Secondary filter for iron

msumoose

In The Industry
Apr 19, 2012
152
#1
I have a pool I am trying to clear, but it has high iron. Every time I add chlorine, it turns brown. Read on another forum a method of taking a submersible pump and routing the output through poly batting after shocking to filter out oxidized iron. Is this feasible?
 

duraleigh

Admin
Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
31,271
Sebring, Florida
#2
It all depends on the amount of iron you have. If your fill water is heavy with iron, it will just keep coming back.

Test your fill water and post back with that result.

Generally, a mechanical filter does not work well with iron but there is always a chance.
 

pooldv

Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
Aug 10, 2012
24,976
DFW, TX
#3
You can stuff some polyfill in your skimmer baskets and see what happens. It definitely won't make it worse! :)
 

msumoose

In The Industry
Apr 19, 2012
152
#4
The polyfill was the idea, using another pump. At this point the homeowner is chomping at the bit to swim. It is BAD. I know it is the fill water - did a liner up the road (same water association) and had to use a sequestrant in the first 1000 gallons. This pool is fiberglass and has not been emptied in 12 years, filling from the same high iron fill water.

I will have test results tomorrow.
 

CJadamec

TFP Expert
Apr 29, 2016
2,192
Quaker Hill, CT
#5
A greensand filter might be able to remove some or all of the iron in the fill water for the pool. A reverse osmosis filtering of the pool would work too. Both are on the expensive side of things tho. Iron is one of the most difficult things to remove from water.
 

YippeeSkippy

Mod Squad
LifeTime Supporter
Jan 17, 2012
8,995
Evans, Georgia
#7
I've always been tickled by the low-tech use of polyfil and/or plain old paper towels in the skimmer to help collect iron. Low budget and it doesn't add anything to the water. It might not work entirely but it might be worth a try if just to lower it some, right?
 

Swampwoman

TFP Expert
LifeTime Supporter
Apr 27, 2012
3,844
Grand Rapids, MI
#8
When its oxidized, just about anything can catch some iron.
But generally in water tech world, filtration below 5 microns removes more.
Slimebag is 1 mcron, ergo, would capture more.
 

msumoose

In The Industry
Apr 19, 2012
152
#9
So just did a test (regular not metals)
Free Cl 2.0
CC < .5
TA 150
pH 7.4
CH 75
CYA 80

Iron and copper test arriving via FedEx tomorrow.

Made a filter. It is working pretty good. Catching some stuff, but I am sure it is not enough.

I have 5 lbs of citric acid for the brown pool walls, but not being able to SLAM is frustrating.