Authentic Hammer-Head debris bags are hand made here in the USA and are inspected prior to packaging and shipment. Each bag has a tag with the Hammer-Head name that indicates what type it is.
We warranty them against defects in workmanship but not against wear and tear. Treat your debris bags with care. Dragging them on the bottom of the pool, the deck, or across the coping when lifting them out of the water can wear holes in them. Empty them frequently while vacuuming, and store them clean, dry, and out of the sunlight for the longest life.
Microns. A micron is one millionth of a meter, or approximately .00003937 inches. The smaller the micron number, the finer the bag. As debris goes, anything below about 40 microns is smaller than the human eye can easily see.