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Thread: Sand Filter media

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    Sand Filter media

    Hi all,

    Pool's been looking good all summer, then one day a couple of weeks ago it started getting a little cloudy and it's just gone downhill since. Had a massive algae outbreak that took too much effort to get under control. And even after that I can't get the water to clear up. The water test says all is okay. Alk drops a little tiny bit now and then but a couple lbs every few weeks fixes that up. The pool shop asked how old the sand is, but I didn't know I'm guessing more than three since I bought the house bout three summers ago. I haven't changed it and I doubt the previous owner did in their last couple of years.

    I don't know for sure the sand is the problem but the pool store is hinting at it. Since I don't know it's age I can't eliminate it. The filter is Triton II tr140, it's huge and tucked away in a corner so it's going to hard to work on. If anyone has any other ideas before I start I'm open.

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    In the Industry

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    Re: Sand Filter media

    - - - Updated - - -

    You might try using DE in the filter first. There's a description in the How to section of Pool School - Add DE to a Sand Filter this site

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    Mod Squad pooldv's Avatar
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    Re: Sand Filter media

    We don't recommend changing sand. It doesn't go bad unless it gets glued together by pool store chems. You can deep clean it, Deep Cleaning a Sand Filter But, normally cloudy water is a water chemistry problem and not a filter problem. DE might help or raising FC halfway between target and shock for your CYA might help also, FC/CYA Chart.
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    Re: Sand Filter media

    My only regret from adding DE is that I bought a big box of it. For a sand filter owner, that's a lifetime supply. I added it to the pool in the final stages of a SLAM. The water is crystal-clear even at night. It's still in there - I never saw enough pressure increase to warrant a backflush, so I likely would've benefited from introducing it earlier to help clear dead algae faster.

    If I had the chance to do over again, I'd find a friend of neighbor with a DE filter and just ask for a few cups from their supply.
    12,000 gal Diamond Brite indoor​ pool. Pentair Triton TR-60 Sand Filter +added DE, Lochinvar Energyrite ERN-200 gas heater, Pentair Multi-valve, Pentair SuperFlo VS pump, TF-100 kit, Pool Math App - iOS

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    Re: Sand Filter media

    Quote Originally Posted by Rollercoastr View Post
    My only regret from adding DE is that I bought a big box of it. For a sand filter owner, that's a lifetime supply. I added it to the pool in the final stages of a SLAM. The water is crystal-clear even at night. It's still in there - I never saw enough pressure increase to warrant a backflush, so I likely would've benefited from introducing it earlier to help clear dead algae faster.

    If I had the chance to do over again, I'd find a friend of neighbor with a DE filter and just ask for a few cups from their supply.
    If you have an herb garden then DE will help keep insects from chomping on the leaves. Just scatter it around the plants.
    Geebot
    Chicago, IL
    30K gal, InGround Plaster Finish, 3.5'-9.5', Maytronics S300 Cleaner

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    Piolin's Avatar
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    Re: Sand Filter media

    Quote Originally Posted by Geebot View Post
    If you have an herb garden then DE will help keep insects from chomping on the leaves. Just scatter it around the plants.
    The garden DE is not heat treated, so is NO Bueno for swimming pool... 😊
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Piolin's Avatar
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    Re: Sand Filter media

    Quote Originally Posted by Piolin View Post
    The garden DE is not heat treated, so is NO Bueno for swimming pool... 😊
    But the pool DE should not be spread in the garden, it's carcinogen if inhaled...
    8,400 gal Intex, 3K GPH pump, 16" sand filter, SWG CG-28669, TF100 test kit, speed stir, K-1766 Taylor salt test.

    The corner stone of TFP
    Pool School - Chlorine / CYA Chart

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    Re: Sand Filter media

    dang. I did some reading on DE in gardens and was pretty excited about that as an option. Most articles don't mention heat treatment.

    I might buy some garden DE for outside use though - sounds like pretty useful stuff.
    12,000 gal Diamond Brite indoor​ pool. Pentair Triton TR-60 Sand Filter +added DE, Lochinvar Energyrite ERN-200 gas heater, Pentair Multi-valve, Pentair SuperFlo VS pump, TF-100 kit, Pool Math App - iOS

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    Sand Filter media

    DE for the pool should be here tomorrow. Let's hope that does the trick. From what I've read I add a little to a skimmer till the filter pressure goes up by one psi.
    Vacuuming seems to just stir up the cloudiness more. Its almost like there's no filter there. If the pressure didn't go up when the pump goes on id think it was stuck in recirculate.The good news ...my wife's suggested fix is to get a robotic vacuum.



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    Re: Sand Filter media

    Just an update for anyone that might be interested. Pools nearly perfect now there is still more than normal sentiment settling at the bottom but nothing anyone other than me would notice

    The DE was doing its job but I could tell it was going to take several day to get it clear. After bout 24 hours with DE in the filter I added a clarifier. The next day it looked much better but still no where near perfect so I added a little more. 72 hours later it looks almost back to normal. Water still test perfect with home kit and pool store test.



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    Re: Sand Filter media

    How did the deep clean go? Was there a lot of stuff in there?
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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