Sirona Calcium Booster | Liquid Calcium Increaser

• 1 x Sirona Calcium Booster (32 fl oz liquid)

• Raises calcium hardness fast — goes into solution immediately for quick results
• Prevents foaming — corrects one of the most common underlying causes of suds
• Protects equipment — stops soft, corrosive water from attacking heater, seals, and jets
• Liquid convenience — nothing to pre-dissolve and no granules to settle on the shell
• Keeps water in range — maintains hardness between 150 and 400 ppm
• Broad compatibility — works with chlorine, bromine, ozone, and biguanide sanitizers

Calcium Booster adds dissolved calcium directly to your water, raising the calcium hardness reading. Water is naturally "hungry" for minerals: when it's low in calcium, it becomes aggressive and corrosive, drawing what it needs from your spa's metal components and surfaces. Give it enough calcium and that hunger is satisfied — the water becomes stable and non-corrosive.

The target range is 150–400 ppm: enough calcium to keep the water balanced, but not so much that it deposits as scale. Dosing is predictable — 1 fluid ounce raises calcium hardness about 7 ppm in 500 gallons — so you can calculate exactly what your spa needs. And because calcium hardness is stable once set, it isn't a weekly chore: correct it on a fresh fill and it holds until your next water change.

Pro Tip: If you fill from a water softener, you need this product. Softened water has had its calcium deliberately stripped out, which makes it aggressively corrosive in a hot tub — exactly the wrong water to run through an expensive heater. Test your fill water and bring hardness up to range right away, before that soft water has time to start working on your equipment.

Test the water first with Sirona test strips to determine how much Calcium Booster you need. Maintain a calcium level between 150 and 400 ppm. Add directly to the spa water with the circulation system running.

1. Test your calcium hardness to find your starting level.
2. Calculate your dose: 1 fluid ounce raises calcium hardness about 7 ppm in 500 gallons of water.
3. With the circulation running, pour the measured amount directly into the spa water. It goes into solution immediately — no pre-dissolving needed.
4. Let the water circulate, then retest and repeat as needed until hardness sits in the 150–400 ppm range.

Pro Tip: Sneak up on your target — don't overshoot. Calcium is easy to add but very hard to remove: the only real way to lower it is to drain part of the water and refill with softer water. Add a calculated dose, let it circulate, retest, and add more only if you need it. A little patience here saves you a partial drain later.

• Brand: Sirona (Sirona Spa Care)
• Part Number: 82103
• Product Type: Calcium hardness increaser (balancer)
• Form: Liquid — goes into solution immediately, no pre-dissolving
• Net Size: 32 fl oz
• Function: Raises calcium hardness; helps prevent foaming and equipment corrosion
• Dosage: 1 fl oz raises calcium hardness about 7 ppm per 500 gallons
• Target Level: 150–400 ppm calcium hardness
• Application: Add directly to spa water with the circulation system running
• Retest: Circulate, retest, and repeat until in range
• Especially For: Soft fill water, spas filled from a water softener, and chronic foaming
• Longevity: Calcium hardness is stable once set — typically adjusted at each fresh fill
• Compatible Sanitizers: Chlorine, bromine, ozone, and biguanide (incl. Sirona Simply)
• Application Note: Never mix with other products in the same container; add directly to spa water
• Shipping: Standard ground; not classified as a hazardous material (eligible for mail return under standard policy)

Sirona Calcium Booster is compatible with chlorine, bromine, ozone, and biguanide sanitizers — including the Sirona Simply system. As a balancer, it's part of the foundation you set when filling the spa, regardless of how you sanitize.

It completes the Sirona balancing set alongside Spa Up, Spa Down, and Alkalinity Up, and pairs with Sirona test strips to read your hardness level. The proper sequence on a fresh fill is total alkalinity first, then pH, then calcium hardness. It's also the root-cause partner to Foam Out: the defoamer clears foam now, while correct calcium keeps it from returning. Add it directly to the spa water; never mix it with other products in the same container.