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Thread: Shock before or after draining

  1. Back To Top    #1

    Join Date
    May 2013
    Ottawa, On, Canada

    Shock before or after draining

    Going to close our 27' above ground pool this weekend and was reading the winterizing instructions. I noticed that they suggest shocking before draining the pool rather than after draining as I've been doing the past few years. Seems kinda wasteful (and bad for the environment) to add so much chlorine which you're going to dump in a few hours. Just wanted to know if there's a good reason for shocking before or if I'd be ok to continue shocking after I've drained?
    27' AG Round (~17000 Gallons or 64000 L)
    Hayward 1.5 HP Power Flo Matrix Pump (2 speed usually run 6hrs high 18hrs low)
    Hayward CC150CAN XStream Cartridge Filter (150 ft^2 120 GPM)
    Hayward AquaTrol SWG
    Installed April 2012

  2. Back To Top    #2

    Join Date
    Jul 2015
    Bergen County, NJ

    Re: Shock before or after draining

    This topic was covered in this post:
    53K Gallon Plaster in-ground with ALL Hayward equipment including Omnilogic Automation, Phantom Turbo Cleaner, SwimClear Cartridge Filter, Heater, Dual T-15 Salt cells. TF-100 Test Kit w/Speedstir.

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