Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 27

Thread: How can you tell if your sand filter is low on sand?

  1. Back To Top    #1

    How can you tell if your sand filter is low on sand?

    Hello everyone,

    I opened my sand filter up for the first time after four years of having it, to do a deep clean. The sand looked very clean to begin with and rinsing didn't really wash up anything either so I guess we are ok.
    However, the level of sand is what I would describe as a little less than half full. Is that normal? I never looked into one before so I have no idea what it should look like and was wondering if we lost sand over the years?
    If so, can I buy a bag and just top it off?

    Thank you
    And a sparkling pool season to all
    27000 gallon
    inground
    vinyl
    sand filter Hayward Pro Series S244T
    pump Hayward 1.5 HP SER. 2011CH
    gas heater Hayward H 350 FBN



  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How can you tell if your sand filter is low on sand?

    Some sand filters have a fill line inside showing where the sand should come up to. Typically the filter is just a little less than half full of sand, there needs to be room on top for water circulation.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Re: How can you tell if your sand filter is low on sand?

    Wow,
    I swear this is the friendliest forum ever. I am never embarrassed to ask questions, and the people on here always know the answer.
    Thank you so much for the quick reply
    27000 gallon
    inground
    vinyl
    sand filter Hayward Pro Series S244T
    pump Hayward 1.5 HP SER. 2011CH
    gas heater Hayward H 350 FBN



  4. Back To Top    #4
    Propbndr's Avatar
    Join Date
    Mar 2015
    Location
    Charles City, Va
    Posts
    232

    Re: How can you tell if your sand filter is low on sand?

    Here is a quote from page 3 in the manual for your filter:

    Sand surface should be leveled and should come to within 6" of the top of the filter tank.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

  5. Back To Top    #5

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: How can you tell if your sand filter is low on sand?

    It sounds like you are good.
    If you what to add some you should make sure you get #20 sand or silica sand. Pool store, hardware, big box ...
    Attached Images Attached Images
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: How can you tell if your sand filter is low on sand?

    Quote Originally Posted by JasonLion View Post
    Some sand filters have a fill line inside showing where the sand should come up to. Typically the filter is just a little less than half full of sand, there needs to be room on top for water circulation.
    Quote Originally Posted by Propbndr View Post
    Here is a quote from page 3 in the manual for your filter:
    Hmm. These seem to be a bit contradictory.
    I would have though you want the sand up at the top of the largest diameter of the filter ... but I have no experience
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  7. Back To Top    #7

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: How can you tell if your sand filter is low on sand?

    I have always assumed most sand filters do best a little over half full......even around 2/3 full. They certainly need "freeboard" (room at the top) but the more sand the water has to pass through, the better the filtration.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  8. Back To Top    #8

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: How can you tell if your sand filter is low on sand?

    On Hayward's site the manual says that specific model takes 300lbs #20 silica sand to fill it up. http://www.hayward-pool.com/pdf/manu...220T-S244T.pdf

    I didn't see anything about 6" from the top in that manual. Like mine I think with 300lbs you're going to be somewhere around half full.

    They do recommend filling it 1/2 full with water before adding the sand to cushion the laterals from the shock of the falling sand.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  9. Back To Top    #9
    Propbndr's Avatar
    Join Date
    Mar 2015
    Location
    Charles City, Va
    Posts
    232

    Re: How can you tell if your sand filter is low on sand?

    Quote Originally Posted by Kiss4aFrog View Post
    On Hayward's site the manual says that specific model takes 300lbs #20 silica sand to fill it up. http://www.hayward-pool.com/pdf/manu...220T-S244T.pdf

    I didn't see anything about 6" from the top in that manual. Like mine I think with 300lbs you're going to be somewhere around half full.

    They do recommend filling it 1/2 full with water before adding the sand to cushion the laterals from the shock of the falling sand.
    Using the link provided, the 6" measurement is found in the Installation section on page 3, step 3 "Loading sand media" sub step D.

    In my Triton 2, the "free board" between the top of the sand and filter housing is 10.5". My operating manual stresses the importance of this measurement. From my manual:

    NOTE: The free board distance is the most important variable and should be maintained. Sand density will vary and therefore sand amount is given as a reference.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

  10. Back To Top    #10

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: How can you tell if your sand filter is low on sand?

    You are absolutely correct, it does.

    d. Carefully pour in correct amount and grade of filter
    sand, as specified on Table 1. (Be sure center pipe
    remains centered in opening). Sand surface should be
    leveled and should come to within 6" of the top of the
    filter tank. Remove sand shield from internal pipe.

