Diatomaceous Earth versus Sand filter

[packerfan]

i've come to the conclusion, now that i'm on my 3rd sand filter , that there is no way of not getting sand back into the pool. i've been through it all with a sta-rite,jacuzzi, and now hayward sand filter,and seems no matter what i do, i get sand of some type in my pool after running the filter over night. i now have the Zeobrite stuff in my new filter and have the same problem. any ideas? the reason i changed filters is i totally rebuilt them ,laterals,standpipe ,etc. and still had the problem . this is one reason maybe someday i'll go to the DE type.

[waterbear]

i've come to the conclusion, now that i'm on my 3rd sand filter , that there is no way of not getting sand back into the pool. i've been through it all with a sta-rite,jacuzzi, and now hayward sand filter,and seems no matter what i do, i get sand of some type in my pool after running the filter over night. i now have the Zeobrite stuff in my new filter and have the same problem. any ideas? the reason i changed filters is i totally rebuilt them ,laterals,standpipe ,etc. and still had the problem . this is one reason maybe someday i'll go to the DE type.

With your luck you might end up with DE in the pool! Maybe you should consider a cartridge filter

[CarlD]

i've come to the conclusion, now that i'm on my 3rd sand filter , that there is no way of not getting sand back into the pool. i've been through it all with a sta-rite,jacuzzi, and now hayward sand filter,and seems no matter what i do, i get sand of some type in my pool after running the filter over night. i now have the Zeobrite stuff in my new filter and have the same problem. any ideas? the reason i changed filters is i totally rebuilt them ,laterals,standpipe ,etc. and still had the problem . this is one reason maybe someday i'll go to the DE type.

OK, I've NEVER had this problem in 4 years, and I don't think Poconos has had it in 9 years. I can think of only 2 things going on:

1) It's not sand but something finer that's too fine for your sand to filter. I don't know where you live, but maybe you have some very fine dust there that's less than 60 microns. Actually, I think my NEXT cause is more likely.

2) What I REALLY think is happening is that your pump is too big for your filter. If your pump's GPM rating is higher than your filter's then it will force sand back into the pool. I was VERY careful to get a filter with a bigger capac than my pump, and I mostly run it at low speed (I have a 2 speed). I was AMAZED to find it actually filters better at low speed--seems the water at a lower velocity can allow the sand to filter more.

Why don't you post your pump size and model and your filter size and model? I'm betting you have a monster pump and it's overwhelming every filter you've had.

[packerfan]

ok , first off the original filter was 24in starite, 2nd filter 22.5 jacuzzi, now i have a 24 in hayward, all while using a 1hp pump.it looks like the sand that's in there is not the zeobrite i put into the sand filter. i was wondering if maybe adding some de to this filter might help. i've already tried some filter aids through the skimmer and only backwash when the pressure gets over 10lbs over normal. i've had this pool for 15 yrs now and this problem never seems to go away :-( i know these filters inside and out and have heard every excuse and story about the sand from the manufacturers and pool places. i never thought that i would have to vacuum every time after running the filter overnight but it's a must now.

[CarlD]

Well, the DE fix is super-cheap so you might as well try it--throw out eight or 10 bucks on 10# of DE. Add enough to raise pressure 1 #, starting with about 1/3 of a cup. 10# will easily last one summer, if not 2.

[dalparadise]

Backwashing a DE filter is a snap -- I do mine about once per month during swim season and maybe once in the winter, since I never close my Texas pool. It probably takes 30 minutes to backwash and recharge the system. There is no gunk to touch -- no problem.

Now, once per year, in late September, I break the filter down and thoroughly clean it. It is a nasty mess and a real pain. Last fall, it took me over an hour to finish cleaning, reassembling and recharging.

I don't know much about sand, but I know DE filters are incredibly good at filtration. In fact, I think it's the same basic principle most water treatment systems use. With a little effort, a DE system will provide water that is cleaner than the stuff coming out of your tap. I love mine.

[ThePoolGuy]

Backwashing a DE filter is a snap -- I do mine about once per month during swim season and maybe once in the winter, since I never close my Texas pool. It probably takes 30 minutes to backwash and recharge the system. There is no gunk to touch -- no problem.

Now, once per year, in late September, I break the filter down and thoroughly clean it. It is a nasty mess and a real pain. Last fall, it took me over an hour to finish cleaning, reassembling and recharging.

I don't know much about sand, but I know DE filters are incredibly good at filtration. In fact, I think it's the same basic principle most water treatment systems use. With a little effort, a DE system will provide water that is cleaner than the stuff coming out of your tap. I love mine.

What part of Texas you live in?


Anyhow, I look at a DE filter as something that polishes the water It just puts a nice shine on a pool in my opinion. It's probaly not that much more time consuming to clean one over a sand filter either. Sure you got 7 pannals to clean on a DE filter thats usualy a mess..but you also have to scoop sand out of a sand filter. You also don't have to BW them as frequently as a sand filter. I usualy do mine the same about once a month. This has to save on water and make up for the extra cost on buying the DE. There is some people who simply just bump the DE filter a little ( BW for a seconds) and only has to add a 1/2 lb of DE instead of doing the whole BW process.

On a side note, one can also add a scoop of DE to a sand filter to help out the sand a little. FYI: I'm pretty sure you can't do this to a cartridge filter..it would probaly rip it up or clog it up one.

[waterbear]

On a side note, one can also add a scoop of DE to a sand filter to help out the sand a little. FYI: I'm pretty sure you can't do this to a cartridge filter..it would probaly rip it up or clog it up one.

Not necessary with a cartridge. Sand only filters to 60 microns, a CArtridge will filter to 20...almost as good as a DE filtering to 6. And a cartridge filters better when it is dirty! (but don't let it get TOO dirty or it is a pain to clean)

[debs_pool]

Well, the DE fix is super-cheap so you might as well try it--throw out eight or 10 bucks on 10# of DE. Add enough to raise pressure 1 #, starting with about 1/3 of a cup. 10# will easily last one summer, if not 2.

CarlD,

HOW do you do this? (I'm not ready yet (or even no if I should do this) - still working on that algae problem!) Is this something I might want to do? Or do I just want to keep sand? If I have to have "maintenance" it's usually expensive -- because I have to call the pool place. WHERE do you add this DE? And it's okay to mix sand & DE? If this is addressed somewhere else, I apologize for not continuing my search of threads.
And I can't thank you enough for all your help -- but thanks for all your help.

[MaryLee]

WHERE do you add this DE? And it's okay to mix sand & DE?

I'm not CarlD and I may be wrong, but I think you just add a scoop of DE to the skimmer. This will suck it into the filter where it will stay and help with filtration...the same as a DE filter. Hopefully someone else will chime in here.