SANI STICKS? the concentrated cleaning and sanitation sticks you drop in the drain once a month to prevent backups, clogs and nasty odors before they start. Keep Your Drain Pipes Clear and ODOR-FREE All Year Long! Now in a NEW Lemon Fresh Scent! Perfect for the kitchen, vanity, bathtub and utility/mop sinks. Safe for septic tanks. Includes enough Sani Sticks to treat 2 drains for one year.