Need help closing?

Join us at Pool School to learn what you need to close your pool like a pro!


We're hiring!

Join our team and enjoy an engaging work environment with a fun, feels-like-family atmosphere. Full-time and part-time positions available!


New course available!

Learn about safe handling of chemicals with Pool Care 103 and get closer to that Pool Guru badge!

Check it Out

Manage your pool like a pro!

Learn the 5 Keys to Pool Care to maintain a sparkling pool and save money too!

Start Here


In-Store Pick Up

Pick Up In-Store

Fill in your information and a preferred location. We'll have it ready for pick up within 2 hours. Your orders will remain available for 72 hours.

16.68 - Total Alkalinity Increaser 2#

Select your Store *


Total Alkalinity Increaser for Spas & Hot Tubs.

  • Raises total alkalinity
  • Eliminates "pH bounce"
  • Helps prevent equipment & spa surface corrosion & damage
  • Helps control pH
  • Helps prevent equipment and spa surface corrosion and damage
  • Protects spa surface and equipment by buffering against pH change
Product Info

Available sizes: 2lbs

  • 100% sodium hydrogen carbonate
  • 1 Tbs. per 100 gallons raises total alkalinity 25 ppm
  • Powder form
How To Use
  • Broadcast into spa with the circulation running (no aeration).

See chart below for dosage:

Spa Volume Increase TA 25ppm Increase TA 50ppm Increase TA 75ppm Increase TA 100ppm
100gal 1Tbsp 1 2/3 Tbsp 2 1/2 Tbsp 3 1/3 Tbsp
200gal 1 2/3 Tbsp 3 1/4 Tbsp 5 Tbsp 6 1/2 Tbsp
250gal 2 Tbsp 4 Tbsp 6 Tbsp 8 Tbsp
300gal 2 1/2 Tbsp 5 Tbsp 7 1/2 Tbsp 10 Tbsp
400gal 3 1/4 Tbsp 6 1/2 Tbsp 10 Tbsp 13 Tbsp
 * 4 Tbsp = 1/4 cup