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Thread: How many days at shock levels?

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    Join Date
    May 2013
    Location
    Broadalbin, NY (foothills of the Adirondack Mts.)
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    How many days at shock levels?

    I opened my pool two days ago, backwashed and rinsed my filter and gave it an initial shock with a 1lb bag of ProTeam Power Magic AC Superoxidizer (Calc hypoch 47.6%; sodium tet 20.0%) and 12 oz of concentrated algaecide. I didn't test first as I hadn't found my strips yet. There was some brownish powdery substance on the bottom today when I brushed (all very loose and none on the sides) so I think it was probably a mix of some dead algae and pollen (apple trees downwind have been in full bloom this week and there were lots of petals and stamens in the skimmer).

    Today my levels were:
    TH: 250
    TC: 3
    FC: 3
    pH: 8.4
    TA: 120
    CYA: 40

    I added bleach to bring the FC up to 10 and then added muriatic acid to lower the pH to 7.2 and am aerating to try to bring the TA down a bit. The pool actually looks great!

    How many days do I need to keep my pool at shock levels? I want to avoid the algae problems I had last year, so I'm willing to keep it up there as long as necessary, but don't really want to dump more chemicals in there than I have to.
    18' round AG pool; 7600 gallons
    Pentair Sand Dollar filter (sand)
    Pentair Dynamo 1hp pump, 80 GPM (?)
    All newly installed in 2011

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    Isaac-1's Avatar
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    May 2010
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    SW Louisiana
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    Re: How many days at shock levels?

    1, you need to get a good drop based test kit, see my signature, test strips just don't have enough resolution to tell you much of anything, simply too much margin of error.

    Once you have a good test kit you can measure your overnight FC loss and CC level to know if you have an algae problem, then can treat it per pool school link in the upper right if you do. Right now it is anyones guess what is going on.

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    BoDarville's Avatar
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    Jun 2012
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    DFW, Texas
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    Re: How many days at shock levels?

    rfera:

    Welcome to TFP

    Quote Originally Posted by Isaac-1
    1, you need to get a good drop based test kit, see my signature, test strips just don't have enough resolution to tell you much of anything, simply too much margin of error.
    ^ What he said on the importance of getting a good test kit. This is the first thing I would do. Even more critical if you need to go through the Shock Process.

    Quote Originally Posted by rfera
    ...12 oz of concentrated algaecide.
    Algaecide is not needed to shock the pool nor is it needed for day-to-day maintenance. Proper chlorination for your CYA level will prevent algae.

    Quote Originally Posted by rfera
    I added bleach to bring the FC up to 10 and then added muriatic acid to lower the pH to 7.2
    It is better to test and adjust pH when FC is within the target maintenance range for your CYA. Higher FC levels can throw off the results of the pH test which could lead you to overcompensate on it's adjustment.

    Quote Originally Posted by rfera
    How many days do I need to keep my pool at shock levels? I want to avoid the algae problems I had last year, so I'm willing to keep it up there as long as necessary, but don't really want to dump more chemicals in there than I have to.
    Even with a proper test kit, the Shock Process cannot be time-boxed. What the proper test kit will do is prevent you from overdosing and wasting chemicals.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

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