Fish tank filters (Clayton brook PR5)

2x “interpet cf1” filter units, 1 has unused filters & 1 requires filters. Compatible filters on Amazon are cheaper.
Perfect working condition, cost almost nothing to run & very efficient . The 3rd filter ( pic) is non replaceable as it’s “ceramic rings” for the growth of added friendly bacteria - so can be removed if not adding bacteria.
They simply hook onto top of tank