This photo: https://www.louisianadigitallibrary.org/islandora/object/lsu-sea-pvc%3A639 probably doesn’t look like much to you. It shows a mostly empty swimming pool. What caught my eye, was that it was the Salt Water Natatorium out at Forsythe back in 1922. It shows very clearly how deep the pool was. They were having problems with harmful insects breeding in the water so it had to be drained to kill the larvae and eggs.