SpaGuard Alkalinity Increaser Tabs | Rapid-Dissolve

• 1 x SpaGuard Rapid-Dissolve Alkalinity Increaser Tabs — 1.25 lb (effervescent tablets; approx. 30 tabs)

Note: These tabs raise total alkalinity. Apply them to the filter compartment with the jets running for the best results. Water may cloud briefly after a start-up dose or a large correction — that's normal and clears as it circulates. Keep the bottle tightly sealed and store in a cool, dry place.

• Raises total alkalinity — restores the buffer that stabilizes pH.
• Eliminates pH bounce — stops the erratic pH swings caused by low alkalinity.
• Protects equipment and surfaces — guards against corrosion and damage from low alkalinity.
• Effervescent rapid-dissolve tabs — fizz apart to disperse quickly and evenly, no measuring powder.
• Easy, precise dosing — about 2 tabs per 250 gallons raises alkalinity ~30 ppm.
• Works with every common sanitizing system — chlorine, bromine, ozone, saltwater, and mineral.

Total alkalinity measures the water's capacity to resist changes in pH — think of it as a cushion. When alkalinity is healthy, adding chemicals or bathers nudges pH only slightly and it settles back. When it's too low, that cushion is gone and pH lurches up and down at the slightest disturbance, which is the "bounce" that makes balanced water feel impossible to hold.

These tabs are sodium bicarbonate, compressed into an effervescent tablet. Dropped into the filter compartment with the jets running, each tab fizzes apart and dissolves within minutes, raising the alkalinity reading and rebuilding that buffer so pH stays put. Because sodium bicarbonate also gently supports pH, it helps bring both readings into a stable, balanced state. Adding the measured number of tabs and retesting lets you reach the target range precisely without overshooting.

Pro Tip: Alkalinity and calcium hardness are the two "background" numbers that make everything else behave. If your water won't hold a stable pH, check alkalinity first; getting it in range is the foundation that lets your sanitizer and shock actually do their jobs.

1. Test the total alkalinity of your spa or swim-spa water with an accurate test method. The target range is 80–120 ppm.
2. Using the chart on the label and your test result, determine the number of tabs needed. As a guide, 2 tabs per 250 gallons raises total alkalinity by about 30 ppm.
3. With clean, dry hands, apply the tab(s) directly to the filter compartment with the jet pump running.
4. Allow a few minutes for the tabs to dissolve and disperse, then retest and adjust as needed.

Pro Tip: Always follow the dosing chart and directions on your bottle's label, which take precedence over any general guidance. Apply to the filter compartment with jets running for the fastest, most even dissolution — and don't be alarmed by brief cloudiness after a larger dose.

• Product: SpaGuard Rapid-Dissolve Alkalinity Increaser Tabs — Spa Water Balancer
• Brand: SpaGuard (BioGuard family)
• SKU: 42661BIO
• Size: 1.25 lb (approx. 30 tablets)
• Form: Effervescent, rapid-dissolve tablets (1″ tabs)
• Function: Raises total alkalinity; stabilizes pH and prevents pH bounce
• Active Ingredient: Sodium Bicarbonate (~60%) (confirm from label)
• Dose: ~2 tabs per 250 gallons raises total alkalinity about 30 ppm
• Target Total Alkalinity: 80–120 ppm
• Application: Filter compartment, jet pump running
• Expected Effect: Temporary cloudiness after a start-up or large dose is normal
• Prevents: pH bounce; corrosion and damage from low alkalinity
• Suitable For: Spas and swim spas
• Sanitizer Compatibility: Chlorine, bromine, ozone, and saltwater/mineral
• Surface Compatibility: Safe for all common spa surfaces
• Country of Origin: Made in USA
• Shipping: Ships UPS Ground only (confirm from backend)
• Hazmat Classification: Non-hazardous (sodium bicarbonate); not a DOT-regulated chemical

Alkalinity Increaser Tabs are a water balancer that works with whatever sanitizing system you use:

• Chlorine spas — fully compatible.
• Bromine spas — fully compatible.
• Ozone systems — compatible as part of a balanced-water routine.
• Saltwater / mineral systems — compatible.
• Spas and swim spas — formulated for the smaller volumes and higher temperatures of spas.
• All spa surfaces — safe for use with all common spa surfaces.

Important: Alkalinity Increaser Tabs are a balancer, not a sanitizer. They correct water chemistry but don't sanitize — use alongside your regular sanitizer and shock.