Powder to increase total alkalinity in Hot Tub and Pool water. Confused about your hot tub water chemistry? Our guides answer the most Frequently Asked Questions! Read our how-to guide on balancing your hot tub / spa / swimming pool water pH levels
5kg Castle Hot Tubs pH Plus
5kg Total Alkalinity Raiser
Spa Total Alkalinity Raiser 1Kg Relax Total Alkalinity Plus
Only used once and had the desired effect. Just useful to have small pot for emergencies as we don’t normally need it?
Haven't used it yet
Does it’s job
