How low should I allow ink to go before refilling? Do I have to use whole bottle during refill? How do I reset ink level in software for ET2550?

visually check the tank levels for each colour. The ink should be above the lower line on the tank casing. You do not have to use the whole bottle during refill but, because the ink quality will decrease once the ink is exposed to air, ensure that you screw the bottle lid down tightly, store upright and use the remaining ink as soon as possible. If you leave the refill task until the ink level is close to the lower line the tank will take the full bottle during refill.

Is this ink suitable for the eco tank et-4550 printer?

I think the only difference between 774 and 664 is the size. The 4550 printer has a large black ink capacity. If anything, the inks are the same- just the tops are different. I syringed the remaining ink from our 664 bottles when I replaced the printer with different eco tank model and put it into the printer tanks

Do i have to have "amazon dash replenishment " to buy this?

Don't know, but I don't have dash replenishment to buy it

can i use this on epson xp 304 please

Hello Paul, No these are only meant for the Ecotank that has refillable ink tanks. XP-304 has ink cartridges that are not refillable. Kind Regards.

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T6641 Black 70m Ink Bottle

Product ID: 48703656

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Details

Model name
T6641
Brand
Epson
Ink colour
Black
Page yield
6750
Compatible devices
Epson
Special feature
Ink Tank

📄Up to 6500 pages per bottle

🖤Genuine Epson ink for crisp prints

♻️EcoTank compatible for sustainable printing

Description

🖤 Print More, Stress Less — The Ink That Keeps Up With You

ECO TANK OPTIMIZED - Designed specifically for L355/L555 EcoTank printers for seamless performance.
COMPACT LIGHTWEIGHT - Sleek 100g bottle fits perfectly in your workspace without clutter.
RELIABLE CONSISTENT - Trusted Epson brand guarantees smooth ink flow and minimal downtime.
UNMATCHED PRINT VOLUME - Print up to 6500 pages per bottle—stay productive without constant refills.
AUTHENTIC EPSON QUALITY - Genuine ink ensures sharp, professional black prints every time.

This genuine Epson black ink bottle (model 235H549) is engineered for L355 and L555 EcoTank printers, delivering an impressive yield of approximately 6500 pages per bottle. Compact and lightweight, it ensures consistent, high-quality prints while supporting sustainable, refillable printing solutions.

Specifications

Manufacturer	Epson
Brand	Epson
Model Number	235H549
Product Dimensions	0.16 x 0.04 x 0.04 cm; 100 g
Batteries	1 Lithium Ion batteries required.
Colour	Black
Number of Items	1
Size	Standard
Sheet Size	A4
Ink Colour	Black
Manufacturer Part Number	235H549
Item Weight	100 g

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