Section 520 - Duties of employer1. Each employer shall keep such records and from time to time shall furnish such information as the retirement board in the discharge of its duties may require.2.a. Upon the employment of any teacher to whom this article may apply, he shall be informed by his employer of his duties and obligations in connection with the retirement system as a condition of his employment. Every teacher accepting employment shall be deemed to consent and agree to any deductions from his compensation required herein and to all other provisions of this article.b. Upon the employment of any teacher whose right to membership in the system has been made optional by the retirement board pursuant to subdivision two of section five hundred three of this article the employer shall inform such teacher in writing of the right to join the system. Each such teacher shall acknowledge the receipt of such notice by signing a copy thereof and filing it with such employer. Provided, however, the failure to inform such teacher shall not in any way be construed to waive the requirement that membership for such a teacher commences only when an application for membership is filed with the system nor shall it be construed to waive any of the eligibility requirements for previous service credit.3. Notwithstanding any other law, rule or regulation affecting the salary, pay, compensation, other prerequisites or tenure of any teacher to whom this article applies, or shall apply, and notwithstanding that the minimum salary, pay, compensation or other prerequisites, provided by law for such teacher shall be reduced thereby, payment less said deductions shall be a full and complete discharge and acquittance of all claims and demands whatsoever for service rendered by such member during the period covered by such payment.4. During September of each year, or at such other times as the retirement board shall approve, each employer shall certify to the retirement board the names of all teachers to whom this article applies.5. Each employer shall on the first day of each calendar month or at such less frequent intervals as the retirement board may approve, notify the retirement board of the employment of new teachers, removals, withdrawals and changes in salary of members that shall have occurred during the month preceding or the period covered since the last notification.