Quality Material & Excellent Performance:Made of high quality ABS material, which features great insulation function; its maximum flow-through is up to 10000 L/H, suitable for decorative ponds of 2500 gallons and fish ponds of 1500 gallons. 4 Filter Sponges & Cleaning Indicator: 4 filter sponges can be removed, washed or replaced to ensure the balance of water flow. Yellow and blue sponge density is different to increase filtration efficiency. An indicator will float up to remind you that the filter needs to be cleaned. Function Switch & Water Pipe Adapter:The switch on the top can be easily rotated to sewage and drainage through 2 exists, you can adjust it according to your different needs. The water pipe adaptors can match with different diameters of water pipes. There are different sizes of drain holes, which can be adapted to different water pipe widths.