Welcome to the forum. I have a feeling you may have difficulty getting an answer. Never heard of a Club Soda Fizz before. This isn't really my area of the forum but I'll ask some questions and someone else will come along.

-- How sure are you about the pH being 7? Some kits don;t read below 7 so you could be very acidic.

-- Where did you get the fill water?

-- How did you get the readings? Test kit, strips, pool store?

-- Specifics on exactly what, how much, and when you added stuff to the pool.

With a pH that low if you aerate the TA will come down and pH will rise.

Al