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This post was last edited by Qingfeng Xuchi on 2022-3-10 at 10:37. Polishing resins are generally used at the end of ultra-pure water treatment systems to ensure that the quality of the water output from the system meets the required standards. Generally, the resistivity of the effluent water can reach over 18.25 MΩ, and there is also a certain level of control over TOC and SiO2. Tulsimer polishing resins can achieve TOC levels of <5ppb and silica levels of <10ppb; the resin models are MB-106up & MB-115. The ionic forms of these polishing resins are H and OH types. They can be used directly after being filled in, without the need for regeneration, and are typically used in the semiconductor industry. When filling the polishing resin in ultra-pure water equipment, the following points should be noted: 1. The polishing resin is composed of hydrogen-type strongly acidic cation exchange resin and hydroxide-type strongly basic anion exchange resin. 2. During the operation, if water needs to be added to facilitate filling, pure water must be used, and the amount of water should not be excessive. Additionally, the water must be removed or drained as soon as the resin enters the resin tank, in order to prevent stratification of the resin. 3. If resin is to be filled by hand, be sure to wash your hands thoroughly; do not allow any grease to enter the resin tank. 4. If resins are to be replaced, the tank and collector must be thoroughly cleaned; no residual old resins should remain at the bottom of the tank, as such used resins will contaminate the water quality. 5. The O-ring seals used must be replaced regularly. At the same time, relevant components must be checked every time a change is made; if any are damaged, they must be replaced immediately. Check the collector; if it is clogged, it should be cleared. 6. When using an FRP tank (fiber-reinforced composite plastic) as the resin bed, the water collection pipes (central pipe and distributor) should be placed in the tank first before filling it with resin. During the resin filling process, the water collection pipe should be shaken from time to time; only at the end should its position be adjusted and the cover installed. 7. If resin is filled first, it will be difficult to insert the water collection pipe. If it is necessary to fill the resin first before inserting the collector pipe, the FRP tank filled with resin can be placed horizontally on the ground; the tank can then be rolled slowly to loosen the resin, after which the collector pipe can be inserted into the resin gradually. 8. After the resin has been filled and the pipelines connected, the vent hole at the top of the tank should be opened first. Water should be introduced slowly until water starts to flow out of the vent hole and no more bubbles appear; once this occurs, the vent hole should be closed tightly, and water extraction can begin. If the produced water becomes unstable after filling is complete, it is possible to check the cleanliness of the pipeline connections or the airtightness of the nitrogen seal tank.