What is a "Skippy" filter ?

In our larger raised pond (still quite small) we have a Hozelok Ecoclear
2200 pump, filter and UV.

We also have a small pre-form which has two goldfish and some oxygenators,
and a small
(650gph) fountain pump in, and we'd like to filter that, but don't want to
go to the expense of the Hoselok system for something that small.

So could I use some other filter, eg Skippy ?

TIA

Peter