Penny, I am in Mandeville, La so I am familiar with the issue. We just added 40 pounds of salt last week because of all the rain we had a couple of weeks ago. We dropped from 3300 to 2800 in a week. We have had to add salt twice in the last year due to heavy rain. I would wait until a couple of days after the rain has subsided and make sure the salinity reading from your SWCG has stabilized and does not change. You will need to turn off your SWCG for 24 hours after adding salt and run your pump the whole time. We have a drain near the top of our pool that automatically drains it so it does not overflow. We must have had 12-14 inches of rain in a 7 day period. It was hard for the drain to keep up. Good luck.