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Thread: Not happy with Sand Filter

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    Not happy with Sand Filter

    Hopefully I'm in the right section in posting this so with that..... For over 12 years, I had a 27' above ground with DE filter in NH, Never had any issues and now that we moved (2014) to SC, we got a 16x32 inground with a sand filter and not very happy. I keep having dirt (Dark brown in color) the next day after cleaning the pool. I would than put my pool rover that I had for my above ground (It does good) to clean it back up and the next day again brown dirt on the bottom. It is Dirt, It's grainy when I inspect it in my pool rover bag. Soooo, does that mean the filter may not have enough sand in it and allowing the dirt back into the pool? I bought some unions yesterday so I'm about to cut the pipes and open up the filter, empty it, clean it, and put new sand in it unless you (the Pro's) think it's a waste of time.

    Thanks
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    needsajet's Avatar
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    Re: Not happy with Sand Filter

    Here's a couple of links you might find helpful. Also, you can remove one of your return eyeballs, and put a nylon knee-high over it, then put it back in. That helps verify if it's dirt coming back from the filter.

    Pool School - Maintenance and Cleaning of Pool Filters
    Deep Cleaning a Sand Filter
    Pool School - Add DE to a Sand Filter

    A couple of other things: Don't backwash until your dirty pressure is 25% above your clean pressure. Also be sure to rinse enough after backwashing.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Texas Splash's Avatar
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    Re: Not happy with Sand Filter

    If you're getting a significant amount of dirt back in the pool, it's possible that there's an issue with one of the laterals or the stand-pipe they connect to. There could also be an issue with the spider gasket at the multiport valve. If you do open the filter, you could remove and save the sand. Sand generally lasts forever unless it was compromised with some pool store junk. Get down to where you can remove/inspect the laterals and stand pipe. Perhaps you'll find the culprit, then can simply replace the sand. Of course make sure to have the filter about half full of water before adding the sand to prevent the weight of the sand from breaking a lateral as you fill the filter back up. If you do get new sand, always make sure it's #20 silica sand designed for pool use.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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    Re: Not happy with Sand Filter

    First, congrats on moving to SC, that is where i grew up.
    Is the dirt localized around where you would expect it to be if it were coming out of your return jets? is it mainly near your steps (assuming you have some). I had a problem with sand/dirt that i initially thought was coming out of return jets which was easily visible on the white steps but it turned out to be sand coming out between the top of the liner joint and the coping. Easily determined by splashing water near that joint and noting whether sand comes out. just a thought.
    30000 gal inground vinyl liner;sand filter w/glass media, nuvo uv, TF-100 test kit; 25 years on Baquacil, converted to TFP chlorine in 2016

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    Re: Not happy with Sand Filter

    First thanks for the quick replies.

    Now Needsajet, Thanks for the links.. Forgot about adding DE to sand. I probably going to do that ALSO I don't ever think I ever seen my pressure rise. Last time I backwashed and rinsed was back when I started everything up and that was back in early March.

    Texas Splash, when they put the sand in the filter they never added any water and now that I just looked at the side of the filter is says to add water before adding sand.. Hmmmm

    Pookiesunshine, Thanks.. Loving it here. Anyways dirt is pretty much everywhere... On steps, deep end mostly, and scattered here and there..

    I'm thinking removing the sand, cleaning the tub or whatever u call it, and adding new sand and DE with link provided..
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    needsajet's Avatar
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    Re: Not happy with Sand Filter

    Does the pressure gauge drop from it's operating pressure down to zero when the pump is off?

    It would surprise me if actual pressure hasn't gone up since March. Could be a worn out gauge. How often do you backwash it?
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Re: Not happy with Sand Filter

    Since you have verified it is dirt and not sand, also that it probably is not coming from joint between top of liner and coping, it might be from a break in one of your lines. try putting the valve in recirculate to bypass the filter and see if you are still getting the dirt.
    30000 gal inground vinyl liner;sand filter w/glass media, nuvo uv, TF-100 test kit; 25 years on Baquacil, converted to TFP chlorine in 2016

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    Re: Not happy with Sand Filter

    You might also put a knee high stocking or something similar over a return and see if you are catching the debris there. That would show that it is coming through the filter. There's always the possibility that it's blowing in from somewhere else, or birds or other wildlife are carrying something into the pool.
    TFP Moderator
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    Re: Not happy with Sand Filter

    Thanks again for the quick replies... Gauge is brand new.. My third one.. For some reason it doesn't last through the few days of freezing weather we have here in SC. It does go to 0 when shut off and this dirt issue been going on since pretty much day one. Just got back from the pool store and bought sand.. She did ask me if I live near fields which I do. Farm behind my house and also my neighbor does have no grass so I do suspect some dirt coming from my neighbors yard..

    I will clean my pool again today and afterword's will put it in recirculate mode for the evening to see what it looks like in the morning.. Also will try the stocking.. Thanks again
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    Re: Not happy with Sand Filter

    Well I took the sand filter apart.. Before I sucked out the sand, I marked where the sand was and than I cleaned everything out. Everything looks good.. I rinsed everything and started putting in the new sand (Yes I filled it half way full of water). I noticed when I got 3 bags in, it was exactly where it was originally. So obviously I added the 4th bag 200lbs like it calls for.. So the question is, could that be one of the issues of dirt coming back into the pool? Also after all these years, my pressure gauge never seen over 10 psi and now its at 14. Darn pool store screwed me of a bag, LOL...
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    needsajet's Avatar
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    Re: Not happy with Sand Filter

    How did the laterals look when you had the sand out? If you like, you can google your filter model and usually find a manual which will have the amount of sand listed.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Re: Not happy with Sand Filter

    Laterals looked perfect.. I inspected every inch every piece and no damage at all.. Side of filter it states 200lbs and the sand I purchased had my model number on it and stated 200lbs.. Water line was above the filter this morning so I was happy to do waste for over 2 minutes and rinse for over 1 minute. It got it back to normal level only to have a down pour and added 3/4" back into the pool..
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    Texas Splash's Avatar
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    Re: Not happy with Sand Filter

    I would've bet there was a problem with one of those laterals. Well, watch it for the next day or so and let us know if the work you did resolved the blow-by issue. Maybe you took care of something without even realizing it. Or, perhaps it's the spider gasket? If not, continue with that sock trick at a return to see if you can pinpoint what that stuff is.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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    Re: Not happy with Sand Filter

    Well 3 days later my pool floor is still clean besides the normal stuff like bugs, frogs, and leaves. Seems allot clearer too.. Just got my DE powder today. Will add some using the link supplied above.. Thanks again
    17000 Gallons (16x32) Vinyl In Ground Pool
    Sand Filter
    Install "Finish Date" July 30 2014"
    Propane heater installed.. Used for 1 day.
    City Water.

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    Texas Splash's Avatar
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    Re: Not happy with Sand Filter

    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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