SpaGuard Total Alkalinity Increaser, 2 lb, Prevents pH Bounce, Proven Pool Water Balancer, Suitable for Spas and Hot Tubs

This stuff works good for me. I mostly only need it after a tub refill. It's important to be patient when adding it. At first it seems like you are adding a lot and nothing is happening, but once the alkalinity starts to move you won't need a lot more - it starts to move quickly.

Exactly what my Hot Tub shop sells, but at a way cheaper price!

I have been using this brand for years. It works!

As advertised

This brand is my favorite. I have the best water clarity and quality when using this.

I have a 200 gallon hot tub. The water gets yellow fairly quickly but this clears it right up.

It works.

Great product, does exactly as advertised, packaged well