We purchased a house with a 28ft AG beaded liner that was severely neglected for many years. Due to some horrible planning on the original owners part the sand underneath has ruts washed in it. We are going to replace the existing beaded liner with a 30Mil overlap liner, as well as place 3/4 pink foam board underneath with the foam cove. We are going to triple tape with Gorilla Tape. It shouldn't need much work to the sand base. I already have the pool drained and will be removing the old liner this morning. We did do a foam base in my parents 15x30 AG but that was YEARS ago. I will be updating with pictures as this goes along. Hoping for some good warm weather over the next few days.