For when you need to raise the pH value of your hot tub to the required 7.2 to 7.6 pH.
The ideal pH levels are between 7.2-7.6, promoting bather comfort, optimum chemical efficiency and protection of Hot Tub equipment. Test the pH of your water, and if it is below 7.2, use pH plus to raise it.
See risk and safety phrases on container!
Handle products in a well ventilated area - preferably outdoors.