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Thread: Newbie here need to Partial Drain and refill

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    Newbie here need to Partial Drain and refill

    How to calculate an 18 X 38 Grecian for partial drain/refill???
    25K
    Sand Filter
    Bleach is my source to chlorinate with

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    pwrstrk's Avatar
    Join Date
    Aug 2012
    Location
    Elverson Pa.
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    Re: Newbie here need to Partial Drain and refill

    Welcome to TFP !!

    Here http://www.poolcalculator.com/

    Why the drain refill ? If you could, put your pool info in your sig. It will help us help you.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Newbie here need to Partial Drain and refill

    Thinking we are having copper problems.
    25K
    Sand Filter
    Bleach is my source to chlorinate with

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    Join Date
    Jul 2013
    Location
    Columbus, Ohio
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    114

    Re: Newbie here need to Partial Drain and refill

    Quote Originally Posted by CalebsDad
    How to calculate an 18 X 38 Grecian for partial drain/refill???
    I have the same size pool although mine actually measures 18 x 37. The corners are 5 foot reliefs.

    18 x 38 = 684 sq. ft. The corner relief subtracts 50 sq. ft. Your pool surface is about 634 sq. ft.

    Water is 7.48 gallons per cubic foot. That means that for every foot of depth you have 4,742 gallons. 634 x 7.48 x 1 = 4,742 gallons. Two feet is 634 x 7.48 x 2 = 9,484 gallons.

    Assuming you have a shallow end, the easy way is to stick a tape measure into the pool against the bottom and measure the water level drop. The other way is to measure from a fixed location like a return or the skimmer.

    My CYA was too high to measure so I'm on my second partial refill of a 16,500 gallon pool. The pool calculator is great, except I have a big shallow end so the average depth is hard to guess. I'm also an engineer and I like the math.

    Hope this helps.
    16,500 gallon, 18" x 38" Grecian; IG Vinyl, Hayward DE

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