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After a long time of use, the filter element should be replaced. When the length of the filter element we want to replace is insufficient, it can be solved by adding a rubber pad. Also pay attention to the filter element when placing the filter element. Do not harden it when screwing the filter bottle. Unscrew the filter bottle to re-align the filter element to avoid damage to the filter element. After the filter element is installed, it must be rinsed before it can be connected to the back system. The general flushing time should be more than 5 minutes. In fact, there is still a problem. Whe