Still not clear on sequestering agent

I noticed some overall staining on walls and floor of my plaster. I rubbed a vitamin C tablet and it cleared right up. I think its Iron coming from the 3 cheap umbrella poles that sat in the tanning ledge for the past year. So my plan is to do an Acorbic Acid treatment. But I'm still confused on the sequestering agent part. Jack's Blue stuff seems fine to me unless there's a cheaper alternative. They're website says "initial dosage: 1qt per 10,000 gallons, then 6-8oz per week for maintenance. Since this isn't coming from well water or algaecide or anything, do I need to add the 6-8 oz a week after the initial dosage? Also Amazon sells some other metal out products but I can't tell if they are sequestering agents or just stain removers. Any help would be appreciated. Thanks!
 


We can't say for sure what will happen if you don’t maintain your sequestrant level. In time the sequestrant breaks down and will release the metals and they can redeposit somewhere on your pool. The only way to remove the metals is to drain the water that has the sequestrant and metals.
 
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