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Thread: Filox backwash - how much is really needed?

  1. #1
    DIY Member pktaske's Avatar
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    Default Filox backwash - how much is really needed?

    The guy at the local water treatment store said to effectivelybackwash 1.0 cubic feet of Filox, I'd need a lot more than the recommended 6.6 GPM to lift the bed. More like 15! Problem is, when I look at the differnt units out there, I don't see anyone publishing anything near that high for a 10" x 54" tank/1.0 ft3.

    I'm barely getting 2 years between my first changeout of the media but I am attributing that to the fact that I'd let backwashing go 3 days usually vs every day or every other day as people have recommended now.

    My iron is high 15+ ppm.

    Do I really need a backwash rate of 15? And whats the best way to test how strong it really is? Thanks guys...Nick

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    In the Trades Akpsdvan's Avatar
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    The weight for the media is the key.. from one site it looks like it is 57lbs just for a half cubic foot..
    Greensand media is 100 per cubic.. and with a service flow rate of 2-5 gpm/sq foot it has a back wash rate of 12gpm/sq foot... so the person is correct in that the one cubic is going to need close to 15gpm for a cubic, don't forget to add the weight of the iron that it is removing.. so if you are doing 7 gpm service flow it will need to be double that for back wash..
    The biggest killer that I see for WaterSoft iron filters is the lack of back wash flow.. the customer has a pump that does 7gpm but the system that they where either sold or bought needs 12gpm...

  3. #3
    That's all folks! Gary Slusser's Avatar
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    A 10" x 54" tank is used for a 1.5 cuft filter or softener. A 1.0 cuft uses a 9" x 48" tank.

    If your well can handle it, you can lengthen the time in backwash and backwash like every night or every other night.
    Gary Slusser Retired (= out of business)
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  4. #4

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    I have a 1cu ft filox filter. I backwash at a rate of 9 gpm. I also have one of those so called 'vortex' tanks that is supposed to help improve backwashing. It has been installed for 2.5 years and during that time I have not noticed any change in its performance. I also backwash every day and I believe that is a requirement to prevent the filox from failing.

    Oh and my iron is between 12-15ppm also.

    -rick
    Last edited by drick; 12-09-2010 at 07:38 PM.

  5. #5
    DIY Member pktaske's Avatar
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    ok...sounds like i need to backwash much more frequently. I also took a look around the web and I don;t see anyone recommending more than 6 or 6.5 GPM top backwash 1.0 cubic foot of Filox™. My jet pump is only 3/4 hp and I doubt can do more than 7 at most.

    Is there an easy way to test?
    Easy for me: while backwashing, time how long it takes to fill a 5 gallon pail. Good?


    Thanks again...

  6. #6
    In the Trades Akpsdvan's Avatar
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    Look to see what the flow control is for your unit, if it is 5gpm then it should fill that bucket in 1 minute if your pump can do that.. if the control is 6gpm then it should fill that bucket in say 50-53 sec....

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