Design for the following area: Efficient filtration for faster breakdown of harmful substances and long operation. Filtration includes mechanical, biological, adsorptive and chemical components. Ideal and excellent performance use for Koi or Fish Ponds Feature: Backwash Function, not require open the filter to do cleaning. Strong UV resistance ABS body STAGE 1 - MECHANICAL FILTRATION: Water is pumped into the filter creating the necessary pressure to begin the mechanical filtration stage. Two foam discs collect various sizes of unwanted organic debris encouraging the growth of large numbers of beneficial bacteria which break down harmful pollutants. STAGE 2 - BIOLOGICAL FILTRATION: At this stage the water passes through the bio-balls at the bottom of the filter. These have a large surface area & provide a habitat for beneficial bacteria to grow which naturally convert the harmful toxins of ammonia & nitrites into useful nitrates to supporty a healthy pond environment. STAGE 3 - UV CLARIFICATION: The water which may contain microscopic suspended algae spores passes the 7W UV clarifier and killing the spores to give crystal clear water. The pond filter complete with total bio balls,It can clean up pond up to 4000L pond with waterplant life with No fish, 2000L pond with waterplant life with some goldfish/natives or 1300L with some Koi Carp. Heavy duty, durable and reliable. Technical Specifications: Voltage: 240V (Use safety power cable and plug, all sealed design for outdoor use) UVC power:7W Pond Capacity:Max 4000L Canister Capacity:10L Comes with hose connectors Step-down outlet adaptor 12.5/20/25mm & 1"BSP male threaded outlet & inlet Size(cm):33.5 X 28.9 X 40.4 12 Months Warranty-Pumpstore is Online Water Pump Store & Leading Pumps Supplier Post have experiencing increased parcel volumes and might have some delivery delays than usual. We suggest choose express postage $15 as that will handle in priority than flat rate $5 postage. For more info please visit https://www.nzpost.co.nz/