Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Algae on pool wall, safe to swim question

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    Lexington, SC
    Posts
    125

    Algae on pool wall, safe to swim question

    There was a small amount of algae on my deep end wall this morning. I added extra chlorine, brushed the pool, left the house for a few hours. When I came back, all still looked good (water was clear to begin with and the algae wasn't even in its normal spot for when we begin to get an algae problem). I tested the water, FC was 5, brushed the pool again and retested a while longer, still at 5.

    Question: Is it possible the small amount of algae I saw was killed by the chlorine I added and that the pool is safe enough to swim in without SLAMing? Or is the algae ONLY killed at the SLAM level?

    Yes, I'm trying to get away without SLAMing so my kids can swim. Looking for excuses, maybe, but it is an understandable question anyway.
    13,500 gallons
    Sand filter
    IG
    Plaster
    TF-100

  2. Back To Top    #2

    Join Date
    Jun 2015
    Location
    Dames Quarter, MD
    Posts
    6

    Re: Algae on pool wall, safe to swim question

    Here's what I would do: go ahead and let the kids swim right now, then before you go to bed tonight bring your FC up to SLAM level, then test it in the morning, just to be sure all of your algae is gone. My feeling is you probably did kill the algae, but I would do the overnight, just to be sure (so that it doesn't get out of hand if you're wrong). I do not personally believe that a small amount of algae in the water is going to hurt your kids. People swim in lakes with algae, and all sorts of stuff, all the time without getting sick. Not suggesting you swim in swamp or anything, but a clean looking pool that has FC and only had a small amount? Sure, I'd do that.

  3. Back To Top    #3
    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,055

    Re: Algae on pool wall, safe to swim question

    I agree with Tammy.

    One way to tell if you have a real problem....again AFTER the kiddos swim, brush your pool thoroughly floor and walls.

    If the entire pool clouds up you need to do a SLAM for sure. It's possible you have unseen algae (not green) and
    a full brush of the entire surface should determine how much you have.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  4. Back To Top    #4

    Join Date
    May 2012
    Location
    Lexington, SC
    Posts
    125

    Re: Algae on pool wall, safe to swim question

    Thank you both! That was really my thoughts as well, but both my husband and I were kind of on the fence about whether our thoughts hold any validity or not. I'll brush as soon as we get out, and I'll do what Tammy suggests with bringing the level up tonight and see if I pass in the morning.
    13,500 gallons
    Sand filter
    IG
    Plaster
    TF-100

  5. Back To Top    #5
    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,055

    Re: Algae on pool wall, safe to swim question

    Is your CYA level 50 or less? (just wondering about your FC 5 level) Since the algae took hold with the FC being too low.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

  6. Back To Top    #6


    TFP Guide

    domct203's Avatar
    Join Date
    Jun 2015
    Location
    CT
    Posts
    3,375

    Re: Algae on pool wall, safe to swim question

    The proven way to tell if you have anything growing in the water is to perform an OCLT.

    Raise your FC to 8-10 & perform the OCLT. If you lose 1ppm or more you need to SLAM your pool.

    Just because you don't see anything when you brush doesn't guarantee you are algae (or bacteria) free.

    BTW- it is perfectly fine to swim during a SLAM as long as you can see the bottom of the pool & you are at or just below the correct shock level per your CYA.

    Dom
    Dom - TFP Guide
    Intex 18' X 48" Ultra Frame AGP 6700 gallons | Two Intex CS8110 SWG's | Hayward Pro Series 21" Sandfilter | Hayward 1.5HP Power Flo Matrix pump | Hayward Thru-wall Skimmer | Wanda the Whale | 72 sq ft of Sungrabber Solar Panels with Hayward GLC-2P-A | Taylor K2006 Test Kit, Sample Sizer & Speed Stir | Click Here To Become a TFP Supporter!

Posting Permissions

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