Idea: 1, through the operation to crack the card terminal of ic card, only the charge is replenished, but the water is discharged. 2. Invade the card system and tamper with the ic card database.

Analysis: Generally, the first method is simple and easy to operate, while the second method is high in technology but strong in concealment.

Operation: write down the brand and model of the water saver, go to the website to inquire about the relevant user manual, and crack the corresponding operation after the principle. Methods Baidu has relevant information, which can be solved according to the specific situation, generally physical cracking.

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