This chapter provides an optional provision for the redemption, on an installment plan, of property sold to the district for delinquent assessments. The board may at any time, by resolution, elect to permit the redemption of property sold to the district for delinquent assessments according to the provisions of this chapter. The board may at any time thereafter, by further resolution, terminate such election, but no such termination shall affect a redemption plan then in effect.