Chemgeek,
Thank you for the quick reply.
I think I am going a litlle "Cuckoo" as we say in the UK, I actually added Universal Chemical's Stain Treatment which I believe is 100% Oxalic Acid not Yellow Treat. This does seem to be helping along with the chlorine and borates.
If you move to Hawaii then you can do your pool chemical testing year round!
Aloha
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