Yes you can but do not pack too much filter wool and ensure the media basket are seated properly or the water you intend to filter would be bypass by the gap. Remember to remove the impeller from the 2028 too!
Or, if you have not bought the 2028 yet, a 2nd hand 2215 or 2217 might be an alternative model to look into. Stuff some cheap filter wool between the 2 media plate and you're good to go! I am using a 2217 in such configuration previously to vacuum my marine display tank and sump.
Hope this helps!
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