Spa Total Alkalinity Increaser
Spa Total Alkalinity Increaser
Optimize alkalinity, stabilize pH, and prevent corrosion for a balanced spa environment.
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Our Alkalinity Booster optimizes levels (80-140ppm), stabilizing pH and preventing fluctuations. By warding off corrosion and etching, it ensures a stable, balanced spa environment for long-lasting enjoyment.

Test for total alkalinity with a reliable test kit. The desired range for total alkalinity is 80-140 ppm.
This product increases the effectiveness of the disinfectant, and helps prevent scale formation. It also prevents corrosion of metals, etching of spa surfaces, eliminates “bounce”, and maintains pH at the proper level. Easy to use; dissolves quickly.
- Add 1 oz. (2 tbsp.) to spa water.
- Allow water to circulate for 30 minutes.
- Retest water and repeat Steps 1 and 2 until the desired level is reached. For best results, dissolve granular products first by adding to a small plastic pail filled with water.

Why is alkalinity important for my hot tub or spa?
Alkalinity plays a crucial role in maintaining stable pH levels in your hot tub or spa. Proper alkalinity prevents rapid pH fluctuations, ensuring balanced and comfortable water.
How do I use AquaDoc Alkalinity Increaser to adjust my spa's alkalinity?
Simply follow the instructions on the product label. Add the recommended amount of AquaDoc Alkalinity Increaser to your hot tub or spa water and allow it to dissolve for even distribution.
Is AquaDoc Alkalinity Increaser compatible with different hot tub sanitizers and water systems?
Yes, AquaDoc Alkalinity Increaser is designed for use with various sanitizers, including chlorine, bromine, ozone, and more. It's versatile and suitable for different hot tub setups.
How often should I test and adjust the alkalinity in my hot tub or spa?
Regularly test and adjust alkalinity as needed, especially when you refill your hot tub or spa. Aim for a total alkalinity level within the recommended range to maintain water balance.
Why is AquaDoc the Best in Pool Chemicals?
- 🌿 Paraben free & Aluminum free
- 📦 Fast Shipping
- 🇺🇸 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!
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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.
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Great product
This product is awesome wouldn’t buy anything else
Works, but Needs Higher Dosage Than Recommended
The AquaDoc Alkalinity Booster does the job, but I've found that I need to use more than the recommended amount to see noticeable results in my hot tub. It does help balance the alkalinity effectively; however, it would be great if the suggested dosage was a bit more accurate for quicker results. Overall, it’s effective, but be prepared to adjust the amount based on your needs.
Great price
Good size for the price. Brought down my alkalinity with no problems.
Works Well
I got this product for my hot tub and it seems to be working. My test strips read that everything is looking good, so I just kind of have to assume this is doing its part when used.
Increases the alkalinity of hot tub water
I am a newbie when it comes to hot tub maintenance, but have been told by several people that one of the most important things you can do is keep the alkalinity at the appropriate level. It keeps the water from becoming corrosive, helps the other chemicals work better, helps prevents staining, etc. I have compared this to another product that I purchased for this purpose and it appears to work just as well as the other for raising alkalinity levels. This is made of 100% sodium bicarbonate, which is a widely used product with a lot of applications.
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