I bought a CISS system a number of years ago and installed it without reading the instructions completely. : )
It leaked and never worked properly.
Finally I went back, read the instructions ....completely...... and it works like a charm. LOL It took maybe 10 minutes to purge the ink.
Even with the cheap ink that came with it after all these years it still works.
BTW it came from cisinks.com
I have no association with these PPL but have certainly not been kind in the past about the brand or the systems in general.
Merry Xmas!