Shop › Bioguard Spa Perfect Balance Image 1 of 1 Bioguard Spa Perfect Balance $54.70 Controls ph, total alkaline and calcium in one easy step, improves heater efficiency and softer spa water. Add to cart Added! Controls ph, total alkaline and calcium in one easy step, improves heater efficiency and softer spa water. You Might Also Like Aquality 500g - PH & Alkaline Decreaser $24.40 Algon Hot Zone 1L $34.95 Pool Magnet Plus - 946ml $69.40 Velvet - 1kg $41.20 MSA Extreme 946ml $75.75