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Thread: New convert to BBB just lowered CYA & starting fresh

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    New convert to BBB just lowered CYA & starting fresh

    We went through a couple of partial drains & refills over the last 24 hrs & have succeeded in lowering our CYA to 44. YAY! We have not yet added any chemicals & have completely removed all tri-chlor pucks from the auto feed and skimmer baskets. Here are my current numbers:

    CYA 44
    FC 0
    CC .2
    TA 80
    CH (don't know because I ran out of reagent in my K-2006)
    ph 7.4

    What balancing (if any) do I need to do? Based on reading the forums, I think my targets for TA, ph & CH may have changed from pool store recommendations. What are my targets?

    I KNOW THAT I HAVE TO ADD BLEACH TO RAISE FC, but thought I should do that tonight & raise to shock level...esp. since the problem that caused me to convert to BBB & do all the draining to lower CYA was because I couldn't maintain FC over .2 no matter how much chlorine I added. Is that the right approach?

    We would really love to swim. We have had weeks of really high temps & bright sunlight on the pool all day. Is it realistic to hope that we can swim tomorrow if we shock successfully tonight?
    Thanks for your help!!!
    21K gal. inground with dark colored plaster, spillover spa & rock waterfall
    Jandy DE filter, Aqualink control system,
    non-SWG; switching from automatic feeder of tri-chlor pucks to manually chlorinating with bleach

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    Re: New convert to BBB just lowered CYA & starting fresh

    1. visit pool school link

    2. Locate the FC/CYA chart to see your target level of FC for a CYA of 40ish.

    3. Use the pool calculator to calculate how much bleach to add to raise your FC to the target level given your pool volume.

    No need to shock unless you suspect algae. You couldn't maintain FC because your CYA level was so high that the chlorine was bound (and not free).
    15X30 AGP, Lomart beaded liner;
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    Mod Squad woodyp's Avatar
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    Re: New convert to BBB just lowered CYA & starting fresh

    D'ONT WAIT! Everything is good to go but the chlorine. Don't shock yet! CC indicates no need to. Get about 6 ppm based on your cya level and gallons. Looks like 261 ounces to start--- a little extra won't hurt.. Pour slowly in front of a return 2 minutes per gallon. Let the pump run 3 or 4 hours at least. GET some chlorine in there and swim! (after an hour or so anyway). Quit reading and go get some bleach as soon as you calculate how much you need! Grab 3 or 4 extra gallons to boot while you're at it. Enjoy, and welcome.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
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    frustratedpoolmom's Avatar
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    Re: New convert to BBB just lowered CYA & starting fresh

    Yeah, your other numbers look good.
    If the water is clear, you don't need to hold off swimming. That being said, you should add enough bleach to reach your target, wait 30-60 mins and verify your FC is there, add more bleach if necessary, repeat testing procedure until the FC is holding at your target level. Then tonight do an overnight FC loss test. If the FC holds overnight, you don't need to shock. But I wouldn't swim until your FC is in the recommended range.
    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
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    Re: New convert to BBB just lowered CYA & starting fresh

    I would put 3-5ppm FC in the pool via bleach and swim immediately. Once you have the FC in the pool, the pool is balanced and ready to go. Check FC again after you swim to see how much is left and calculate a dose big enough to bring it back up to 5ppm FC.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: New convert to BBB just lowered CYA & starting fresh

    Thank you all for your replies! I added bleach yesterday afternoon to raise FC to 6ppm (with CC .2ppm) and we swam last evening. It was lovely!

    I did the FC loss test last night. At 8pm, FC was 5.8 with CC .2. At 8am this morning, I got FC 4.2 and CC 0. I was a little bummed that the FC loss was greater than 1ppm. Is my loss of 1.6 a concern? But I was psyched that the CC went to 0. I added enough bleach to raise FC back to 6ppm this am & will see how it holds through the day. My current CYA is about 35.

    I read Pool School and got the target ranges for TA, CH, pH, etc. But I'm a little confused by what MY specific targets are and the impact of the spillover spa, waterfall & dark plaster. My pool store gave me a target of 120-150 on TA, the Taylor test kit book has a target of 80-120, and I got used to aiming for about 120 because the tri-chlor pucks seemed to lower it pretty regularly. So, do I aim for 70-90 or 60-80? Pool School says
    Pools with plaster surfaces should factor their CSI into the preferred TA level decision.
    Not sure what that means. For CH, I was always aiming for about 200 for fear of scale and having to drain if it got too high, but Pool School recommends 250-350 for plaster. And I read in Pool School that
    Aeration will tend to cause the pH to rise. This can be mitigated by lowering TA
    So, I'm thinking that my new targets are: TA 60-80, CH 250-350 and ph on the lower side of the 7.2-7.8 range (ideally about 7.4) Does that sound right?

    Thank you again! I really appreciate your replies.
    21K gal. inground with dark colored plaster, spillover spa & rock waterfall
    Jandy DE filter, Aqualink control system,
    non-SWG; switching from automatic feeder of tri-chlor pucks to manually chlorinating with bleach

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    JasonLion's Avatar
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    Re: New convert to BBB just lowered CYA & starting fresh

    An overnight loss of 1.6 is a cause for concern. Given everything that is going on, I wouldn't worry about it too much unless it does that again tonight. For now, just raise the FC level a little higher than you otherwise would and hope that it goes away tonight.

    If you follow the recommended levels chart at Pool School you don't need to worry about CSI at all.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Richard320's Avatar
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    Re: New convert to BBB just lowered CYA & starting fresh

    Order up some reagent refills. Heck, toss in a speedstir too. Keep a log. In a couple weeks your pool will be the envy of all who see it and you'll spend no more than 2 hours a week on it - and the huge majority of that will be brushing and vacuuming!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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