Woohoo. I have found and ordered some ascorbic acid here in New Zealand, should arrive in a day or two.
I was going through some other posts about iron stains and read about one person who had a washer cause rust marks in his pool. It got me to thinking about some metal hair clips that left rust marks on my pool and a couple of small nails my young son dropped in. Is it possible that these items could cause such an impact on a pool?
I think I have found a sequestrant here too. It is by an Australian company called BioGuard, the product is called Metal Magnet and is described as :
BioGuard® Pool Magnet™ is a chelating agent that
binds iron, copper and manganese in the water to
prevent them from being oxidised and staining the
pool surface or discolouring the water.
Product Features:
• Liquid chelating agent.
• Helps prevent staining from iron, copper and
manganese.
• Helps remove fresh stains.
• Eliminates water discolouration from oxidised
metals.
• When used according to label instructions, product
remains effective for up to 4 weeks.
They refer to it as a Chelating agent. Is that the same at a sequestrant? I can't tell if it uses phosphonic acid though. Does anyone know of this product?
Thanks again!