Epson EcoTank Expression ET-2500 ET-2550 Ink Bottles
Your Epson EcoTank Expression ET-2500 ET-2550 uses the T664 ink bottles. We have been supplying these continuous ultra-high-yield fluid refills since Nov 2016. Instead of physical microchips found in old cartridges, this four-colour system relies on direct liquid replenishment, meaning replacements are determined purely by visual level monitoring. Our 4.8 Google rating reflects a long-standing track record of premium cartridge performance.
Real-world fluid life and page output
Epson calculates these T664 fills using the international ISO/IEC 24711 standard for continuous inkjet systems. Because this is an continuous tank setup, individual colour usage fluctuates based on graphics tasks rather than static cycles, meaning real world intervals stretch much longer than traditional desktop options.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| C13T664192 | Standard | Black | 4,000 | $0.004 |
| C13T664292 | Standard | Cyan | 6,500 | $0.002 |
| C13T664392 | Standard | Magenta | 6,500 | $0.002 |
| C13T664492 | Standard | Yellow | 6,500 | $0.002 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
Managing your tank refills
If you primarily print monochrome letters or school documents, the black bottle will deplete first, but leaving colour reservoirs empty can cause air blocks in the ink delivery lines. Users printing mixed general documents save significantly by purchasing complete multipacks. When buying replacements to reduce costs, our compatible bottles provide a worry-free alternative backed by a full money-back guarantee. Standard shipping originates from our national transit hubs in Perth, Brisbane, Sydney, Melbourne, and Adelaide. Free delivery applies on all orders over $99 (conditions apply). Secure your replacement stock via our dedicated Epson ink bottles store page. You can read more about how our stock performs by reviewing our Returns policy.
What to know about compatible T664 bottles
Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Third-party T664 refill bottles are physically shaped to pour smoothly into the integrated EcoTank reservoirs and use specifically formulated liquid ink that matches original properties. For a thorough breakdown of physical characteristics, read our guide on genuine vs compatible cartridges.
Pro Tip
Never let the liquid level in any EcoTank reservoir fall below the lower limit line marked on the outside of the printer chassis; drawing air into the printhead pipelines requires a deep ink flushing cycle that consumes large amounts of fluid to clear.
Frequently Asked Questions
Can I mix genuine Epson T664 ink with compatible T664 fluids inside the same tank?
Yes, you can safely pour compatible T664 ink into a reservoir that still contains original fluid. The two ink formulas are chemically miscible and will blend smoothly without coagulation, meaning you do not have to wait for a tank to be completely dry before topping it up.
Why does my print quality drop even though the EcoTank windows show the tanks are full?
Unlike traditional cartridges, this printer has no electronic internal sensors to read liquid volume. If you do not manually reset the ink levels via the printer control panel after pouring in a fresh T664 bottle, the printer logic may mistakenly assume the system is running dry and restrict ink delivery performance.
Do these T664 bottles expire if I store them for a long time before refilling?
Epson T664 bottles feature airtight vacuum seals that give them a shelf life of up to two years. Keep them stored upright in a cool, dark space because exposure to direct sunlight or high temperatures can alter the fluid viscosity and lead to printhead nozzle clogging.
