Upon opening my pool for the season today, I discovered that a family of mice thought my FNS Plus filter would be a great place to spend the winter (removed remnants of their nest). They also thought it would be swell to chew the fabric of one of the DE Grid's. I'm currently running it without DE while I ponder my options. The filter is 4 years old. I would appreciate input as to whether I should replace the single damaged grid($), replace all of the grids($$) or replace the entire assembly($$$).
Looking forward to your comments,