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Thread: I used the bath tub and pool math to calculate bleach strength

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    Mr Bruce's Avatar
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    Mar 2014
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    I used the bath tub and pool math to calculate bleach strength

    Was daydreaming today, be surprised if no one has done this before. I did a brief search but saw nothing.

    I found a gallon jug and timed how long it took to fill. 8 seconds. At first I was going for 50 gallons but my tub wasn't big enough. So I halved everything to 25 gallons.

    8 x 25 / 60 = 3.33 minutes or 3:20 to get 25 gallons in the tub.

    Pool math said add 0.3 oz of 12.5 bleach for FC of 10, 11, 12, and 13 so I figured 12 was close enough to the middle to avoid rounding error. Using the TFT vials I eyeballed 8.8 ml (.3oz) of bleach, did the test and got 22 drops (11 FC)

    It's not the most scientific in the world, but it's close enough for a sanity check. Maybe someone will find this useful.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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    poolnoob.ca's Avatar
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    Re: I used the bath tub and pool math to calculate bleach strength

    yeah, but what's your CYA level?
    32,000L Fibreglass Leisure Pools IG 12.5'x23'x5' Pump: AstralPools BX1 1.0HP
    Filter: AstralPools ZX-310 SWCG: AstralPools VX7T
    Heater: Hayward H250FDN Test Kit: TF-100

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    Mr Bruce's Avatar
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    Re: I used the bath tub and pool math to calculate bleach strength

    0

    It seems to me this is a better method than relying on date codes or labels to determine if you are getting what you are paying for.
    32K gallon Plaster - 1hp Hayward 2 speed Super Pump - Hayward S200 Sand Filter - TF100XL
    Test Kits - Pool Math - Chlorine/CYA/Target/Slam Chart

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