I have them same issue with salt dropping. I have a 17k gal pebble tech bottom pool in southern California. I do have an auto filler and it trickles most of the day. However, our pool also has an attached jacuzzi which we use quite a bit. So with kids jumping in and out and steam from the jacuzzi the auto fill dribbles throughout the day.
Does evaporation/auto fill lower salt levels?
Thank you in advance,