Will drain 1/2 pool tomorrow. still confused though---to many numbers running through my head. Say my cya is 90 by the bleach calc, in order to shock I need to add almost 11 gallons? Is this correct? If so I think I might be getting it DUH!!!!

How do I order one of those test kits. Do they have them at pool stores?

Again thanks for your patience and help
Karen