When doing the FC test my test card instructions says to multiply the number of drops by .05 which at 24 drops means my FC is 1.2. The Instructions in the sticky in this forum calls for multiplying by .5 which makes more sense, my FC is 12. Could confuse someone who is just using th eczrd and is unfamiliar with what the range of results for their pool is. With my high CYA And a FC of 1.2 I would be adding gallons of bleach!