This is a 275 gallon tank ($85) that contained food grade silicone. It was easily cleaned out thoroughly. The pipe going into it is from the gutter off the back of the roof which is slanted toward the back. The gutter runs directly into a larger pipe type of downspout which is plugged. When the downspout fills up, it "spills over" into the pipe shown here and fills the cistern. This water will be filtered and used for showers and dish washing. Flickr - Photo Sharing!