The Rapid Clear Fine Filter Pad significantly speeds up filtering of smaller debris that is often difficult to catch and remove from the pond. Simply place the mat inside of the skimmer box, cut to fit and watch the impressive results. The Rapid Clear Fine Filter Pad is best used in combination with Rapid Clear Flocculant water treatment to enhance water clarity and quality quickly. Three 12″ by 24″ filter pads are included. Use the Rapid Clear Fine Filter Pad only until water is clear, then return to using regular filter media.