They can be combined (i.e. ChemiPure Elite) A few considerations...
- GFO and GAC usually become exhausted at different rates.
- GFO is usually tumbled to keep it from solidifying from calcium precipitation.
- Running both in reactors with the GAC downstream allows for the collection of GFO fines.
- If run passively, doubling the volume in a single filter bag may result in less flow through the bag.