Aquamaxx just came out with a rollerfilter too. It looks to be a slightly better design of the BM. I'm toying with the idea of getting one. It would be interesting to see how it stacks up against the Clarisea.
https://www.marinedepot.com/aquamaxx-af-1-automatic-filter-roller
https://www.marinedepot.com/aquamaxx-af-1-automatic-filter-roller



