I use a disposable tank and have a filter but didn't find it until the other day. I have batches without using the filter and don't have any off flavors but will use the filter for now on because I feel it is better to be safe than sorry.
And those filters are cheap so why not invest in one?
Heros are made 10 gallons at a time.
Kegged/On Tap - Double IPA
Conditioning - Orange Ale