I work in the swimming pool. Many swimmers have not used up their swimming cards last year, but they have expired. I still want to use them. I hope you can give me some advice.

As the staff of the swimming pool, you need to consider the setting of expired swimming supplementary cards and the rules for maintaining the swimming supplementary card system. The following are some possible suggestions and solutions for your reference:

1.** Remind swimmers of the card expiration time * *: Remind swimmers by email or SMS before the card expires. In this way, they will have enough time to use their swimming cards and avoid their expiration.

2.** Provide renewal service for the expired swimming supplementary card * *: If the swimmer's swimming supplementary card has expired, it can provide renewal service. This may require some administrative approval and adjustment of system settings, but it is very helpful for swimmers who forget to use expired supplementary cards.

3.** Set grace period * *: Swimmers can be allowed to continue to use their swimming supplementary cards for a certain period of time after the card expires. This can give swimmers who forget to use their supplementary cards a grace period so that they can use up their supplementary cards within the new period.

4.** Offer discounts or concessions * *: If the swimmer's swimming secondary card has expired, consider offering some discounts or concessions to encourage them to use the swimming pool again. This can not only increase the income of swimming pool, but also improve the satisfaction of swimmers.

5.** Communicate with swimmers to understand their needs * *: Sometimes, swimmers may have special needs, for example, they may find that they still have enough time to swim after their cards expire. In this case, you can consider communicating with them to find a solution.

The above suggestions need to be implemented according to the specific situation of the swimming pool. I hope these suggestions can help you.