I think you're missing the point. Your history goes back to the 9th (5 Days) is that as long as you've been using pucks/dichlor shock? Or has it been for as long as you've had the pool? If it's the latter, about how many pucks/lbs of shock have you used in all that time? Lacking any test results, it makes it virtually impossible to determine how much cya is already there. When I was using pucks and shock, it was approximately 2lbs of dichlor weekly, and 2 tabs of trichlor every 5 to 7 days for almost 1.5 years not including winters.