Sirona Alkalinity Up | Spa Alkalinity Increaser

Sirona Alkalinity Up (also known as Spa Up) is a granular alkalinity increaser that lays the foundation for balanced, comfortable, worry-free spa water. Made from 100% sodium bicarbonate, it raises low total alkalinity — and with it, gently brings up pH — so the rest of your water chemistry can finally hold steady.

Total alkalinity is the quiet hero of spa care. It's the buffer that keeps your pH stable, and when it runs low, everything gets harder: your pH starts to "bounce" — swinging up and down unpredictably from the smallest change — the water turns corrosive and eats at your heater and equipment, sanitizer becomes less effective, and soaking can sting your skin and eyes. Chasing pH while alkalinity is low is a losing battle, because there's nothing holding pH in place.

Set your alkalinity into range with Alkalinity Up and that instability disappears. pH steadies, your sanitizer works efficiently, your equipment is protected, and the water feels gentle and inviting — the balanced base that turns routine maintenance into a truly restorative soak.