The main reason that my family home’s septic tank needed to be pumped out in 1966 was because for the year before that our home was shared with my stepfathers family. We had 11 people living there for a year, all using the toilets, bathing and laundry was being done daily to the tune of at least 4 loads a day.
The home was a 3 bedroom 2 bath home built in 1961 and septic tank was sized appropriately for that many bedrooms and baths. The original builder planned on the home being occupied by 2 to 5 persons, not 11!
I don’t believe that the use of bleach in the white loads of laundry contributed to the necessity of the septic pumping at the 5 year mark. It was the massive amounts of excrement and toilet paper deposited in the septic tank by 11 people over one TERRIBLE year!
BTW, I was the unfortunate individual that found out the tank needed to pumped out. I had stayed home from school and was cleaning the house and doing the laundry for my Mom. I went back to the back bathroom to clean it and found 4” of gray water in the tub. I thought, who the hell was that dirty? Then I went into the kitchen where the washer was located and found that the laundry tub next to the washer had filled up with the same putrid water.
I immediately called Mom at work and within 90 mins there was a truck there to pump out the septic tank. The next time she needed to have it pumped out was 20 years later.
Eddie