Refill instruction for black Canon PG-575 inkjet cartridges

The top of the PG-575 cartridges is a flat cover - on which the cartridge label is located. Under this label, approximately in the middle of the black cartridge, is the ventilation opening. It is used to equalize the pressure for the volume of ink used during printing. When refilling the PG-575 cartridges, this ventilation opening is used to access the inside of the cartridge. The label is carefully peeled off the cover until the central opening is clearly visible. We recommend only peeling off about two-thirds of the label; this makes it easier for you to position the label correctly after filling the printer with ink. The filling opening is at the end of the ventilation channel located under the label.

Use the cannula placed on the empty refill syringe to carefully widen the ventilation opening to the filling opening. To do this, carefully place the tip of the cannula into the vent opening. Use the syringe to carefully push the cannula into the vent opening while gently rotating the syringe. This will slowly widen the opening until the needle can slide inside the cartridge.

How much ink is used to refill a Canon PG-575 printer cartridge?
In their original state, the cartridges are filled with the following amounts of ink:
PG-575 - 5,6 ml / 100 pages print capacity
PG-575 XL - 15 ml / 400 pages print capacity
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The correct amount of refill ink for your empty Canon PG-575 cartridge depends on how much ink is left in the internal sponge after the empty message.

For Canon PG-575 cartridges, we recommend adding 4 to 5 ml of black pigmented refill ink into the refill syringe; for the PG-575 XL version with a larger ink sponge, the recommended amount is 10 to 12 ml.

Insert the needle attached to the refill syringe into the enlarged vent hole in the cartridge cover and prick the ink sponge. Please note to pierce in the direction of the rear cartridge area away from the print head area. Gently push the needle into the sponge until you hit the cartridge housing at the bottom - then pull the needle out again 1cm.
Now slowly pour the printer ink from the refill syringe into the ink sponge. The sponge is refilled from the bottom up thanks to the positioning of the cannula.
If the cartridge starts to drip from the print head nozzles while the ink is being filled, it can be assumed that the sponge is saturated (depending on the amount of residual ink remaining in the ink sponge / independent of the amount of ink remaining in the refill syringe). Now withdraw about 1 ml of ink from the cartridge again - the dripping will then usually stop.
After the desired amount of printer ink has been filled into the cartridge, the cartridge label is stuck back over the ventilation system. Make absolutely sure that one end of the duct system peeks out from under the label and is exposed. This is the only way to ensure that the cartridge interior is ventilated and that the ink volume in the cartridge used up by printing can be replaced by air flowing in.