skimmer boxes can be built into the walls of a concrete pond.
But can be used with a pond liner and the special kit to secure
the skimmer box is an optional extra - see below.
Please note that a skimmer also
requires to be connected to a filtration unit of some sort...
The Hidroclean is highly
recommended for this purpose and is easy to fit ...and an ideal
pump for this system would be the Oase Aquamax ...used as a dry
surface pump and not as a submersible...