CISS-4G is the most efficient CISS cartridge.
The 4G works exactly same as the original HP Officejet Pro 8600/8100/6600's working system.
So, it makes possible the Head Cleaning Process of the original HP printers have. (Other cartridges can't do this.)
I'm telling you that it is only CISS-4G to make possible the process.
If you want to contact us,

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