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Thread: Balanced pool still fighting algae

  1. Back To Top    #1

    Join Date
    Jun 2016

    Balanced pool still fighting algae

    Long time reader first time posting. In laws bought a house with a 30,000 gal inground liner, with sand filter. I have a salt water pool and rarely have any issues. Have never had to deal with a manual dose chlorine pool. I have kept the pool balanced but have had to SLAM it twice already to clear it and it still comes back after a few days. We have had way above average rain this year. Is that playing a role? They have alot of trees in there vicinity also. Readings are as follows using k2006

    FC 3
    TC 3
    TA 100
    CH 280
    CYA 30

    I have had zero issues with my SWG pool but am maybe missing something on a chlorine pool? Thanks for the help!

  2. Back To Top    #2
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Balanced pool still fighting algae

    Hello and welcome to TFP! Well, there's no huge chemistry differences between manually adding chlorine (bleach) and the SWG. The only difference is the SWG makes the FC for you from salt and you don't have to carry jugs around. Other than that, same basic principles. The rain may have resulted in some water exchange thereby lowering their CYA. To have algae means that at some point, your in-law's pool saw a drop in FC long enough to allow algae to bloom. So now a SLAM is in order correct? No problem. Just follow everything listed on the SLAM page (link below) and they'll be fine. A couple highlights:
    - Lower pH to 7.2 before starting the SLAM
    - Increase FC to "12" based on that CYA of 30. Maintain the FC 24/7 until all 3 SLAM criteria are passed.

    Follow everything else on the SLAM page and it will work. Good luck!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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  3. Back To Top    #3

    TFP Guide
    cowboycasey's Avatar
    Join Date
    Jul 2013
    Fletcher, OK

    Re: Balanced pool still fighting algae

    Welcome to TFP

    Try going up to 5FC, what you're use to is constant adding of chlorine and now it is added all at once and has to stay above 3 for 24 hours or until you add again.. the trick is to test and add at the same time every day, most do it at night (6pm or so) if you take it to 5FC and the next night it is at 3FC you should be good...

    One thing also, at CYA of 30 in texas it may be low, most people have much better luck at CYA 50 because the sun blows through CYA of 30 and eats your FC (that's why your SWG is working better at CYA 80)

    I hope this helps
    Pool: Intex 16x32 15000 gal, 2 speed 340042, Pentair CC320 Filter, CircuPool SJ45 Salt System, Intermatic PE653RC; Hot Tub: 650 Gal SWG Megachlor
    links: pool school * Recommended-Levels * SLAM * CYA chart * Test kits * How To Post Pictures * Poolmath * OCLT ** Support your website if we helped you :) **

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