Our new hot tub will be delivered in a few weeks. We are installing it in the sunroom which overlooks the pool and yard. A new platform will be built to support the weight of the tub. Since the floor in the room is level, there won't be much for positive drainage to an "outside" location. My initial thoughts were to build the floor/platform a foot or so oversize and put a row of tile around the outside of the tub. I could use marine floor drains/scuppers with 1" line to drain away from directly underneath the sunroom (which is approx 18" above a sand base). Or, again use tile, but before my transition to carpet, put a small drainage strip in the whole length around, this would just essentially drip onto the sand below, but would also introduce an entry point for bugs/rodents freezing cold air up under the towel regions.