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Thread: How often to backwash DE?

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    How often to backwash DE?

    Any suggestions? Pool Builder says every 4-6 weeks. If my pump pressure hasn't increased, do I need to backwash?
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

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    Mod Squad Bama Rambler's Avatar
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    Re: How often to backwash DE?

    If your pressure hasn't increased and you're fairly certain that your gauge is good you don't need to backwash. There are people here that only backwash once a season.
    Dave J. TFP Moderator
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    Melt In The Sun's Avatar
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    Re: How often to backwash DE?

    Yep, watch your gauge. Some people only backwash once a season, but others have to backwash every week or so, even without any algae problems. It just depends on the quantity and type of debris you get in your pool, and your filter size; your filter is pretty big, so I wouldn't expect you to need much backwashing.
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    Mod Squad zea3's Avatar
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    Re: How often to backwash DE?

    You can see if you have pressure rise, and decreased flow from the returns. They usually occur together but if your pressure gauge is defective you may not see a pressure rise when you have decreased flow. If everything is going well then I would leave it alone.

    Just fyi, if you have a true backwash setting on the filter, it will not release all of the dirty DE. You will recharge the DE after you back wash and over time the DE can build up on the grids. This will require that you open up the filter and hose off the old DE off. If you notice the time between backwashes getting shorter and shorter then DE build up is likely the problem.
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    Re: How often to backwash DE?

    Thanks for all the responses. I learn something with every post! When I do backwash, they gave me this cup from a DE bag and told me to add 10 of them (apprx 10 lbs) of DE. Is there any guideline to how much I should add?
    28K River Sand Plaster Finish - 2.5 HP Stealth Pump - Jandy 60 Sq Ft DE Filter - LAARS LT400 Natural Heater - Polaris 280 - Jandy PDA PS6 Computer Center

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    Mod Squad Bama Rambler's Avatar
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    Re: How often to backwash DE?

    After normal backwashing you should add about 2/3rds to 3/4ths the initial charge amount. So if your initial recommended charge is 10lbs then you'd add 6 to 8lbs after a backwash.
    Dave J. TFP Moderator
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    Mod Squad zea3's Avatar
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    Re: How often to backwash DE?

    Keep in mind it is 10 lbs by volume not by weight. The old method of measuring DE was to use a 1 lb coffee can. They now make DE scoops with the same volume as a 1lb coffee can. For a full charge add 10 scoops of DE, for a partial charge add 6-7 scoops.
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    Re: How often to backwash DE?

    I'd be willing to bet that the scoop they gave you is .75 lbs.

    10 of them would = 7.5 lbs which would be right for a 60 sq ft Hayward filter, however- the Jandy DEV 60 takes 6 lbs clean I suggest checking the manual or the outside of the tank, there should be a label saying how much DE to add to a clean filter

    You might find some helpful info here
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