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Thread: Drain and Refill Done

  1. Back To Top    #1

    Join Date
    Jul 2012
    Location
    Riverside, CA
    Posts
    51

    Drain and Refill Done

    I drained 75% of the pool water to lower CYA and CH.
    Before:
    FC: 0
    CC: 0
    TC: 0
    pH: 7.4
    TA: 130
    CH: 600
    CYA: 130
    Water is clear. Scaling with yellow algae imbedded.

    Tap water:
    pH: 7.5
    TA: 200
    CH: 200

    After replacing 75% water:
    FC: 3
    CC: 0.2
    pH: 7.7
    TA: 170
    CH: 290
    CYA:40
    Water is clear. Yellow algae still present, but seems reduced much.

    Actions:
    added dry acid to reduce the pH. (target 7.4)
    added chlorine to shock level. (target 15)
    Leave the fountain on to aerate.
    Leave the pump on.
    Will brush once a day.

    Am I on the right track? Thanks everyone for your inputs.
    20,000 gallons, IG plaster, probably built in the 80's.
    Filter: Hayward Pro-Grid DE6020, 120 GPM.
    Pump: Magnetek century E-plus, Purex Triton Whisperflow, WFE-4C, 1HP.
    Fountain booster: Century Centurion A O Smith, CAT B848, 1HP.
    Spa booster: G.E. Jacuzzi pump
    Heater: Raypak RP2100 Digital, Low Nox

  2. Back To Top    #2

    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: Drain and Refill Done

    Yes. Although I would add that if you are testing your chlorine levels using a 25 ml sample, you would be best served switching to the 10 ml sample as it saves you reagent. There really isn't a need to have accuracy down to 0.2 ppm. 0.5 ppm increments will always suffice.

  3. Back To Top    #3

    Join Date
    Jul 2012
    Location
    Riverside, CA
    Posts
    51

    Re: Drain and Refill Done

    Quote Originally Posted by 257WbyMag
    Yes. Although I would add that if you are testing your chlorine levels using a 25 ml sample, you would be best served switching to the 10 ml sample as it saves you reagent. There really isn't a need to have accuracy down to 0.2 ppm. 0.5 ppm increments will always suffice.
    Good tip. Thank you!
    20,000 gallons, IG plaster, probably built in the 80's.
    Filter: Hayward Pro-Grid DE6020, 120 GPM.
    Pump: Magnetek century E-plus, Purex Triton Whisperflow, WFE-4C, 1HP.
    Fountain booster: Century Centurion A O Smith, CAT B848, 1HP.
    Spa booster: G.E. Jacuzzi pump
    Heater: Raypak RP2100 Digital, Low Nox

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