Sirona Alkalinity Up | Spa Alkalinity Increaser

• 1 x Sirona Alkalinity Up (2 lb container, granular)

• Raises total alkalinity — brings low alkalinity up into the safe 80–120 ppm range
• Prevents pH bounce — creates the buffer that keeps pH stable and consistent
• Gently raises pH — nudges low pH upward as it corrects alkalinity
• Protects equipment — guards your heater and components against corrosion from low, acidic water
• Boosts sanitizer effectiveness — properly balanced water lets chlorine or bromine work efficiently
• Works with every system — compatible with chlorine, bromine, and biguanide

The active ingredient, sodium bicarbonate, dissolves into the water and raises its total alkalinity — the water's capacity to absorb and neutralize acids without letting pH swing. Think of alkalinity as a cushion around your pH: with enough of it, the small acidic inputs a spa sees every day (from sanitizer, bather waste, even rain) get absorbed instead of knocking pH out of range.

The target range for a spa is 80–120 ppm. Sodium bicarbonate raises alkalinity strongly while nudging pH up only mildly, which is exactly what you want when alkalinity is the thing that's low. Once your alkalinity is set, your pH sits on a stable foundation — and stays there.

Pro Tip: Add it in stages and retest, rather than dosing it all at once. Alkalinity adjustments settle in over a few hours, so add a measured amount, let the water circulate for one to three hours, then retest before adding more. Working up to your target gradually keeps you from overshooting and having to correct back the other way.

Test your water first with Sirona test strips to determine your starting total alkalinity. Use when alkalinity tests below 80 ppm, aiming for a target range of 80–120 ppm. Always follow the package label for exact dosing.

1. Determine the amount of Alkalinity Up needed for your spa's volume and current reading.
2. With the equipment off, add the product directly to the spa water. As a general guide, about 1 ounce (2 tablespoons) is a typical starting dose — see the label for the amount matched to your spa size.
3. Turn on the circulation system and let the water circulate for 1 to 3 hours.
4. Retest the total alkalinity. If it's still below 80 ppm, repeat until it sits in the 80–120 ppm range.

Because this product also raises pH, recheck pH after your alkalinity is set and fine-tune it if needed.

Pro Tip: Set alkalinity every time you refill, as your very first balancing step. A fresh fill is a blank slate, so establishing alkalinity right away — before pH, calcium, or sanitizer — means every product you add afterward lands in stable water. It's the single habit that makes a whole water-change cycle easier to keep balanced and clear.

• Brand: Sirona (Sirona Spa Care)
• Also Known As: Sirona Spa Up
• Part Number: 82100
• Product Type: Total alkalinity increaser (balancer)
• Form: Granular
• Net Weight: 2 lb
• Active Ingredient: Sodium bicarbonate (100%)
• Function: Raises total alkalinity; gently raises pH; prevents pH bounce
• Target Level: Total alkalinity 80–120 ppm
• Use When: Total alkalinity tests below 80 ppm
• Dosage: Approx. 1 oz (2 tbsp) starting dose; follow label for spa size
• Retest: Circulate 1–3 hours, then retest and repeat if needed
• Benefits: Stabilizes pH, protects equipment from corrosion, improves sanitizer effectiveness
• Compatible Sanitizers: Chlorine, bromine, and biguanide
• Application Note: Add directly to spa water with equipment off, then circulate; never mix with other products in the same container
• Shipping: Standard ground; not classified as a hazardous material (eligible for mail return under standard policy)

Sirona Alkalinity Up is compatible with all sanitizer systems, including chlorine, bromine, and biguanide. As a balancer, it's part of the foundation you set before and alongside your sanitizer, no matter how you sanitize.

It works hand in hand with the rest of the Sirona balancing lineup: Spa Down (to lower pH and alkalinity when they run high), a calcium increaser, and Sirona test strips to read your levels. The proper sequence when balancing fresh water is alkalinity first, then pH, then calcium hardness — get those three in range and your sanitizer and clarifier can do their best work. Never mix it with other products in the same container; add it directly to the spa water.