Between August 1-10 this year the Napier Aquatic Centre sold 13 10-visit Gold Card concession cards and 12 single admission Gold Card entries.
Since Krueger and Newman made their contribution, sales from September 1-10 saw 40 10-visit Gold Card Concession Cards and 90 single admission gold card entries sold.
The couple have a special connection to Napier and spend January and February there each year.
They wanted to use some of their retirement money to do something for their adopted country.
The subsidy for senior swimmers is the latest initiative they have put their money towards.
Others include efforts to save kiwi via Cape, restoration of the old Napier Cemetery on Napier Hill, and upkeep of Napier's Botanical Gardens.
The initiative has brightened the day of many Gold Card holders, with one pool user writing in to the Aquatic Centre expressing her gratitude.
The 80-year-old woman, who suffers from arthritis, uses the pool five days a week and wrote to express her "appreciation for the kind gift."
She said due to daily use of the swimming pool, it enabled her to continue daily care.
"Our seniors are an important part of our community, and thanks to the kind support of Philip and Judith, we can remove a key barrier for our seniors to be more active within our aquatic centre," Lucas said.