ProTeam Supreme Plus is a borate that requires no pH adjustments after application. The Supreme Plus was reformulated to be more effective than the original Supreme and is pH neutral, meaning you do not need to add acid on start-up. Also, sanitizers work most efficiently when pH is in range Makes pool water softer and easy to balance. Supreme Plus is an enhancer that reduces eye and skin irritation, controls algae, and improves filtration. Supreme Plus is made in the USA, and is the highest possible quality borate.