The new reverse osmosis membrane elements are typically impregnated with 1% NaHSO3 and 18% aqueous glycerol solution and stored in sealed plastic bags. When the plastic bag is not broken, storage for about 1 year will not affect its life and performance. When the plastic bag is opened, it should be used as soon as possible to avoid adverse effects on the components due to oxidation of NaHSO3 in the air. Therefore, the membrane should be opened as much as possible before use.
After the reverse osmosis equipment test machine, we have used two methods to protect the film. The equipment is tested for two days (15~24h), and then maintained with 2% formaldehyde solution; or after 2~6h, it is maintained with 1% NaHSO3 aqueous solution (the air in the equipment pipeline should be drained to ensure the equipment) Do not leak, close all inlet and outlet valves). Both methods can achieve satisfactory results. The first method is more expensive, used when the idle time is long, and the second method is used when the idle time is short.