Be somewhat careful with laundry bleach and tub & toilet cleaners. An
over abundant usage can upset the balance of bacteria in your tank.
Other than that you're doing everything right and will probably be
good for 10-15 years between services.
Yes, unless the tank is dramatically undersized or there are other
problems you can put it off for a good LONG while. I built one new home
in 1973 and the tank was not pumped until I sold it in 1992 (19 years).
Built another new home in 1991/1992 and sold it in 2004 (~12 years) and
never pumped it even when I sold it. Two people probably 50% of the
time, three 25% of the time, and one the other 25% of the time in the
first home and two all the time in the second home. This current (third)
home is on a sewer system.
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