One Second Plumber Instant Drain Opener is easey to use and clears obstructed drains safely. It even works on stubborn slow-moving drains caused by hair, soap buildup and grease. It is safe to use on any sound plumbing and even on Septic systems. Kit comes with adapters that work on most drains such a sink, toilet, tub, shower, floor drain, garburator, urinal and is even safe to use on boats and trailers. Maintenance: Use monthly to keep drain pipes clear from obstructions.