Yes it is very important to have the contents of your septic tank emptied out (pumped), to remove floating scum and sludge that accumulate. If either floating scum or sludge is allowed to enter the soil treatment system (cesspool) it will cause expensive and often irreparable damage. Never go more than 36 months between cleanings!! Cleaning, or “pumping” as it’s often called, must be done by a licensed and bonded professional. Proper cleaning will remove ALL scum, sludge, and liquid from the septic tank(s). This requires pumping, flushing, and back flushing liquid contents back and forth between the truck’s tank and the septic tank through the manhole several times. This process breaks up all scum and sludge in the tank, allowing all solids to be removed. Depending on your service provider, they may land apply it after a treatment with lime, inject it in to the soil with a special attachment for doing that or some use a municipal wastewater treatment plant.