Camco TST Drop-Ins eliminates toilet odors on contact. Just add one Drop-In to treat a 40 gallon tank; no measuring and no mess. Single doses are conveniently packaged in a re-sealable plastic bucket. • Made in the USA• Lubricates sensors• Non-formaldehyde; safe for septic tanks• dissolves instantly• Packet of 30 single doses• Original scent One drop-in treats a 40 gallon tank Safe for septic tanks Dissolves instantly | TST Drop-Ins 30-Pack Bucket, Original Scent Made in USA