Besides roots, sanitary products are the most common cause of that pesky overflowing drain. Don’t flush tampons, sanitary pads, nappies, baby-wipes, and ‘flushable’ wipes down your drain. These products are an ongoing cause of blocked drains.
Dissolved grease and fats solidify in your lines blocking them up, always allowing cooking fats to solidify before flushing them away and poor oils into containers for disposal.