We recently made a day trip to Northern Utah that included Hill Aerospace Museum, the Bear River Migratory Bird Refuge, and Crystal Hot Springs in Honeyville, UT. I remember going to Crystal Hot Springs as a child, but it had been a long time.
It was a cold, cloudy April day, so it was perfect for swimming/soaking in hot water. The natural hot spring that feeds the pool is about 120-134 degrees Fahrenheit and contains 46,000 mg/L of minerals. The mineral water makes you buoyant, and has a very salty taste. I didn't realize how much razor burn I had until I dipped in the pool. According to their website, 8,400 gallons of water surfaces from the spring every 5 minutes, from 8,000 feet below the earth's surface. In 24 hours there are 2.4 million gallons of hot water. Because of this constant flow of water, the pools do not require chlorination or other chemicals to clean the water. The water flows from the pools to a pond on the far side of the park, and eventually to the Bear River. According to their website, the three hot tubs and soaker pool are drained, sprayed out and cleaned every night. They also make a big deal of the magical healing properties of the mineral water, which I don't really buy into.
There are three small waterfalls in the big pool. One of them is scalding hot water, another is freezing cold water, and the middle one is somewhere in between. Our boys loved standing in the freezing cold waterfall and then jumping into the hot pool. I don't think the other guests loved the splashing, but no one said anything! There were also some water slides on the far side of the resort, but we didn't try those out this time.