AquaDoc Hot Tub pH Decreaser - 32oz - Spa pH Down for Water Balance - Hot Tub Chemicals Made in USA

Works really quick

This works way better and a lot cheaper then my local hot tub supply store.

Hard wster

It worked, however it did actually take the whole bottle to decrease the alkalinity to a point where it was in the ok range.Once I added soda ash to increase the ph, the alkalinity just went right back up.

The instructions are clear and it works like a charm when I use it in my spa. I’m new to owning an inflatable spa, so just learning all of the chemicals is a challenge