Now that we are swimming, I was wondering what the normal FC loss would be after adding liquid chlorine in the evening and closing the auto cover? I added chlorine to 6.5 ppm two nights ago and then closed the pool. It rained all day yesterday, so I kept it covered and didn’t test any chemicals. This morning I tested and FC was at 4.5 ppm. Is that normal for two days? Also, pool is completely clear. Thanks in advance!