When to use floc?

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pixiedustbelly

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May 28, 2015
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Troy, Ohio
Pool Size
21000
Surface
Vinyl
Hi friends!

I'm opening my pool and had to put in about a foot of well water with high iron. I want to make sure I'm doing things in the right order. Do I adjust the pH, then slam, then floc?

I just want to prevent the iron from staining the liner if at all possible. Thanks!
 
Hi Kelly. :wave: First off - no floc. It will not help and could actually complicate things. Since you are doing a post-winter SLAM Process, lower the pH to about 7.2 and start the SLAM Process. The elevated FC level is expected to aggravate iron. This is the time to filter it out. Place polyfill in the skimmer and/or run some pool water though a separate filter, but get as much out as you can to (hopefully) avoid the need to sequestrants later.
 
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Oh my goodness, you guys are amazing! I can't tell you how much easier you make my life and how many times you have saved my butt before I made mistake. 🤷‍♀️💗

My pH was low yesterday when I took my cover off and is now at 7.2 (no chemicals added yet). Does this seem fishy? Or should I just trust the numbers and move forward?

On my way to get polyfill! 👏🤞😍
 
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Add CYA and chlorine both. I would add 20ppm more of CYA first, let it dissolve, wait 2-3 days and test then. Meanwhile you can SLAM with your FC levels as if you had 30ppm of CYA in the pool. Adjust FC levels after you test CYA in a few days.
 
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The polyfill worked wonders! It's time to add more water to my pool, although not as much as the first time.

Does the polyfill need the shock level chlorine to catch the iron? Or will it work with regular levels of chlorine?
 
pixiedustbelly said:
Does the polyfill need the shock level chlorine to catch the iron? Or will it work with regular levels of chlorine?
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Each situation is different. Usually the iron needs to either be in enough solid form from the source to get filtered, or become aggravated with chlorine which can help with filtering. The downside of aggravating the iron is it might cause some staining. Kind of a dual-edged sword.
 
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