Set the temperature of your tub to whatever is most comfortable to you. Our experts generally recommend anything between 98ºF and 102ºF (36ºC and 38ºC). Let the water circulate a bit more and then place the cover on your hot tub. You'll want to keep the cover on for at least 24-hours before use. Hot Tub Volume: 2000L. Initial Dosage: 200ml. Routine Dosage: 60ml. How do I routinely use CleverSpa Universal Hot Tub Descaler in my hot tub? 1. Add the required amount to a small amount of water in a separate container, then directly to your spa water with the circulation pump switched on. 2. Ensure that the pH of your spa water is maintained. This hot tub’s filtration system includes a circulation pump and two diverter valves, plus UV-C technology to eliminate 99.9 percent of waterborne pathogens without chemicals. Its dimensions are.