Any public library which is a participating library in Connecticard and any library which was a participating library in Connecticard prior to July 1, 1983, may claim and be entitled to receive state aid for services rendered to nonresidents, provided such library files with the State Library Board a record of the number of items loaned to nonresidents of the town or towns which it normally serves not later than seven days after March first and September first of each year. Such reports shall be certified as accurate by the library filing with the State Library Board. On the order of the board, the Comptroller shall pay to each participating library an amount which shall be determined as follows: The State Library Board shall divide by two the total amount of funds appropriated for the Connecticard program. One-half of such amount shall be used for all Connecticard transactions and the remaining half shall be used for net plus transactions. The grant may be used for general library purposes and no portion of the grant money shall revert to the general fund of the town or towns normally served by such library.