The easy2grow Extension Kit other wise known as the 2Pot Extension Kit is simply added onto the easy2grow kit to extend the system. The extension Kit is supplied with the following;

1x 2Pot tray & lid
2x 8.5ltr pots
2x Marix discs - the Marix discs are
  placed inside each of the pots to
  prevent soil/compost from leaving
  the pots
2x Root Control Discs - the RCD's
  are placed in the tray under each
  pot, gold face up. The RCD's will
  prevent roots from leaving the
  pots and discourage them from
  heading towards the AQUAvalve.