2pm and made sure it was at 35 again at 9pm. Scrubbed the pool and cleaned the filter.
    Overnight the water has cleared up and the FC level is still at 35 (7am). The sun is just about to hit it.
    I know according to the Slam process it should take longer but it looks to me like its not loosing any more chlorine and the water is clear.

    What is the highest level of FC that you can realistically swim in and not get skin irritation? Its gonna be hot as **** in about 2 days....
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  13. Back To Top    #13
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Cover = algae

    You can swim in FC levels up to SALM level for your CYA level as long as you can see the bottom of the pool. You'll be fine !
    No CC's correct ?
    Sounds like you've made some good progress on clearing the water. Did you put the cover on to get some SLAM level water on it to help clean it up ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  14. Back To Top    #14

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    Nope no CC's either.

    I plan on laying the cover on the lawn and hitting it with the pressure cleaner and some bleach. I don't want it anywhere near the pool until after this hot spell.

    Great so I can stop adding bleach and hopefully the FC level drops a little in the next couple of days.

    I'll be interested to see the test results after the slam because I had to use 750g 65%Cal hypo because I didn't have enough Bleach at the beginning. I still used about 18L of bleach on top of that. I wanted to avoid the Cal Hypo because I already have too much CH in the water.
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  15. Back To Top    #15
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Re: Cover = algae

    Your CH in the last test was 375. Just keep your PH in check and you'll be good. Your TA is good as that will help with the PH rise from the SWG.
    I can understand keeping the suspect cover far away from the pool during the heat wave ! Lol
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  16. Back To Top    #16

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    Pool is turning green again!!!!!!!!

    FC level hasn't got low at all and the CC's have been 0 since the slam.

    currently at
    FC=8
    CC=0
    PH=7.4
    TA=80
    CH=400
    CYA=85

    Please help me before the pool gets filled in.
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  17. Back To Top    #17

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Cover = algae

    Is the water a clear green or is it cloudy green? Do you see visible green algae on the floor or sides? Something about this situation doesn't make sense. Do you have any unusual chemicals in this pool -- any metal sequestrants, clarifiers, flocculants, enzymes, algaecides (i.e. copper), etc.? Also, what is the temperature of the pool water?
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  18. Back To Top    #18

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    I will take a photo of the water once its in full sun today.
    I can see no visible algae, the water looks like a cloudy green.
    Water temperature goes down to around 27-28 at night and the heater turns off at at 32 during the day.

    I have had the solar cover off since the 29th of Dec because I thought it was causing problems, I have since cleaned it with a decent concentration of bleach and have put it back on. The reason being it has been very windy and my pool seems to be filling up with flying deb re from the trees faster than the filter can clear it out. I seem to have to clean out my cartridge filter daily.

    The pool shop had me putting in Clarifiers and algaecides when they where in charge of water quality. Since I drained 30% of the water at the start of December I haven't added anymore pool shop chemicals.
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

  19. Back To Top    #19
    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
    Posts
    4,758

    Re: Cover = algae

    It might have something to do with the algaecide's and clarifier's you added. You stated you did do a 30% drain and refill.
    I'm a little stumped also. Let's see if Richard gets back with something.
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

  20. Back To Top    #20

    Join Date
    Nov 2014
    Location
    Barossa/ South Australia
    Posts
    42

    Re: Cover = algae

    Just went out and pulled back the cover (I put in on last night as an experiment).
    I ran the filter all night with the in-floor cleaner turned off. The water is now very clear and looking good, however there is a lot of dirt etc on the floor of the pool. So I'm guessing half my battle is trying to stop the pool getting so dirty.

    Is it possible that my in-floor cleaner is doing more harm than good?
    50,000 L Fiberglass in ground pool
    SWG
    Cartridge filter + Vantage in floor cleaner
    Not actually a yabby farm, just what it will be if I keep having to spend as much money as I have been to keep it looking good.

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
  •