How often should a grease trap be cleaned and maintained?

1.0 photo ImgBB https://imgbb.com How often should a grease trap be cleaned and maintained? https://ibb.co/mVsxQVWs https://i.ibb.co/9kXMRk5X/How-often-should-a-grease-trap-be-cleaned-and-maintained.png 1254 1254 greengenra https://greengenra.imgbb.com/ https://i.ibb.co/mVsxQVWs/How-often-should-a-grease-trap-be-cleaned-and-maintained.png 180 180