DE filter in line after a cartridge filter.

skippr1249

Well-known member
Apr 25, 2008
48
San Carlos Mexico
I ask because we all know that or should know that cartridge filters go to 10 microns. With that flakes or minute particles are still visible especially under light. DE filters go down to 5 micron and the water appears polished.
If you were to take the 95% of the load off the DE filter with a cartridge filter which easier to clean, then DE filter which is more difficult to clean it will last considerably longer between cleanings.

So I have assume from the responses to date no one has ever tried it.

Thank you
 
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Jimrahbe

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TFP Expert
LifeTime Supporter
Jul 7, 2014
23,154
Bedford, TX
Skip,

I have three pools.. One of them has a large cartridge filter and the other two have DE filter.. All three have tiny "floaties" that can only be seen at night with the light on. I'm sure it is somewhat subjective, but I can't tell any difference in the water quality, or sheen, between all three pools.

I don't know of anyone that has tried your idea, but other that an increase in backpressure, I doubt that it would have any downsides.. I also doubt that you would see any real visual improvement in the water quality.

If I were going to to it, it would make sense to use the largest filters possible.

Thanks,

Jim R.
 
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Newdude

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TFP Guide
Jun 16, 2019
11,258
NY
I ask because we all know that or should know that cartridge filters go to 10 microns
You have a fair question. (y) I was just trying to understand the why because we get MANY folks thinking their filter needs work/help when it’s the water instead. Years and years worth of PBs / Pool stores convincing everybody that the pump/filter clears algae, not the chemistry.

And good on you for wanting to take it further, but you’d be hard pressed to see any results. :)
 

skippr1249

Well-known member
Apr 25, 2008
48
San Carlos Mexico
If mechanical filtration was equal to DE then I can see no reason for
DE's continued existence. You're right it is subjective. Kind of like acquiring a taste for fine wine. I have used both on various pools and can tell the difference, although I wish I couldn't. I suppose those that have never seen the comparison would would be satisfied not knowing the difference .
I agree in using as large a pump and filter as practical (budget permitting) in all cases. This allows the pool to recover from an event such as a dust storm etc rapidly.
 
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ajw22

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TFP Guide
Jul 21, 2013
29,152
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
If you want DE filter performance then replace your cartridge filter with a DE filter. There is no reason to gang them together serially.
 
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