Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: New SWG - Need help with #s - Algae problem? (Test result #s included)

  1. Back To Top    #1

    Join Date
    Jul 2014
    Location
    PC, FL
    Posts
    9

    New SWG - Need help with #s - Algae problem? (Test result #s included)

    I recently added a SWG to my above ground pool. I followed the instructions and added about 50lbs of pool salt to my pool and ran the pump overnight. Prior to adding the salt there was no signs of algae in the pool. When I checked the pool in the morning algae had appeared (SWG had not been running at this point). After 24 hours I started the SWG and ran it in boost cycle to "shock" the pool due to the algae. The algae didn't go away on its own. I took a trip to the local pool store and my water readings are below. They said the algae was most likely mustard algae and gave me a sodium bromide chemical to get rid of the algae.

    FC: 12.35 ppm
    TC: 12.35 ppm
    CC: 0 ppm
    pH: 7.6
    Hardness: 144 ppm
    Alkalinity: 121 ppm
    Cyanuric Acid: 48 ppm
    Copper: 0.1 ppm
    Iron: 0.1 ppm
    Borate: 10 ppm
    Salt: 3800

    My questions -

    1. How do I get the FC level down? Will it naturally come down with normal operation of the SWG after my initial boost/shock of the pool?
    2. I added the Sodium Bromide to the pool after scrubbing the algae (it easily came off) and vacuumed the bottom of the pool. What do I do now? Do I give it a day or two and see if the algae returns, do I keep adding more sodium bromide in 24 hours?
    3. What possibly caused the algae and how can I prevent it in the future?
    4. Any additional advice/comments regarding my #'s or anything in general would be greatly appreciated.

    Thanks!
    Intex 12'x30" (~2100 gallon) above ground vinyl pool / Intex krystal clear saltwater system / Intex 1000 gallon pump /

  2. Back To Top    #2
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: New SWG - Need help with #s - Algae problem? (Test result #s included)

    1. You do not need the FC to come down, you need to raise it higher and follow the ShockLevelAndMAINTAIN Process to eradicate the algae in the pool.

    2. I do not know what that stuff is exactly. You need to use liquid chlorine and follow the SLAM process until you pass the 3 criteria to stop. This will require one of the Recommended Test Kits that has the FAS-DPD chlorine test.

    3. The ONLY cause of algae is letting the FC get too low for the amount of CYA in the water according to the FC/CYA Chart.

    4. Get a test kit. Stop trusting the pool store. Start reading Pool School beginning with these:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    How to Chlorinate Your Pool

    EDIT: Although now seeing your signature that this is a small pool. The easiest path forward is to drain and start over and maybe follow the temporary pool guide: http://www.troublefreepool.com/conte...emporary-pools
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  3. Back To Top    #3

    Join Date
    Jul 2014
    Location
    PC, FL
    Posts
    9

    Re: New SWG - Need help with #s - Algae problem? (Test result #s included)

    Decided to drain the pool and start over. Going to wipe the interior down with a bleach solution to kill any bacteria/algae etc. and then start from scratch.

    This is what the algae looked like on the bottom of the pool:

    Intex 12'x30" (~2100 gallon) above ground vinyl pool / Intex krystal clear saltwater system / Intex 1000 gallon pump /

Posting Permissions

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