Epson EcoTank Expression ET-3700 Ink Bottles
Your EcoTank Expression ET-3700 uses the T502 ink bottles, featuring four individual colours for efficient home office management. We have been supplying replacement consumables for this printer since Nov 2017. Since black text is used more frequently than colour documents, the black ink bottle typically requires refilling earlier. Our 4.8 Google rating reflects a long-standing track record of premium cartridge performance.
Expected page output and replacement cycles
Page yields for these eco-friendly ink bottles are determined using the international ISO/IEC 24712 standard for inkjet systems. Because this model uses a high-capacity refill design, home office users experience an incredibly low cost-per-page and an extended printing volume before refills are needed.
| Cartridge Number | Type | Colour | Page Yield | Cost Per Page |
|---|---|---|---|---|
| T502 | Standard | Black | 7,500 | $0.005 |
| T502 | Standard | Cyan | 6,000 | $0.003 |
| T502 | Standard | Magenta | 6,000 | $0.003 |
| T502 | Standard | Yellow | 6,000 | $0.003 |
Cost Per Page = Total Cartridge Price ÷ Page Yield (at 5% coverage). Prices based on Genuine cartridges.
What to know about compatible ink bottles
Under Australian Consumer Law, using compatible cartridges does not void your printer warranty. Choosing third-party replacements offers a highly economical alternative to original bottles without sacrificing the clarity of your documents. You can read our detailed guide on genuine vs compatible cartridges to see how they compare.
Choosing the right bottle setup
If your daily printing consists mostly of administrative paperwork and text reports, securing a standalone black bottle is the most practical choice. For users who print colour handouts or regular mixed documents, multi-pack bundles ensure all reservoirs remain full at a lower total cost. All our compatible alternatives come backed by a complete money-back guarantee, and you can view our full terms on our Returns policy page. We ship directly from our national warehouses in Perth, Brisbane, Sydney, Melbourne and Adelaide. Free delivery applies on all orders over $99 (conditions apply). Find your replacement items fast via our main Epson ink bottles catalogue.
Pro Tip
When refilling the tanks, ensure you match the unique physical key on the tip of the T502 bottle with the corresponding slot on the printer to prevent any accidental colour mixing.
Frequently Asked Questions
Can I mix genuine Epson T502 bottles with compatible T502 bottles in the same printer?
Yes, you can safely mix genuine and compatible ink bottles within the reservoirs. The inks are fully compatible with each other and will blend without clogging the printhead mechanisms.
Why does my printer show an ink low warning when the bottle was completely emptied into the tank?
EcoTank printers do not actively read the physical fluid level inside the internal chambers. Instead, they calculate consumption mathematically based on page coverage, meaning you must manually reset the ink levels on the control panel after refilling.
What happens if I don't use the printer for a few weeks?
Because these ultra-high-yield systems hold a large volume of liquid ink, leaving the printer idle can cause micro-evaporation at the printhead nozzles. Running a quick nozzle check or cleaning cycle will easily clear any dried residue.
