AquaDoc Spa pH Decreaser - Sodium Bisulfate pH Down for Hot Tubs, 32 oz

So far so good, this works to lower PH as it says and keeps the water balanced to maintain clarity. It does not have any offensive odors. I basically add a sploosh of it when i add chlorine to my hot tub!

As described

Good quality

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.

It only takes a small amount (1 oz) to correctly adjust the pH level in our hot tub. How easy is that?

I love how this lowered the PH in my hot tub!

I have the aquadoc testing system and figured since the app gives recommendations tailored to their products I would purchase this PH down. I was a little apprehensive since this was liquid and not powder but I figured I would give it a try. App said add 2 oz but the bottle said add 1 once at a time and then test in 30 minute so that is what I did. Four ounces later and the PH didn't budge at all. Since I ran out of time I started bright and early the next day 16 ounces later and PH didn't budge. I finally got the PH to come down but that was after using the entire bottle, and then it was too low which started a who new fiasco. The powder may work better, I don't know but the liquid was a waste of time and money.

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