Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 13 of 13

Thread: Catching algae early - Do I have to SLAM?

  1. Back To Top    #1

    Advice on optimizing the return to clear

    Checked my levels today and the chlorine was at basically 0. PH was up to 7.8. Lowered PH, put in a gallon of bleach and turned the chlorine generator to Super Chlorinate. Chlorine level is now at 3. But, pool was looking cloudy this morning and has been getting exponentially worse as the day progresses. I think algae is setting in. Since I am catching it early, what is the quickest route to killing the algae and being able to swim again? I will bring the chlorine levels to SLAM levels now and will confirm the algae is gone with overnight test. Do I then wait for chlorine levels to return to below 8 and the water clears? Pool masters, what would you do to remedy the situation I am in quickly? Supposed to be having a party. THANK YOU!
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,966

    Re: Advice on optimizing the return to clear

    Bleach is the way to "SLAM" and kill algae. But we need to know first ... what are you using to test the water?
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3

    Catching algae early - Do I have to SLAM?

    Catching an early algae bloom because I let my chlorine levels creep to nearly 0. Didn't have the SWG turned up high enough. Question, can I just crank my chlorine up to around 8 and try to kill the algae so that we can still swim tomorrow? Or do I need to go through the SLAM process and therefore having to cancel part plans for tomorrow? Thank you.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  4. Back To Top    #4

    Re: Advice on optimizing the return to clear

    I am using the K-2006 kit.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  5. Back To Top    #5
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,966

    Re: Advice on optimizing the return to clear

    Very good. Then since you were low (zero) on FC and you suspect algae has settled (which it probably did), I would SLAM. Knock it out quickly in hopes of having a shorter SLAM. Just make sure you pass the 3 SLAM criteria:
    1. Water is clear
    2. You do not lose any more than 1ppm of FC overnight (that's the OCLT)
    3. CC (Combined Chlorine) is <.5


    On another note .. I guess you'll need to investigate why your SWG didn't maintain your FC for you. Malfunction or just setting error? Super-chlorinate may help, but you might find it advisable to augment with liquid bleach initially as well to help take some stress of the SWG ... just until everything comes back-up to normal.

    Just make sure you keep your FC at SLAM level based on the Chlorine/CYA Chart (link below). You can also post all of your test results if you would like for us to double-check for you.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Catching algae early - Do I have to SLAM?

    I merged your 2 similar threads. Please do not duplicate posts.

    Yes, any sign of algae you need to follow the entire SLAM process. If you catch it early, the process will go quicker.
    EDIT: And a FC of 8ppm is no where near high enough. the shock level depends on your CYA level as seen in the FC/CYA Chart.
    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!

  7. Back To Top    #7

    Re: Advice on optimizing the return to clear

    Yeah, I think I had the setting too low. We had some very mild weather here in Kansas City for a while but the heat and sun showed up. Think it was my fault and not the SWG. Question, since I am catching this early do I need to SLAM? Supposed to be having a family party over here tomorrow and this would definitely cancel it. I know the odds are against me, but wanted to here what possible from someone that knows. ALso, my CYA is at 60. PH at 7.7. FC at 3. Salt at 3200. Thanks.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  8. Back To Top    #8
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,966

    Re: Catching algae early - Do I have to SLAM?

    Yes- SLAM now. Don't wait or it will get worse. The water is still safe to swim as long as you do not exceed your SLAM FC level. At a CYA of 60, an FC of 3 is too low on a regular day. Start now! Have a great party!

    - - - Updated - - -

    Also, use this time before your party to remove any “muck” and debris, scrub all parts of your pool to expose any algae, and vacuum/clean (or backwash) filter as necessary. You may have to do this several times during the SLAM. After that party, make sure you check that FC right away since the swimmer's load will certainly take its toll..
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  9. Back To Top    #9

    Re: Catching algae early - Do I have to SLAM?

    Great news about party. I thought chlorine levels above 8 were to much to swim. Shows how much I know. My pool is 29K gallons. My CYA was at 60 (I need to bump this up a little). According to the chart, my shock level is 24 ppm. That has me putting in 9+ gallons of bleach. I am safe to swim in a chlorine level of 24? Can I swim today, too, as long as the levels do now exceed the SLAM FC level? Do I have to wait any amount of time? LOVE this site and everyone's quick response. Very convenient and extremely valuable. Thanks.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  10. Back To Top    #10
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
    Posts
    12,966

    Re: Catching algae early - Do I have to SLAM?

    As long as you do not exceed the SLAM FC based on your current CYA, yes, it is okay. If your CYA was lower like in a non-SWG pool, then no. But the CYA and FC work together to keep balance. That's why the Chlorine/CYA chart is one of your primary tools in pool care. Just make sure to let the chlorine circulate for a good 30-60 minutes before taking any new tests or hoping in right away.
    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
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  11. Back To Top    #11
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Advice on optimizing the return to clear

    To slam, the FC should be at or above shock level. If you want to try to be clean by tomorrow, then don't try to swim today.

    Yes, safe to swim at any FC under shock level.
    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!

  12. Back To Top    #12

    Re: Catching algae early - Do I have to SLAM?

    Okay, I am good to swim if FC is at or below SLAM value based upon CYA chart. The chart says I need to be at 24. Just checked my levels and they are at 27. Still safe to swim? At what point is it unsafe to swim? Thanks.
    29K Gallon, Concrete bottom/Fiberglass sides, SWG, Sand Filter, 1HP Pump, Gas Heater
    Kansas City, KS

  13. Back To Top    #13
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,998

    Re: Catching algae early - Do I have to SLAM?

    Above shock level no, below shock level yes, at shock level maybe. Howzat?

    I've been swimming in 25 FC all week with CYA at 70 because of the same issue as you, and I only glow at night.

    Kidding!
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

Posting Permissions

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