Hi Folks,
My name is Chris Brooks and I am the owner of Promax Imaging. I would firstly like to thank you all for the good things you have said about us.
I came upon this blog by accident while searching for something else, but I was very interested in what had been said. I would like to clarify a couple of points and give some advice.
With refilled cartridges it is partially true that there can be an air bubble that migrates to the head, but that does depend upon the technique used to refill the cartridge. I am afraid that most refilled cartridges fall into this category. That is because most methods employed to refill the cartridge saturate the top of the sponge (no dry patch on top like the OEM). This can cause ink migration away from the head when the tank part of the cartridge becomes empty allowing air to enter the head.
Also, most refillers do not properly clean the cartridge before refilling, this can cause compatibility problems between the two inks leading to irregular ink flow through the cartridge delivery medium, or worse still, a printhead blockage. It is impossible to get the correct amount of ink into the cartridge unless it has been properly cleaned, or for the ink to disperse correctly in the sponge.
We will shortly have a detailed technical infomation sheet available on our website for these Canon cartridges explaining all these and other issues. Visit our website on www.promaximaging.com.
CISS systems can work very well. If you intend to get one, ensure you obtain one that has see through cartridges. This is very important as you can actually see the ink levels in the cartridge. If they get too low you can bleed out the air easily.
Whilst incorrect initial charging of the ciss system does lead to excess air in the cartridge, you will always see occasional air bubbles in the lines, no matter what ink you are using.
This is caused by disolved gases in the ink coming out of solution, exactly the same way as cola fizzes. It happens with all inks, including OEM ink. This is caused by the weather (atmospheric pressure varience), equally, they can also disappear by disolving back into the ink. That is why there is a bubble breaker screen in the delivery nozzle of the cartridge, or on top of the printhead. It is a very fine stainless steel mesh. It is often mistaken as being a filter. While it does perform that task, it's primary function is to allow fluid to pass, but not allow minute air bubbles to pass.
I hope this sheds a bit of light on the subject. Incidentally, we do not sell CISS systems at present.