ABATTBQ11 said:
Problem I have is that the playground is going to be wood and in the yard, so kind of hard to barrier treat when they're already in the barrier.
It won't matter. Put a barrier around the structure or each place it touches the ground. The termites don't live in the wood. They have to travel back through the treatment to their Colony. Termidor or the generic Taurus is passed between termites. It's transferable and takes advantage of their social behavior, so you don't need every single one to get it from the structure, even a few will still be effective.
If that's not good enough for you then you can double down and you want to go with BoraCare and treat the structure itself. Not a bad option anyway because it preserves the wood by handling fungus and mold as well. It's good stuff. I've used this on 100 year old barns with active infestations and they are dead after one treatment. It soaks into the wood with a carrier and will remain active.