- Know well about the local sources of water used for irrigation and the characteristics of suspended solids in water bodies. Is it underground well water, surface lake, or reservoir water? Since the source of water is different, the characteristics of suspended solids in the water body will be different, and the concentration of impurities will be different. Even sunlight, wind direction, and water intake location will affect the change of suspended impurities. Some have a lot of organic matter, and some inorganic matter has a lot of sediment, so be sure to know well the water source on site.
2. Clarify the requirements of drip irrigation pipes for the treatment of water quality by the filtration system. For example, the drip irrigation pipe configured in the irrigation design is a buried pipe or a drip tape that is changed once a year. As well as the length of the pipe, the range of pressure changes and the flow rate. These factors also determine the choice of filtration system. For the drip tape that is replaced once a year, the operating flow rate is large and the filtration system requirements can be appropriately reduced. The drip pipe for buried and small flow must be appropriately improved on the ordinary filtration requirements, and a certain amount of processing space is reserved for the system.
3. Know well about the conditions that must be met for the various filters to function properly. Before designing and applying a filtration system, it is necessary to understand the working principle and operating conditions of various filters, so that different filtration system solutions can be designed and selected according to the on-site water source conditions and the requirements of drip irrigation pipes. The purpose of the automatic backwash filtration system is to make the suspended impurities in the filtered water body smaller than the particle size required by the drip irrigation system, so as not to block the end drip irrigation pipe device.
Reference for filter type selection of different water drip irrigation systems
| Type of water source | Presence of impurities | Select a filter |
| surface water | Organic matter such as algae, organisms, and fungi, and inorganic matter such as sand | Sand media filter + automatic backwash disc filter or screen filter |
| groundwater | Sand and inorganic salts, sand content < 3mg/L | Centrifugal filter + automatic backwash disc filter or screen filter |
