I swim in Charleston, SC area pools and I will be glad to furnish you with contact info to help secure a pool. I swim with a number of triathletes in my am swim pool. The area in general has many swimmers and triathalon want-to-be's at all skill levels and abilities. In other words, fertile ground for a TI seminar.
The pools that immediately come to mind are:
1) The Jones Center(Mt. Pleasant Recreation Dept.) 25 yd. Jeff Garrard, Aquatics Cooridinator. Phone:843.884.2528, email:firstname.lastname@example.org
2) City of Charleston Pools (Martin Park, 50 meters) and others 25 yds./meters. Aquatics Manager: Freddy Lentz. Phone: 843.795.5678, email: email@example.com
3) St. Andrews Family Fitness Center, 25 meters. Aquatics Supervisor: Lindsay Shuler. Phone: 843.763.3850, email: firstname.lastname@example.org
This info covers probably 90% of the pools in the area. There are some college/university pools but don't know availability of those. Let me know how it goes.