Raising/Maintaining Chlorine After Iron Stain Treatment


New member
Jun 25, 2021
Hi all,

This is my first season as a pool owner, and been having trouble with iron stains. I have a 15,000 gal pool, vinyl liner, sand filter. I finally removed the stains, using absorbic acid and some Vitamin C tabs. I also used a filter aid, a CUlator pack and a chelating agent to hopefully remove the iron at the filter level. And I'll be using a sequestrant to hopefully keep the metals in the water.

The stains first showed up when I shocked the pool. And most of these stain removal products say to shock the pool as little as possible.

So I'm wondering, how should I go about raising chlorine without re-staining the liner? In addition, what should I do about shocking the pool? How often?

Just wondering if anyone has experience with preventing metal stains long term.

Thanks in advance

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
Texas, San Antonio/Marion, South-Central Area
Pool Size
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Welcome to TFP! :wave: There should be no reason to arbitrarily "shock" a pool to increase the FC level. Here at TFP we only increase the FC to elevated levels if algae is confirmed. So if you have crystal clear water and see no algae or haziness, then maintaining the FC according to your current CYA level as noted on the FC/CYA Chart is all that is needed.

On this forum we advocate the use of either a TF-100 or Taylor K-2006C test kit. That's an essential part of having accurate chemistry. More on the link below.



LifeTime Supporter
Aug 19, 2014
Pacific NW
I did an aa on opening day, same pool volume.
What I did was just add enough chlorine to keep it minimal for the week of keeping it low.

It was incredible. I had forgotten how blue my liner was. I didn't continue to add sequestrant so the staining came back w a vengeance. I've decided to filter it out with s whole home 2 stage iron filter next year. I decided sequestrant would be a waste of money and instead will nip it in the bud by filtering it out.
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