1. Buy a new swimming card again: because it is an bearer card, there is no information related to you on the card, and it cannot be retrieved after it is lost. Therefore, you need to buy a new card.
2. Save the consumption receipt: if you have a consumption receipt at ordinary times, you can save it. Once the bearer swimming card is lost, you can take these consumer receipts and other evidence to the merchant to negotiate a solution to reissue the card or refund the balance.
The above suggestions are for reference only, and the specific solutions may be different according to the regulations of the merchants. I suggest you contact the merchant to get the most accurate information.