Things have been slow around the homestead today so I thought I would do some figuring about how much chlorine I have used to date. My numbers run from March 2019 until today. For the year, I have used 67 gallons of chlorine. The "pool season" dictated the most use at 58 gallons (Mar '19 through Oct '19). All in all, I was pretty surprised at the relative small amount I used (I think?) considering we leave the pool open year round and it gets pretty darn warm in the summer. Price wise, chlorine cost me less than $200 for the entire year. Thanks to the good advice here, no SLAM was required.