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Thread: addition of DE filter media, coating the filter completely, just curious

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    addition of DE filter media, coating the filter completely, just curious

    just cleaned my starite/pentair de filter. it takes 7.2 lbs of new DE media. Just curious here, there is 48 sqft of filter screen to cover, how can you be sure that the filter is covered evenly. I mix with water from pool first, then into skimmer with pump running fast, so how do i know the DE stuff doesn't hit the bottom half of the filter, and stay there, instead of going all over the filter. From cleaning before, seems like it is spread out, but it also seems thicker on some parts of the filter, than other parts. Could it be that it falls off when I open up the case to clean it off.
    mid 2014 12 X 30 12k gallons IG Plaster\Fl Gem Finish. StaRite\Pentair DE filter. StaRite\Pentair IntelliPro VS Pump. Pentair UltraTemp Heat Pump Unit. Intellichlor IC40 salt system (not up and running yet)
    Very hard well water-no iron. TF-100 Test Kit (the best)

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    Re: addition of DE filter media, coating the filter completely, just curious

    You'll probably receive more input, but one of the long-standing items highlighted during any DE replacement is to make sure all the air is bled out. The grids must be totally submersed in water in the filter housing to effectively be coated by the DE. Here's a great page: Use and care for DE filters. This is of course assuming that any internal parts (i.e. manifold) were correctly re-assembled. Adequate pump speed is also important. Pre-mixing your DE when only using a single suction source is correct as well. Much of this noted quite well in the link provided. Hope this helps. Have a nice day.
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    Re: addition of DE filter media, coating the filter completely, just curious

    Does your skimmer have a venturi port at the bottom? Be sure to shut off that venturi return before adding your DE.
    10,500 gal IG, Topaz Pebble, auto-level
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    Re: addition of DE filter media, coating the filter completely, just curious

    It's pretty basic. There's more resistance to flow where there is a coating, so the DE-laden water heads for the bare spots. Once they get covered. it finds another bare spot. Eventually it all gets covered. That's why it's important to add enough. When you shut the pump off, of course some DE falls off. When it restarts, the process begins again. In a perfect world, the heavy stuff - sand and such - will settle out while it's all being stirred up.

    It's a sales pitch, but the transparent filter is pretty neat to watch. Jump to about 1:10
    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.
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    Re: addition of DE filter media, coating the filter completely, just curious

    you mean less resistance where there is no coating, I assume? Or am I not understanding?

    - - - Updated - - -

    and, maybe this is not the right thread, but...if the fiber falls off the grid every cycle, wouldn't that allow the various particles that were stuck to the fiber the chance to get mixed up and go through the grid?
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

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    Richard320's Avatar
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    Re: addition of DE filter media, coating the filter completely, just curious

    Quote Originally Posted by BuckeyeChris View Post
    you mean less resistance where there is no coating, I assume? Or am I not understanding?

    - - - Updated - - -
    You are correct. Fixed.
    and, maybe this is not the right thread, but...if the fiber falls off the grid every cycle, wouldn't that allow the various particles that were stuck to the fiber the chance to get mixed up and go through the grid?
    Maybe a little. But the truly microscopic stuff actually passes through holes within the powder. DE or cellulose particles look like a sponge under a microscope.

    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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    Re: addition of DE filter media, coating the filter completely, just curious

    I was using the fiber and I liked the way it really polished the water sparklingly clean. But then I left it a bit longer between backwashing. It became a gooey mess that wouldn't just backwash off. I did a breakdown clean on the filter and washed all away. It made me reexamine my thoughts about cellulose fiber in a pool filter. We are always trying to get all organic matter out of our pool and here we are introducing organic material. If you leave the fiber in the filter just a bit too long the chlorine in the pool water starts breaking it down (just like it does with leaves or other organics in the pool). The fiber begins to form a brownish sticky mass and since it's breaking down, I assume it's consuming your free chlorine and raising your CC. At any rate, after seeing what happens if it's in there too long, I switched back to DE.

    I think I'll start a new thread to discuss this issue.
    chiefwej
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    Re: addition of DE filter media, coating the filter completely, just curious

    That is cool to watch, probably only if your a pool geek though. I hope that guy wasn't saying that only their product calved off the grids when the flow stopped. Years ago, i went to a Sta-Rite seminar, back when Sta-Rite was still Sta-Rite. They had a see through System 3 53sf to show how the DE calved. that was cool too.

    I will say that, that product seemed to "clump" less than DE when coating, and appeared to be a more uniform coat.
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    Re: addition of DE filter media, coating the filter completely, just curious

    Quote Originally Posted by ryker View Post
    just cleaned my starite/pentair de filter. it takes 7.2 lbs of new DE media. Just curious here, there is 48 sqft of filter screen to cover, how can you be sure that the filter is covered evenly. I mix with water from pool first, then into skimmer with pump running fast, so how do i know the DE stuff doesn't hit the bottom half of the filter, and stay there, instead of going all over the filter. From cleaning before, seems like it is spread out, but it also seems thicker on some parts of the filter, than other parts. Could it be that it falls off when I open up the case to clean it off.
    The 48 square foot filter takes 5 to 6 lbs of de. 1 to 1.25 lb per 10 square feet.

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    Re: addition of DE filter media, coating the filter completely, just curious

    <The 48 square foot filter takes 5 to 6 lbs of de. 1 to 1.25 lb per 10 square feet.>

    No, that's not correct---right off the tin foil PLDE 48 plaque on the filter, and right out of the book--pre-coat 7.2 lbs.
    mid 2014 12 X 30 12k gallons IG Plaster\Fl Gem Finish. StaRite\Pentair DE filter. StaRite\Pentair IntelliPro VS Pump. Pentair UltraTemp Heat Pump Unit. Intellichlor IC40 salt system (not up and running yet)
    Very hard well water-no iron. TF-100 Test Kit (the best)

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    Re: addition of DE filter media, coating the filter completely, just curious

    Ok. That's what the manual says. Most of their other filter specify 1 lb per 10 square feet. Don't know why this one uses a little extra.

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