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Thread: Water flow slows too soon after backwash

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    Water flow slows too soon after backwash

    The water is clean and there are no problems with debris so I think something else is happening. Just to make things clear about my situation I would like to explain that my valve on my sand filter leaks to backwash pipe when the valve is in the filter position. I installed a gate valve to stop the leaking but did not fix the spider valve at the time since the pool company said that the gasket on my multiport valve was not replaceable in my sand filter. I don't know if this could be related to my issue now or not but my flow rate decreases sooner than it use to and I find myself backwashing more often it seems. The sand filter is a Hayward S220T. the sand to my knowledge has never been changed and it would be 4 or 5 years in service. I don't know if changing the sand would be advisable or not. Any suggestions would be appreciated. Thanks Jim
    27 foot round above ground

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    Charlie_R's Avatar
    Join Date
    May 2013
    Mexico, MO

    Re: Water flow slows too soon after backwash

    Have you done an OCLT? Many times the water will be clear and almost sparkly at the very start of an algae bloom, yet your filter will clog up fairly quickly.

    Post your current test results, full set, then do the OCLT.
    15'x48" 4500 gallon Intex pool, buried 1.5 ft. Pac-Fab Dynamo 3/4 hp pump. Hayward S180T sand filter, bought used. Taylor K-2006 test kit. Rocket mass heater based wood fired pool heater.

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    Re: Water flow slows too soon after backwash

    Haven't done a OCLT but will tonight. I have been maintaining the FC at between 3 and 6 as the daily test dictate. Ph is kept at 7.5 to 7.7 and it stays pretty stable in that area. I rarely have to increase it. Pool place said it is about time that I should change the sand in the filter(about 5 years) as it gets worn by now and doesn't filter as effectively. Is there anything to that? Thanks for the reply.
    27 foot round above ground

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Water flow slows too soon after backwash

    Sand is millions of years old, it does not wear out in a filter where it is rarely even moving (only during backwashing).
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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