A: Depending on the size of the family, every three to five years. Inspect the tank after five years, and once a year after that, and when solids and scum equal one third of the liquid depth, have the ...
Christin Perry is a freelance writer whose work has appeared in numerous outlets, including WeddingWire, The Knot, Parents and Verywell Family. When she's not working, Christin enjoys reading, ...