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Thread: Cleaned filter after major SHOCK for black alae . . .

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    Plano, Texas (north of Dallas)
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    Cleaned filter after major SHOCK for black alae . . .

    Just wondering . . . after 1 & 1/2 weeks of constant shock level for black algae (looks like it's gone), we just, tonight, cleaned our filters in the pump . . . with new DE added to our filters. Our water is crystal clear and sparkling, but have not had a chance to do the overnight FC test.

    FC level is at 5 ppm right now at 7:30 pm. Should we run the pump all night? I'll do the overnight test tomorrow night.

    Does that sound right? Anyone, please advise if I'm not right in the BBB protocol. Thanks!

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    frustratedpoolmom's Avatar
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    Re: Cleaned filter after major SHOCK for black alae . . .

    Sorry no one seemed to see this. Yes, if you are trying to kill algae you should run the pump and do an overnight test to confirm it's dead. Hopefully you were brushing during this process? That's the correct way to deal with black algae - lots of brushing while at shock level (what's your CYA?). Let us know how the test went, if you did the test.
    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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    Re: Cleaned filter after major SHOCK for black alae . . .

    I'll be doing the overnight testing tonight.

    My question is this:

    I had the pool at shock level for over a week (black algae); brushing with ss brush 2 x per day. When I saw the water was absolutely fantastic looking (never seen it this good, LOL!), I lowered the FC to 3-5 for the last 4 days. I just got my TF-100 tester, so I'm excited to do the overnight testing to see if we got all the algae.

    The FC is at 3 at this moment. Once the sun is off of the pool in a couple of hours, should I add bleach and to what level? Then I'll retest, make note of the level and then retest in the morning before the sun hits it, correct?

    Here's my first test results at 7:00am this morning using TF-100:

    PH = 7.5
    TC = 4
    FC= 4
    CC = 0
    TA = 100
    CH = 420 (I know, no more cal-hypo only bleach!)
    CYA = half way between 20 and 30 on the CYA view tube

    Thanks!

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    frustratedpoolmom's Avatar
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    Re: Cleaned filter after major SHOCK for black alae . . .

    If you look at the CYA chart, you find your "min" and your "target" - you add enough bleach each nite to reach your "target" - use the pool calc to figure out how much that is for your size pool. If that amount nightly doesn't keep you above the "min" by the next night, increase the target by 1ppm. This assumes the FC holds overnight. If it doesn't, you are not done shocking.

    Hope that makes sense.
    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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    Re: Cleaned filter after major SHOCK for black alae . . .

    Thank you so much!

    So, it looks like I need to have the FC at 3-4 for tonight, based on my CYA of somewhere between 20 - 30. That's what I will do and retest in the morning.

    I really appreciate the 'after hours' response! You're the best.

  6. Back To Top    #6
    frustratedpoolmom's Avatar
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    Re: Cleaned filter after major SHOCK for black alae . . .

    Check your PMs top left corner...
    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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    Re: Cleaned filter after major SHOCK for black alae . . .

    Thanks I did, but don't know how to retrieve.

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    Re: Cleaned filter after major SHOCK for black alae . . .

    OK, just retrieved it.

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