I just got my SmartThings on Friday and took it over to my parents house to test it with the exact device linked to above (the Intermatic PE653RC MultiWave Z-Wave Wireless Pool/Spa Control System).
The SmartThings was able to control the intermatic device but it thought it was a simple ZWave switch. It was able to turn the pool filter on and off but that was it. There was no interface that allowed for setting up a program for the pool filter or set the temperature of the spa or pool.
The remote that came with their system allow them to set multiple schedules for turning on and off the pool filter, switch their system for pool over to spa and to set the temperature for both the pool and spa.
I’d be glad to provide any more information, especially if it would help get an interface setup to fully control the device.