Internal pressure is maintained to deliver the exact amount of ink that the original OEM cartridge would deliver. The cartridges used on our Continuous Ink Systems are sponge, feature a technology
patented check valve to maintain constant pressure without the need for priming and are constructed for prolonged, repeat uses (they are not modified single use disposables). Bulk Ink Systems are
constructed for professional digital printers, photographers, graphic designers and in general anyone that uses 2 or more sets of cartridges a month, they are easy to install, and will save you a
lot of money!