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AquaDoc Spa Calcium Hardness Increaser Hot Tub Owners Rely on, Calcium Increaser Spa Hardness Increaser & Calcium Booster for Hot Tubs, Spa Calcium Increaser & Hot Tub Water Hardener Spa Chemicals

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$17.99

$ 8 .99 $8.99

In Stock

About this item

  • Make balancing your water easier & more cost effective with AquaDoc's calcium hardness increaser. Our spa calcium hardness increaser is vital to ensuring proper water hardness levels in your hot tub. AquaDoc's Calcium Booster gets your hardness up.
  • Avoid corrosion, etching, and staining - AquaDoc's Professional Grade Hot Tub Calcium increaser is your best defense against soft water in your hot tub or spa. Guard calcium levels from decreasing too low with our spa Calcium booster for hot tubs.
  • How it works - AquaDoc's Hot Tub Calcium hardness Increaser works to raise your water's hardness level to ensure properly balanced hot tub water. Our spa hardness increaser easily works to raise your Calcium levels by 10ppm increments or more.
  • The Hardness Increaser Hot Tub Owners Love - When it comes to Spa Chemicals calcium hardness increaser is a must have. Without hot tub chemicals calcium hardness can become unbalanced. Always have a hot tub calcium booster ready and waiting.
  • Easy to Use, Made in the USA - (1) Check your calcium levels, (2) 1 ounce of AquaDoc's Calcium increaser will boost water's hardness level by 10ppm. (3) After determining hardness level goal, add proper amount of increaser while equipment is on. (4) Run filter for 1 - 2 hours, wait 20 minutes, then retest water.



Product Description

Calcium Increaser Granules | Calcium Balancer

Calcium increaser for jacuzzi and hot tubs. Pool Calcium.
Best calcium increaser. Boosts calcium water levels. Calcium in liquid form. Spa calcium chloride.
Hot tub calcium balancer. Hot tub calcium care. Spa care chemicals. Balance spa water calcium level.

calcium increaser

calcium increaser

calcium increaser

How to use AquaDoc's Calcium Increaser Granules

HOW TO INCREASE CALCIUM LEVELS IN YOUR HOT TUB

  1. Before doing anything, always check your water levels. The level of calcium hardness should be 180 - 260ppm. 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 granules will increaser 500 gallons of water's hardness level by 10ppm.
  3. After determining hardness level goal, pour product into 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.

AquaDoc's spa calcium booster and all other hot tub chemicals are proudly made in the USA.


Kathleen P.
2025-08-30 16:27:47
We purchased this to help balance the water in our spa. We use bromine, not chlorine. The product qas easy to use, was reasonably priced and very effective.
JB
2025-07-25 14:58:44
Good product, good price
Christopher R.
2025-07-08 17:07:07
This is a very good product, better than other brands that I use to use. This one is very high quality. It works very well. It keeps my water crystal clear. Once I added this to the spa, the water changed in 20 minutes. This works super fast. It is perfect. I will buy again for sure.
debra cavett
2025-06-11 12:24:03
A little pricey
Justin Gardner
2025-05-24 13:31:47
This product is excellent for our Jacuzzi J-345. The water tends to get soft in Ohio and this is a perfect power. One cap full will treat the whole tub and bring it up 1-2 color shades on the test sticks.
CHRISTOPHER G COX
2025-03-21 18:30:15
Used in a hot tub
Eric
2025-02-23 10:49:32
This product made it simple to correct the hardness level of my Spa and will help prevent corrosion to my system.
Hoops
2025-02-07 17:34:46
We recently changed the water in our hot tub and needed this product to get the water properly balanced . Worked well.
Nadine
2025-01-25 14:43:18
Produit vraiment bon
Steve
2025-01-24 21:04:08
Unfortunately one cap was not screwed on type and it mostly ended up in the broken bag and lost some , there were 2 bottles and the product worked well .
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