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Thread: Algae or not!!

  1. Back To Top    #1

    Join Date
    Jul 2007
    Location
    Montreal
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    21

    Algae or not!!

    Hello everyone....new here and hoping to get some help..
    Been reading the forums for the last 2 weeks and I still can't figure out why I still have black spots on bottom of pool..
    I have a 21' AG pool with a sand filter...(about 4 years old)..and one of those nylon socks for the skimmer....been using chlorine capsules that I put in the skimmer and lasts about 2 days...
    So after doing lots of reading....I went and tried the bleach method....poured 4 x 5 litre jugs of bleach in 3-4 days....1st jug I poured in the late evening....and then in the morning...some of the black spots seemed to have gone away and the pool seemed cleaner....then it rained overnight...and the black spots came back..(even more this time)...not knowing my cholrine levels....I added 2 full cups of granular chlorine and passed the robo-kleen vacuum...kids went swimming this afternoon and the pool was fairly clean....so tonight...come back home and the pool has the black spots again!!!!!
    bought a 20$ test kit and these are my readings
    chlorine-- 0
    Alk-between 120-180 (done with test strip)
    ph-- test strip indicates 7.8 and test kit about 8.0

    The more I read...the more confused im getting!!!...I added 2 cups of chlorine this morning and a couple of hours later....test says I have no chlorine...

    Please help
    Long time BaquaXXX user and hating it,
    15X30 AG, 11,000GAL, Hayward Xtreme filter, SWG in place, conversion almost over!

  2. Back To Top    #2
    TFP Guide

    In the Industry

    Join Date
    May 2007
    Location
    New Brunswick Canada
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    819
    Hi Firefly and welcome to this forum.

    I am sure you will get more information, but in case no one is reading this, this would be my simple minded suggestion, you have to do a chlorine check at nite, then one the next morning. If you have chlorine at nite, and back to 0 in morning, your chlorine is being used up by the algae in the pool, which could be your black spots.

    Other then that, if chlorine levels are the same at nite and the next morning, it sounds to me like you have some metal problems perhaps.

    Hang in there, try what I suggested and if that is the case, you need to get rid of that algae, and until you chlorine levels are the same at nite and morning.

    Rik

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
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    37,887
    We need a full set of test numbers, particuarly CYA, to really be able to help you. A good test kit is the best investment in your pool you can make.
    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

  4. Back To Top    #4

    Join Date
    Jul 2007
    Location
    Montreal
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    thanks for the replies....sent an email to Dave to see if he can ship the test kits to canada...all I can find here is what they have at walmart or at the local pool store...so I bought the most expensive one( 20$) and I posted my test results
    cl=0
    Alk=120
    ph=8

    my test kit has 5 bottles but I dont see any indication as how to test for CYA....
    Long time BaquaXXX user and hating it,
    15X30 AG, 11,000GAL, Hayward Xtreme filter, SWG in place, conversion almost over!

  5. Back To Top    #5
    can you take a sample to a local pool store? (better than nothing!)

    I would suspect that since you have been using the tableted chlorine, your CYA is pretty high, too high for the chlorine to be effective.

    Get the test, and post back.

    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

  6. Back To Top    #6

    Join Date
    Jun 2007
    Location
    Charleston, SC
    Posts
    151
    The fact that your chlorine keeps going to zero means that something is using it up.

    You need to do like everyone else said and get some test numbers asap so you can know how much chlorine you need to add to get it to shock level.
    18' Round ABG (8000 gallon)
    Hayward X-Stream Cartridge Filter
    1.5hp Hayward PowerFlo Matrix Pump
    80 sq. ft. solar panels
    Goldline automated solar controller

  7. Back To Top    #7

    Join Date
    Jul 2007
    Location
    Montreal
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    21
    well I will be ordering a Taylor test kit and will post my readings shortly....
    Long time BaquaXXX user and hating it,
    15X30 AG, 11,000GAL, Hayward Xtreme filter, SWG in place, conversion almost over!

  8. Back To Top    #8
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,963
    Sounds like good ol' black algea....pour a couple of jugs in the pool while you wait for your kit
    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

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