AA treatment - When to call it quits...

[Davey_crocket]

Doing an 'opportunity' based AA treatment. By that I mean the pool pump was left off by accident, fc dropped to zero and I was lucky enough to catch it before algae.

My stains appear to be iron from vitamin c tablet test.

But here's the thing. My pool is only 20K litres, and I've dosed 750g of AA over the last 24 hours, but these things are bloody holding on!

At what point do you stop adding AA and live with the stains?

 

[ajw22]

AA lifts stains quickly if they are iron stains.

24 hours is more then enough time.

 

[Davey_crocket]

Beginning to think that some of my stains (the ones I tested with vit c) were iron, maybe these ones aren't.

Possibly could be copper, I've never added any to the pool but the previous owner did leave behind a half used bottle of the cheapest algaecide he could find...