Well,the past 2 yrs. I can keep water balance perfect.But,just has soon has I have people in pool water turn's cloudy.I thought maybe it was my sand.Well,that's been changed.Still cloud's up.Had 7 kid's in pool today.Water level's were last night.FC=5 CC=0 ALK=60"add'd 4 pounds of soda last night"CYA=20"add'd what I had left in jug last"Had my CYA up to 40.But, has been dropping off.We have had alot of rain.Having to backwash alot.Figure that's where that's going.