This summer I switched to liquid chlorine - I pour the 1 gallon 5% concentrate from the dollar store once weekly, 3 gallons if shocking is needed. I have liked the less vacuuming, etc. I want to try Minyards stores, has a deal for 1 gallon 12.5% strength for $2.99. Pool is 15k gallons, used about once/twice fortnightly by 2 people, location is Texas. I am wondering what is the general rule of thumb for the amount to pour for both 12.5% and 5% concentrations, how often and what summer, winter variations if any?