> For the complete documentation index, see [llms.txt](https://help.sbtinstruments.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sbtinstruments.com/more/how-to-guides/replace-syringe-filter.md).
# Replace the syringe filter
Replace the 0.22 µm syringe filter on your dilution dispenser at the start of each day.
Your [dilution dispenser](/item-register/accessories/dilution-dispenser.md) dispenses through a 0.22 µm [syringe filter](/item-register/consumables/syringe-filter.md). Replace it at the start of each day, and sooner if it squeaks or you need to press harder to dispense. A filter typically clogs after 200–500 mL, or 20–50 dispenses of 10 mL.
## What you need
* A new 0.22 µm [syringe filter](/item-register/consumables/syringe-filter.md).
* An [empty vial](/item-register/individual-items/empty-vial.md).
## Step by step
{% stepper %}
{% step %}
#### Remove the old filter
Unscrew the old syringe filter from the Luer lock adapter on the ejection unit.
{% hint style="warning" %}
Be careful not to unscrew the Luer lock adapter itself from the ejection unit.
{% endhint %}
{% endstep %}
{% step %}
#### Fit the new filter
Screw the new syringe filter onto the Luer lock adapter.
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{% endstep %}
{% step %}
#### Check the volume
Dispense once and discard it. The first volume is often wrong. Dispense again and confirm that it fills the vial to the 10 mL mark.
{% endstep %}
{% endstepper %}
{% hint style="info" %}
Consult the included Hirschmann manual for details on operation, safety and troubleshooting.
{% endhint %}
---
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