Generally speaking, under all normal operating standards of pure water equipment, RO reverse osmosis membranes are also likely to be contaminated by inorganic compound deposits, colloidal solutions, microbial strains, hydroxides, and other environmental pollutants. These chemicals accumulate on the surface of the membrane, causing a decrease in the loading rate or desalination rate of the reverse osmosis equipment, an increase in pressure difference, and even irreparable damage to the membrane. Therefore, in order to better restore good permeability and desalination characteristics, organic chemical cleaning of the membrane must be carried out. Quartz sand filters are usually cleaned every 3-12 months. If it is necessary to clean them every month, it indicates that the preparation system software should be improved and the main operating parameters should be adjusted. If it is necessary to clean once every 1-3 months, it is necessary to improve the operating level of the machinery and equipment. It is difficult to distinguish whether it is necessary to improve the software of the preparatory processing system.

The cleaning and backwashing of quartz sand filters belong to different practical operation purposes. Cleaning is done in a posture where the efficiency of backwashing is reduced; And backwashing is to remove environmental pollutants and chemicals captured in the filter, promoting the filtering effect of the filter to be continuously activated. The actual operation opportunity of backwashing quartz sand filters is mainly based on the decrease in the total flow rate of the circulation system pipeline per unit time to distinguish the efficiency of the filter. In practical operation, the majority is distinguished by the increase in the working pressure of the filter, that is, the pressure difference or resistance.

The pure water equipment quartz sand is mainly used to remove suspended solids, fine sand, organic compounds and other residues from the water, which is mainly completed by intercepting the flow of quartz sand. After a period of operation of the quartz sand filter, there are many fine particles such as mud, organic compounds, and other residues between the gaps of the sand. If backwashing is not carried out, the fine sand will block the water base, and the working pressure of the filtered effluent will decrease, resulting in a decrease in the total flow rate. This not only consumes precious electrical energy (electromagnetic energy, centrifugal water pump shows driving force), but also reduces the filtered total flow rate, which cannot achieve the actual effect of effluent. Therefore, it is necessary to carry out backwashing after the application of quartz sand filters for a period of time. The actual duration is not fixed and must be determined based on the application situation.

The cleaning time of the multi material filter in the pure water system varies according to the characteristics of water resources. When the SDI is not satisfactory and the pressure difference is greater than 0.2, it should be cleaned. If the conductivity of the source water is within 200, it should be washed every three days. If the conductivity of the far water is above 300, it must be washed every two days. The time for each washing and backwashing is only 20 minutes.

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