Thanks so much for your advice. I was able to "quickly" dry test both speeds on both pumps, the light, and blower. So I may just wait for the spa flush to arrive before I fill, leak test, and flush. I guess I'll find out if the heater works at that time.
On the salt question, this is a Craigslist find and not much is known about the spa. Apparently the brand is Superior Spas out of Okc, but they went out of business a few years back. So warranty is not on the table anyway. I was lucky enough to find out the molds were sold to Sunbelt, and my exact spa model is still being sold through Stellar Spas, so I can still buy replacement pillows and such. That being said, the spa pack/heater is a "Spa Builders M-Class" which seems to be a fairly high end pack. Do you think that equipment would have an issue with the salt content? I assume that the heater is the only concern since everything else is plastic and shouldn't really be affected by salt.
Oh one more thing, according to website that sells the same model I got, it's supposed to be 440 gallons. Is that usually pretty accurate or would I benefit from watching the meter to determine actual gallons?
This is the tub I got, $350 for the tub, $200 to haul it to the house, and $5 for the blown fuse that caused the previous owner to sell it (he thought he needed a new controller). Seems like a pretty good deal, just need new pillows and a new cover to be complete. http://www.stellarspas.com/sanjuan_detail.html