Very easy. With a minimum amount of tools, and depending on the model of stool you have, normally less than an hour. They do work very well in controlling odor, and it saves me money on how much chemical I end up buying.
Some will say you don't need chemical if you flush/rinse the tank properly; I've not found that to be the case for me. Was downwind in a crowded campground one hot 4th of July weekend from someone who wasn't using any chemicals. Very nasty...
On a sidenote, the inventor of this product lives about 12 miles from me in the next town. I have met him on several occasions at RV shows and such, always a pleasure to speak with and seems to really stand behind his product.
Aaron
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