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Thread: To Filter or Recirculate to kill algee (d.e. filter)

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    To Filter or Recirculate to kill algee (d.e. filter)

    First time poster and pool owner! I bought a house with a pool that has not been used for 3 years and has not been covered. I have a D.E. filter that I pulled and cleaned and then added the media and filtered. The first time took about 30 minutes for the psi to go up 8 from the clean state. Since then I have filtered 3 more times backwash/rinse and reloaded media each time and the time since to filter is time to backwash has gone down to about 15 minutes. All that to ask this... Can I just run on recirculate instead of filter to kill the algee and add my bleach this way and do my tests. Just cleaning the the pump and skimmer basket to keep the recirculating going? Hope this makes sense
    16X32 rectangle 22,000 gal vinyl ig ? Hayward D.E. 3620 filter, with 6 position Vari-flo Valve, Hayward Super Pump self priming, 2 return jets and one skimmer, single main drain. Griffin, GA

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: To Filter or Recirculate to kill algee (d.e. filter)

    Yes, you could.

    But eventually, all those algae carcasses are going to have to be filtered out. So the filter's still going to load up. I could see not wanting to lose that expensive chlorine, though.

    Are you possibly overloading the filter with DE? Rule of thumb is 80% of initial fill. I think that's rather heavy, myself, based on how much was stuck to my grids after backwashing - and I didn't have an algae problem!
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: To Filter or Recirculate to kill algee (d.e. filter)

    Its just the nature of the beast with DE filters. They filter really well, so they catch a lot of debris and algae blooms create a lot of debris. That means a lot of frequent cleaning. Backwashing is not very effective with DE filters. I think if you open up the filter and examine the grids after your next backwash you will find a lot of DE still in the filter housing. If that is the case with your filter, then you may need to hose off the grids every other backwash to keep the filter working efficiently.

    If you have a recirculate setting you can do that until the water is cloudy blue and then start filtering again. You could also vacuum to waste at that stage to get rid of most of the algae debris, then filter as usual.
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    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
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