Our experience with a new house in 1990. The leach field was built in a burm format on a relatively wet lot. After about a year, we were a bit freaked out by lower grass areas that would remain soggy and smelly. We used one of those products that has bacteria and was claimed that it would help open the drainage in the leach field.
I was pleased to see that it actually appeared to work quite well. We used the product for the next 5 years once a month. We also used it on an older system at RG's grandfathers house and it worked there as well. The muddy back yard dried up for the first time in a few years.
For what it's worth.
RG now uses the following formula every 6 months: 10 packets of yeast and 2 cups of sugar in a pail around 115 degrees. When it starts blooming in the bucket, she flushes it down the toilet. We pump about every 3 years and the tech reports that the tank is very healthy.
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