    And Table 1 for that filter says 300lbs. That just seems awfully full but it's what the manual tells you to do.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  11. Back To Top    #11
    Propbndr's Avatar
    Join Date
    Mar 2015
    Location
    Charles City, Va
    Posts
    232

    Re: How can you tell if your sand filter is low on sand?

    Quote Originally Posted by Kiss4aFrog View Post
    Table 1 for that filter says 300lbs. That just seems awfully full but it's what the manual tells you to do.
    I agree, it does seem awfully full. The free board level on my filter is so large because the defuser and inlet piping assembly actually is designed to pivot which, allows for almost full access to the top of the sand bed and to not have to cover the defuser when replacing the sand. This is a great feature!

    Her filter does not have the pivot feature so, it does not require a huge free board space. Perhaps, at 6" free board, the design of her filter's body allows for full diameter surface area exposure.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

  12. Back To Top    #12

    Re: How can you tell if your sand filter is low on sand?

    Ok, so after reading the manual (by the way, great idea guys) one would assume 300 pounds of sand would bring it up to about 6 inches from the top.
    If that is true, where did all the sand go? I never really had to backwash too much, like I said the sand looks really clean. The laterals seem fine since there is never any sand backwashing into my pool. I am not taking the sand out just to weigh it, ( even so am tempted) but if I had to take a guess , it would be a loss of at least 75 pounds or so. I grew up metric so this is a so so estimate. But like I said, the filter is less than half full. Can they loose that much sand under normal conditions in about 5 years?
    Maybe the pool builder never put in 300 pounds of sand to begin with? But at the same time looking at the size of that filter it looks like it would take more than 300 pounds of sand to bring it within 6 inches of the top. Somehow these two numbers don't really add up?
    So I will do what my german heart of precision and regulations tells me not to: I will "kinda guess" and put "some" sand in until it "looks about right".
    After that, I will sit by my pool and have a beer, because some stereotypes are not stereotypes at all
    27000 gallon
    inground
    vinyl
    sand filter Hayward Pro Series S244T
    pump Hayward 1.5 HP SER. 2011CH
    gas heater Hayward H 350 FBN



  13. Back To Top    #13
    Propbndr's Avatar
    Join Date
    Mar 2015
    Location
    Charles City, Va
    Posts
    232

    Re: How can you tell if your sand filter is low on sand?

    When I changed my sand, 2 weeks ago, the sand level was down to about half the body level also. So I know your confusion. The only thing I can think of is when backwashing the sand partials grate against each other turning some of it to dust which gets flushed out during backwash. That would explain why no sand gets sent back to the pool and why the level will decrease.
    Steve
    32 X 16 inground, 17260 gallons, Vinyl Liner, Triton II TR-60 filter,
    Sta-Rite 1hp pump Model #MPRA6E-147L, CircuPool SI-30 Plus SWG, TF-100 Test Kit

  14. Back To Top    #14

    TFP Guide

    Kiss4aFrog's Avatar
    Join Date
    May 2013
    Location
    Hudson, WI
    Posts
    2,602

    Re: How can you tell if your sand filter is low on sand?

    I guess you'd be safe anywhere from half full to within 6" of the top. Good chance that like a lot of "us" the installer didn't read the manual either and went off what he's been doing in the past. That or he tried to save a couple bucks for his beer that evening

    My filter, I'd go by the manual and add some sand to get it closer to that 6". The more sand, the better it should filter.
    '70s IG Vinyl 32K gal, Lazy L, Hayward SuperPump 1.5hp 120V, S240 Sand Filter W/DE
    Solar Blanket, Well Water, Borax Added, TF-100 tester. ? too cold
    1979, 275gal Conway Emerald Spa P-100-2, ES-2 Spa Pack, bromine floater, indoor
    TF-100, Best test kit - TFTestkits.net
    Please help keep the lights on, become a TFP Supporter!

  15. Back To Top    #15
    DaneCE's Avatar
    Join Date
    Jul 2011
    Location
    VA
    Posts
    241

    Re: How can you tell if your sand filter is low on sand?

    About 3 years ago I added more sand to my filter following the exact directions but after backwashing a few times it spit out what it didn't want. Now I just leave it where it naturally wants to be which is around 3/4 full.

  16. Back To Top    #16
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: How can you tell if your sand filter is low on sand?

    Quote Originally Posted by Propbndr View Post
    When I changed my sand, 2 weeks ago, the sand level was down to about half the body level also. So I know your confusion. The only thing I can think of is when backwashing the sand partials grate against each other turning some of it to dust which gets flushed out during backwash. That would explain why no sand gets sent back to the pool and why the level will decrease.
    No way you are turning sand to dust. More likely some is lost when backwashing.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  17. Back To Top    #17

    Join Date
    May 2015
    Location
    Fort Mill, SC
    Posts
    179

    Re: How can you tell if your sand filter is low on sand?

