I've seen septic question in a lot of other forum areas but figured this might be the best.
To my belief the products you flush down the toilet aren't worth it. Even if they worked, they are more of a maintenance that a fix. My septic system is 26 yrs old and the soil is sandy. It has a 1000 gal tank. Despite pumping every 3 to 5 yrs, about 5 yrs ago, I experienced wet spots when the washing machine emptied. (she did a lot for the years kids were at home).
Most of the neighbors on my street with houses built at the same time have had new field put in over the last few years. Because I added 1,000 sq ft to my house, my tank and field isn't big enough. The inspector said to make existing tank a pump station, run a line to back yard, put in two tanks and a larger field.
Not wanting to shell out really big bucks, I alleviated this with a grey water system in the back yard (field is in front yard). Grey water from washer, bathroom sink and shower goes into grey system) Now, I am wondering about the front field. Is it likely greatly reduced water volume going into original system over the past 5 yrs has allowed the sandy soil to percolate better? The the only things going to the tank are poop, (wife and myself) kitchen sink and dishwasher. The back yard grey system has worked fine with never a trace of wetness and it probably will work forever, but I am not sure about the legality if I sell the house.
I've also read about people who come out and inject compressed gas or something into the field to rejuvenate the field. Any thoughts on this?