We conducted extensive research into Epson ink cartridge volumes and found the volume of ink in the colour and black cartridges for the 73n model. The 73n Black and colour cartridges retails at $18.99 each which contain 7.4ml (black) and 5.5ml (colour) ink each.
Every time you refill the CISS (based on $54RRP for 4x100ml of our Premium Rihac refill inks) you are saving a further $1,238.27 or over 95%