Dejapoo, we have seen this crap before!
Driving over the drain field!
Using flushable wipes!
Flushing or adding any store bought additives to the tank!
Long periods between pumps!
Toilets that run all the time - This can overwork or saturate the drain field!
NEVER FLUSH OR ALLOW TO GO DOWN THE DRAIN ANY:
Fats
Oils
Paint
Grease
Wipes
Makeup
Condoms
Chemicals
Medication
Feminine products
Needles from insulin or drug use
Excessive amounts of anti-bacterial soap or bleach