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Thread: Fine Tuining

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    Shelley N's Avatar
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    Fine Tuining

    Okay, my 11,000 AG pool has been open and sparkling since April. I am a strict BBB fan. Here are my #s.

    FC - 6
    CC - 0
    PH - 7.6-7.7
    Alk - 130 red 140 brighter red
    Cal - 70
    Temp - 81

    No matter what I seem to loose 1 to 1.5 ppm of chlorine over night. 9pm last night I had 7.5 chlorine. I have used Ben's kit for 2 years and do the FAS DPD and have never recorded any CC. Never had an algae bloom. Nothin'. This year I DO have a commercial construction site 3 houses away that has been in the dirt moving phase for months and half of it is ending up in the pool. Oh well, it's Colorado and the stuff is fine clay so I'm thinking it's practically as fine as DE so I'm vacuuming it up and using it as a super fine filter additive

    I'm watching the high CYA/Chlorine thread and would like to get to the point where I add 1 cup of chlorine every 2 weeks (HA), but there is the thing about measuring your chlorine loss over night to see how much you loose during the day to see where your pool as at...and I still loose chlorine over night!

    Do you think I have been fighting something ever since owning the pool? I mentioned it is Colorado and we have a thinner atmosphere and are closer to the moon and stars, are they burning it? What is up?

    I also am wondering if I should try to lower the alk or if I should wait for a problem.

    Thanks all.
    Shelley
    Denver, CO

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    Shelly N,
    The pool can use chlorine overnight without visible algae, especially with a heavy bather load. Remember, chlorine kills bacteria. Or it could be nascent algae. I don't think the night time stars are going to burn off chlorine, even in high Colorado How long has this been going on (wasn't that a song)? Anyway, your TA along with the other readings are ok for vinyl. What is your cya?
    Poor Man's Pool
    Doughboy 18 ft round above ground
    7600 gal with center drain
    Pentair sand filter, 1 HP pump
    50 ppm borates
    "I know just enough to be dangerous"
    Pool Calc Ver 1.41 (Excel)

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    Shelley N's Avatar
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    CYA is between 20 and 30.

    What is nascent algae?

    I don't think I've held the same chlorine over night for the 2 years I've had the pool.
    Shelley
    Denver, CO

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    Quote Originally Posted by Shelley N
    CYA is between 20 and 30.

    What is nascent algae?

    I don't think I've held the same chlorine over night for the 2 years I've had the pool.
    That's algae that is just coming into existance, or trying to exist, but the chlorine is killing it the moment it "arrives". Strange that this would continue for that long though. Your posted chlorine level is certainly high enough to prevent problems.
    Poor Man's Pool
    Doughboy 18 ft round above ground
    7600 gal with center drain
    Pentair sand filter, 1 HP pump
    50 ppm borates
    "I know just enough to be dangerous"
    Pool Calc Ver 1.41 (Excel)

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    KurtV's Avatar
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    Shelley,
    How much chlorine are you using during the day (on average)?

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    Shelley N's Avatar
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    After extremely heavy usage last weekend I took it up to 10ppm Sunday night. To maintain after average use I usually add 3-4 qt at night every/every other night depending on how the OTO reads. No one has used the pool for a few days, so I was testing w/ the FAS DPD to see how much my pool uses when I noticed that it dropped over night.
    Shelley
    Denver, CO

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    Quote Originally Posted by Shelley N
    After extremely heavy usage last weekend I took it up to 10ppm Sunday night. To maintain after average use I usually add 3-4 qt at night every/every other night depending on how the OTO reads. No one has used the pool for a few days, so I was testing w/ the FAS DPD to see how much my pool uses when I noticed that it dropped over night.
    I have found, for me at least, that adding chlorine daily instead of every other day results in less chlorine useage overall. Seems that having too much chlorine leaves more of it unprotected by the cya, so it burns off quicker. This however has no bearing on chlorine usage overnight ....
    At your 25 cya, you only need 3.0 ppm chlorine to prevent green algae blooms. Maybe actually lowering your chlorine level will result in less usage. My cya is 25 too, and I bring FC to 5.0 every evening. 24 hrs later it's 3.0 (maybe 3.5 on cloudy days). But mine probably doesn't get as much sun as yours. I dunno ... food for thought?
    Poor Man's Pool
    Doughboy 18 ft round above ground
    7600 gal with center drain
    Pentair sand filter, 1 HP pump
    50 ppm borates
    "I know just enough to be dangerous"
    Pool Calc Ver 1.41 (Excel)

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    According to the Taylor test book, your ALK reading is based on the end color, which is when the color won't change anymore. So 140 is the correct number, at least according to Taylor.

    I have a pool cover, and I'll lose more FC with the pool cover off than on overnight. I'm guessing it is due to organics falling into the water and more outgassing of chlorine with the cover off.
    Location: Atlanta, Georgia.
    Pool: 15,000 gallon 32'x18', 3'-6' deep in-ground gunite pool, Sta-Rite 3 125 GPM 2-filter cartrige, 1.5 HP Sta-Rite pump, solar heater, Goldline SWG, Jandy controls, opaque automatic CoverStar solar pool cover, 3 waterfalls (not from spa).
    Spa: 485 gallon in-ground square acrylic over fiberglass suspended over gunite Sunset brand spa, isolated system, natural gas heater, 2-speed (4hp/11hp) main pump, 3hp booster pump, chlorine sanitized.

    To my pool store owner, nothing is more important than my pool and my money.

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    Shelley N's Avatar
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    Just tested at 8:30pm, and after a cloudy day with the solar cover on, the FAS DPD says we're at 5.5ppm. I'm guessing the high was mid 80s. That means I lost more last night than I did all day. hmmmmmm.
    Shelley
    Denver, CO

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    hi, Shelley,

    You either didn't post a CYA number or I missed it. I think it's time to shock the pool but need that number before we can decide just how much Cl to add.

    Cl is consumed by either organics in the pool or the Sun........nothing else. You seem to have eliminated the Sun so the conclusion is pretty straightforward.

    You seem to have a good grasp on your pool but, remember, shocking is not a one-time dose......it's holding your pool at shock level 'til you experience little, if any overnight Cl loss.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Shelley N's Avatar
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    Hi duraleigh. CYA is 20 to 30. Went from 5.5 last night to 5 this morning.

    What if I don't shock, continue to add enough chlorine to get up to 6 nightly, and just enjoy the pool?

    Shelley
    Shelley
    Denver, CO

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    JasonLion's Avatar
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    .5 isn't that much. That could easily be from blown in dust, leaves, pollen, etc.
    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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