Just looked and our unit is ARKSEN
This one on Amazon looks exactly like ours except only 1 filter, ours has 2.
and the price is about what I remember
I see there are a lot of companies selling these under different brand names. I did notice that ours has 2 slots and 2 filters, the one in this picture only has one.
found the exact one we have at Amazon, currently unavailable, but there are lots of others