Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water
Calcium Increaser for Hot Tub Water

Calcium Increaser for Hot Tub Water

Sale price$18.99 Regular price$25.00
Save $6.01
137 reviews
Quantity:1 Bottle

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🌫️ Maintains optimal water balance

💧 Helps prevent corrosion of spa equipment and surfaces

🧼 Keeps water clear and free from cloudiness

"Extend the life of your hot tub or spa! Saves time, easy to use, and high value for money spent. Softness of the water is 👌" - Ash

Why is AquaDoc the Best in Hot Tub Chemicals?

🌿 Paraben free & Aluminum free

📦 Fast Shipping

🇺🇸 Made in the USA

Advanced Spa Water Calcium Increaser

Calcium levels low? Proper calcium levels in your hot tub make managing pool chemistry significantly easier and cost-effective. It makes your water balance more predictable and therefore easier to manage - resulting in less chemical waste.

Avoid corrosion from soft water with our premium Calcium hardness increaser

Our Calcium Increaser is a must-have

  • Low calcium can cause corrosive water
  • Helps prevent etching & staining at your hot tub's surface level
  • Makes balancing water easier and more cost-effective

How to increase calcium in your hot tub

  1. Before doing anything, always check your water levels. The level of calcium hardness should be 180 - 260 ppm. However, if you have a saltwater spa system, your hardness level should be between 40ppm to 80ppm.
  2. 1 ounce of AquaDoc's Calcium increaser will increase 500 gallons of water's hardness level by 10ppm. 
  3. After determining the hardness level goal, pour the product into the spa. Please note, the equipment must be on while adding calcium increaser.
  4. Run filter for 1 - 2 hours, wait 20 minutes, then re-test water.
  5. It's always better to underdose at first and measure before adding more.

Trust in AquaDoc

You can trust that our pool and spa chemicals are held to the highest quality standards.

  • Proudly made in the USA
  • Advanced, Professional Grade Formula
  • 100% Money Back Guarantee

Order with confidence

  • Satisfaction guarantee! If our products don't solve your (spa-related) headaches, contact us for a 100% refund. 
  • Free shipping on all orders over $50!   

Frequently Asked Questions about Calcium Increaser

Q: How do I decrease calcium levels in my hot tub?
A: If calcium levels are just a little high, drain some water from your hot tub and replace it with fresh water. Test levels and repeat if necessary. Always use AquaDoc's Stain & Scale control to keep Calcium levels at the proper levels.

If Calcium levels are extremely high, it's recommended that you completely drain your hot tub and refill.

Q: What if Calcium scale deposits have formed on my hot tub?
A: If you're already dealing with a scale issue, we recommend you use AquaDoc's Spa Stain & Scale formula to help remove and prevent future scale buildup. It's also recommended you take special care to balance your calcium levels moving forward to reduce overly hard or soft water. 

    Q: Where is AquaDoc's Calcium increaser made?
    A: Our product is proudly made, packaged, and shipped from the USA.

    Pro Grade Formulas

    Our products are trusted & used by professionals across the country.

    Made in the USA

    All AquaDoc products are proudly made in the USA.

    100% Satisfaction Guarantee

    If any of our products fail to live up to your standards, you get a refund.

    AquaDoc relieves your headaches

    Customer Reviews
    4.8 Based on 137 Reviews
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    All The Chemicals You Need To Keep Your Spa's Water Properly Balanced!

    If you already own a spa, or if you just purchased one, you are going to need some starter chemicals to get your water balanced. This kit includes everything you'll need to do just that. Once you run out of one of the chemicals, simply replace that particular bottle and continue keeping one of each in your home's stock. Highly recommended, especially for Amazon's low listed selling price.


    Everything you need!

    I was so pleased to find this Starter kit! Last year we had to buy every thing separately and let me tell you, you are saving not only time but also money buying it all together like this. It's so easy to use and you've got it all on hand. The products work quickly and accurately. I'll never go back to buying as needed, because at some point you will need everything.


    Perfect starter kit

    Just set up my hot tub yesterday and used some of these to get things started. I'm a pool and hot tub owner so I am familiar with chemicals.These dissolved just like they should and I didn't have any issues.This kit has about everything you need for your hot tub. Can't think of what might be missing.Overall, seems good.

    Dr. Healthy

    Get started with everything you'll need

    Starter set of chemicals has everything you'll need to get started with your hut tub. Using chemicals in a Coleman inflatable SaluSpa and this is our first hot tub. The directions are very clear and specify how much product should be used based on gallons of water or water readings from the strips. We most often use the ph decreaser, water clarifier, water defoamer, and shock. Also usimng the test strips. Chemicals do what they are supposed to do, although the ph decreaser takes more chemical than suggested in the directions. Although we're not likely to use the other products regularly, it's nice to have them on hand should we need them. Now that we've had a great start with our hot tub, we know which chemicals we'll need to buy in the future.

    Leo M.

    Great kit

    This kit comes with everything and anything you need to keep the right chemical accuracy in your tub.