I'm one week into BBB and my chlorine usage has been very light. My FC has only been dropping .5 ppm per day. Is this normal? The water is still 64 degrees and it hasn't been used as of yet. My CYA is around 65-70 so i am trying to keep my FC at approx 7-8 ppm. I added 1 qt of 12% on Friday which brought it up to 9 ppm FC and have needed no additions since then. On a side note, there are 2 pool companies near here that recommend FC of 1-3ppm. Why does that seem to be the consensus of pool companies? Just curious.