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If the water has been in the hot tub for a while, it may be that the tub feels rough. There is a layer on the tub where it is in contact with the water.
When the hot tub feels rough, this is because water-hardening particles are deposited against the tub. Limescale is the cause of this. You can easily solve this by deflating the tub and cleaning it properly.
The tub is only clean when the deposit has been removed. This is often quite easy to do with a non-aggressive cleaning agent and a cloth. When you refill the hot tub, it is important to maintain the pH values properly with a value between 7.2 and 7.8.
You can also always add some extra descaler or water softener.