    Hello all, I just ran into this puzzle while replacing the laterals and filter sand. I've got a 10-year-old Hayward S220T, and the "required amount" of filter sand is stated at 250 lbs on the front plate. I loaded exactly 250 lbs of fresh filter sand, and it was well short of the 6" from the top stated in the manual (I'd say it was over 12" from the top). Given this dilemma, I loaded some of the old sand on top and got it closer to 7" or 8". Even that required a significant amount of additional sand, 100 - 150 lbs I'd say. Now I'm wondering if I made a good call on that. The old sand filled about half the tank and ran 12 PSI when clean. With the mix of old and new sand filled up higher, the PSI only increased to 13 PSI or so. I've had it running for 24 hours and the water clarity looks good. The jets seems to have the same water pressure as before. The backwash cycle also works perfectly. So it seems to be running well, but I'd like to have a better understanding of this. I opened a case with Hayward as well. I'm hoping the 250 lbs is just a minimum, and you can load the additional amount for better filtration if desired. I'm not super-excited about going and vacuuming 100 lbs of sand back out...

  18. Back To Top    #18

    Join Date
    May 2015
    Location
    Fort Mill, SC
    Posts
    179

    Re: How can you tell if your sand filter is low on sand?

    This one's kind of bugging me, any comments?

  19. Back To Top    #19

    Join Date
    May 2015
    Location
    kingston springs, tn
    Posts
    101

    Re: How can you tell if your sand filter is low on sand?

    I just changed my sand, laterals, and lateral hub yesterday evening in a Triton II TR60. I had been getting a little sand in my pool since we installed a new liner. Actually changed the sand a few weeks earlier this year and figured I had overlooked a bad lateral. This time I replaced all 8 laterals and hub. The ones I removed looked fine, "go figure". I followed the recomended 50 lbs pea gravel and 275 pounds of sand. The pea gravel took up a little more space than if I had used 100% sand. Sand level was right below the inlet pipe with the diffuser. Freeboard space is the beveled space at the top of the filter. Seems to work just fine but too early to tell about the sand residue in our pool. If it returns the only thing I can think of is there must be some smaller diameter sand residue from the liner change that gets recirculated though the filter and sent back into the pool over and over again. Has anyone had this problem before? If it comes back I guess the next step is to vacuum the sand out the waste port of the filter.
    18x36 IG vinyl 18,000 gal, Hayward super pump 1hp - 1.5" pipe, Pentair Triton TR-60 sand, Pentair Itellichlor IC-40 SWG, Pentair Intellibrite 5G 12v color LED light, Polaris 280 cleaner, Hayward Booster pump, Intermatic Power / Timers.

  20. Back To Top    #20

    Join Date
    Mar 2015
    Location
    Louisville, KY
    Posts
    32

    Re: How can you tell if your sand filter is low on sand?

    Quote Originally Posted by pondfishr View Post
    I just changed my sand, laterals, and lateral hub yesterday evening in a Triton II TR60. I had been getting a little sand in my pool since we installed a new liner. Actually changed the sand a few weeks earlier this year and figured I had overlooked a bad lateral. This time I replaced all 8 laterals and hub. The ones I removed looked fine, "go figure". I followed the recomended 50 lbs pea gravel and 275 pounds of sand. The pea gravel took up a little more space than if I had used 100% sand. Sand level was right below the inlet pipe with the diffuser. Freeboard space is the beveled space at the top of the filter. Seems to work just fine but too early to tell about the sand residue in our pool. If it returns the only thing I can think of is there must be some smaller diameter sand residue from the liner change that gets recirculated though the filter and sent back into the pool over and over again. Has anyone had this problem before? If it comes back I guess the next step is to vacuum the sand out the waste port of the filter.
    I replaced the laterals and the standpipe assembly about a month ago. It did not fix my issue of sand blowing into my pool. I've tried to learn to live with it, but it is pretty annoying. I tried putting socks on my returns to catch the sand but it seems to get through them as well. Although it did turn my socks a sandy color. I suppose my next steps would be to replace the diverter in the multiport valve. I checked the spider gasket and it looked fine. Tomorrow I plan to check the freeboard space to make sure it is correct. Beyond that I'm stuck on what else it could be besides taking out the sand to check the laterals again. Although they looked fine the first time I did this and I went ahead with the replacement anyways...
    18x36 Fox X-Brace 28,000 gallons Inground Pool, Pentair Sand Filter model TA60D, Whisperflo WF-24 pump, PoolFrog 5400

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •