If the manufacturer of the product can state that the end bi-product results in carbon dioxide and water, then it would be a product that would be beneficial to your septic system. If the manufacturer cannot make that claim then it would not be a product worth purchasing, with one exception. That exception would be if the digesting agent could consistently be evenly distributed within the drainfield without having to go through the septic tank first. If that could be done then the agent would more than likely be of some benefit to your POWTS.
There typically are more than enough bacteria in the wastewater generated daily to do a sufficient job of digesting the biodegradable material in the waste stream. There comes a point where the solids that remain in the tank can no longer be digested and will not be able to undergo further digestion.
If you use strong cleansers conservatively and feel the need to add a digesting aid to assist the bacteria in your septic tank you could add several cakes of yeast to boost the digestion process for a while.
The statement of “saving costs” on pumping your septic tank does not appear to make sense for people living in Wisconsin. All septic systems installed within the last 25-30 years in the State of Wisconsin are required to have the septic tanks pumped at least every 3 years. Where would the cost savings come from?