This is my 4th season on this method and it has been a breeze. I have been putting the pencil to it though and I have already spent $100 in bleach in about 4 weeks. My uncle owns a Piggly Wiggly and I get cases of 4 for 10.00. It is Simply Done 8.25%. My CYA is 30 and I have a 24k gallon inground. What is your average weekly or season cost?