Iron stains.

Lmlarson

Member
May 7, 2019
15
Michigan
I know there are a million posts about iron staining - I’ve read them all! So we’ve been struggling with iron for the last few seasons. We’ve done partial drain and refills but we are on well water and don’t have much option other than using well water. We’ve done the ascorbic acid and run a polyfil filter. Here’s where we are at: last year, we were getting lots of iron caught in the polyfil. This season, our steps are staining after our fc level gets over 3, but we can’t get any more iron out it seems. Polyfil is still white after running for days. Our water doesn’t turn green, the iron is just present as a stain. Am I correct in thinking that the remaining iron is in a form that can’t be filtered out anymore? Do I need to drop my fc down, treat with ascorbic acid to lift the stains, then treat with a sequestrant to bind the iron - at which point the polyfil filter can catch it? Has anyone else had success with this?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,397
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
You may be in a fine line where the iron doesn't want to precipitate out of solution form unless the FC and/or pH are elevated. Doing that comes with the risk of staining, but that's my guess. If you're happy with the water, you could go the AA and sequestrant route. Now would be the time if your water is still cold to avoid algae which would just mess everything up.
 

Lmlarson

Member
May 7, 2019
15
Michigan
You may be in a fine line where the iron doesn't want to precipitate out of solution form unless the FC and/or pH are elevated. Doing that comes with the risk of staining, but that's my guess. If you're happy with the water, you could go the AA and sequestrant route. Now would be the time if your water is still cold to avoid algae which would just mess everything up.
Right. I can lift the stain with AA but the polyfil doesn’t seem to trap it at all and it just precipitates back as a stain vs discoloring our water. We are in the Upper Peninsula of Michigan so pretty much the coldest part of the states at this time of year😅. Our pool temp is sitting below 60 degrees still. If this process doesn’t work we are back to square one I guess.
 
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