My pool is 15K g in-ground pool, I recently open the filter (Anthony VA) to clean because I got dust coming back into the pool. Turn out there are anout 3-4 grid got hole in it so I need to replace those. I have not clean the filter for a while, back wash I do it regularly. I'm thinking while I'm at it, just replace the whole set which will come out about ~$170, while the new filter is about $425 (Hayward Perflex EC65A DE Swimming Pool Filter). I need your advice, should I just replace the grid (the old filter is about > 6-8 years), or buy the whole new one. Another question is the EC65A is enough for my pool? Thanks.