A few pictures of my setups with constant drip for no water changes:
Dripping into tank.
Dripping into tank.

Dripping into tank.

Overflow from settlement chamber of sump, from above.

Overflow from settlement chamber of sump, from side. As seen next to backup pump.

Overflow from pump chamber of side wet and dry.

Large sump filled with pumice (my favourite).

Wet and dry with pumice and jap mat.

Ball valve and needle valve for fine control over drip rate.

Mains water and drain, ready for tank and sump.

Dripping into tank.

Dripping into tank.

Dripping into tank.

Overflow from settlement chamber of sump, from above.

Overflow from settlement chamber of sump, from side. As seen next to backup pump.

Overflow from pump chamber of side wet and dry.

Large sump filled with pumice (my favourite).

Wet and dry with pumice and jap mat.

Ball valve and needle valve for fine control over drip rate.

Mains water and drain, ready for tank and sump.
