Skip to product information
1 of 8

Calcium Increaser for Hot Tub

Calcium Increaser for Hot Tub

137 reviews
Regular price $19.99
Regular price $25.00 Sale price $19.99
Sale Sold out
Shipping calculated at checkout.
Size
Pack
Product Details

Our Calcium Increaser maintains optimal balance, shields against equipment corrosion, and ensures crystal-clear, cloud-free water for a pristine spa experience.

How to use

1 level capful (2 level tablespoons) of this product will increase the calcium of a 500 gallon spa by approximately 10 ppm.

DIRECTIONS for use:

  1. Determine amount of product to be added using a calcium hardness test kit.
  2. Pour proper amount into spa or hot tub with equipment turned ON.
  3. Run filter for 1-2 hours.
  4. Water may be retested in 20 minutes.
Frequently Asked Questions

How do I decrease calcium levels in my hot tub?

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.

What if Calcium scale deposits have formed on my hot tub?

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.

Where is AquaDoc's Calcium increaser made?

Our product is proudly made, packaged, and shipped from the USA.

View full details

Why is AquaDoc the Best in Pool Chemicals?

  1. 🌿 Paraben free & Aluminum free
  2. 📦 Fast Shipping
  3. 🇺🇸 Made in the USA

Order With Confidence

If our products don't solve your (pool or spa-related) headaches, contact us for a 100% refund. Free shipping on all orders over $75!  

As seen on

100% Paraben Free

Say goodbye to parabens that can potentially be harmful to your family. All of AquaDoc's chemicals are paraben and aluminum free.

Customer Reviews
4.8 Based on 137 Reviews
5 ★
88% 
120
4 ★
9% 
13
3 ★
0% 
0
2 ★
1% 
2
1 ★
1% 
2
Customer Photos
Write a Review

Thank you for submitting a review!

Your input is very much appreciated. Share it with your friends so they can enjoy it too!

Filter Reviews:
V
10/07/2023
Victor

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.

A
10/06/2023
Amazon_Obsessed

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.

M
10/03/2023
Mark

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.

DH
09/30/2023
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.

LM
09/16/2023
Leo M.

Great kit

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