Cloudy water, filter PSI, too frequently backwashing

Causes and cures for cloudy swimming pool water.
Milky pool water, white, pink, brown, purple, black cloudy water.
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Cloudy water, filter PSI, too frequently backwashing

Postby MSWETWILLIE » Sat 26 Apr, 2008 15:08

Okay here are the facts:

* Owned inground pool 36.5 X 17.5 7ft Deep 4 Ft shallow end, for 15 years
* New liner in early 2007. no problems all summer.
* Left cover off pool all winter. It was a mild one. I live in Southern VA.
* Didn't even clean DE filter - left it all winter
* This year in early April, poored slab lifting filter and pump 3 inches.
* reworked pluming, all seems tight.
* Added shock and algeside in Mid April and started filter
* Filter went form 10 PSI to 20 PSI in exaclt one hour. 10 PSI means BW!
* BackWashed filter no problem. Added 6 LBS of DE. Exactly 1 HR later 20PSI
* Now - 100 LBS of DE later filter goes from 10PSI to 20PSI in exactly 1 Hour.
* Put in 6 LBS Aluminum Sulfate. Water turns extremely cloudy!
* Everything is suppose to drop to the bottom but never does
* Relplaced 3 ripped filter grids.
* Filter runs at 10 PSI for one hour than hits 20PSI - time to Backwash.
* tried not backwashing. Let pump sit idle for 15 Minutes.
* start pump again and it sits at 10PSI for one hour. Then shoots to 20 PSI
* tuned it off again. Restarted after 10 minutes, starts out at 10PSI - runs for an hour before hitting 20 PSI.
* all this and no improvement in water. Flow looks good when pump is running. No leaks. A little bit of air getting in from somewhere. I suspect I need a pump basket lid gasket..... H E L P!!!!

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Postby mr_clean » Sat 26 Apr, 2008 16:38

when replacing bad grids, how did filter look on the inside? full of DE buildup? I assume when changing your grids you cleaned all the grids & the inside of your filter?
was your pool green full of algae? or is it just cloudy?

normally a cleaned filter only goes up fast if the pool looks like a green swamp filled with algae or the plumbing is incorrect & the grids do not have DE on the outside of them but on the inside.

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