Filters are for collecting all the residue and dirt from your washing up.
Does your dishwasher smell bad? You probably need to clean your filter then.
Is your dishwasher not draining properly or have you noticed your dishes aren't coming out as clean as usual? Again, it is probably because the filter needs cleaning or replacing.
If your filter is broken or is faulty, replace it with a new one. Order your dishwasher filters from our site!