We have an Epson 4880 printer using Vivid Magenta [CCPRO-VM-350]. Yesterday I noticed the lack of magenta in a print, so I printed a Nozzle Check from the printer. Magenta was half blocked, but after several Clean Nozzle Head the magenta was soon completely blocked. We did some Power Cleanings and it did not help. I took out the Magenta Cartridge expecting a plugged hose, but instead I discovered what looked like murky ink. To be honest, we were not aware of the ink's requirement to be shaken every few weeks in order to increase its life, but if anything I would expect the ink to become separated due to density of the ink. However, the murky ink also appeared to have "bits" of sediment in the hose. I took a video of the ink running down the cartridge after I push the hose stopper in with a paperclip. I attached a video for reference.
Is this supposed to happen? I believe some of these "bits" are stuck in the lines and have clogged the magenta head, even after at least 6 Clean Nozzle Head flushes.