Battling Iron Stains

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Hello! I just ordered 2 bottles of FerriTabs. I’ve been battling iron stains in my pool for 3 years so I’m really hoping they will help. I plan to do an ascorbic acid treatment before adding the FerriTabs. I have a 20,000 gallon pool and I’m a little confused about how many FerriTabs I should use. I read that one FerriTab treats about 3,000 gallons so I assume that means that I would need about 7 in my skimmer basket after the ascorbic acid treatment. However, I also read on your website where you said you usually add 1-3 at a time. Can you please clarify? I don’t want to use too little or too many. Attached is a photo of my pool. You can see the iron staining and also the blue-green water due to the iron.

Thanks!

Ask the Pool Guy Changed status to publish April 23, 2021

3 Answers

Hello! I did my ascorbic acid treatment yesterday and then added 3 FerriTabs in the evening. My sand filter pressure only went up 1 psi. Is it supposed to go up more than that? Do I still backwash after 24-48 hrs or wait until the pressure goes up more? Should I add more FerriTabs? Sorry for all the questions – I just want to make sure I get the iron out before it restains! 🙂

Ask the Pool Guy Changed status to publish April 23, 2021
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