When it comes to a sewer system car and maintenance starts with what you put down your drains and toilets. Replacing sewer lines isn’t something that any homeowners wants to have to do, so preventative care and maintenance is important. There are a number of things that can affect the lifetime of a sewer system, but if a sewer is around 40 years old, experts say it’s probably going to need replacing. Replacement has gotten easier with the use of trenchless pipe bursting, but avoiding replacement is always easier. Here are three things you should never dump down your drains…