# Replace syringe filter

This page teaches you how to replace the [syringe filter](https://help.sbtinstruments.com/encyclopedia/item-register/consumables/syringe-filter) on your [dilution dispenser](https://help.sbtinstruments.com/encyclopedia/item-register/accessories/dilution-dispenser).

{% hint style="success" %}

### [**Replace the syringe filter**](https://help.sbtinstruments.com/protocols/do-it-yourself-diy/assemble-dilution-dispenser/replace-syringe-filter) **at the start of each day**

Even within a single day, the syringe filter clogs after repeated use. If it feels like you need to press harder to dispense, replace the syringe filter.

Each syringe filter typically clogs after 200–500 mL of liquid dispensed (20–50 dispenses of 10 mL).
{% endhint %}

{% hint style="warning" %}

### **Indications of clogged syringe filter**

A squeaking sound may indicate a clogged syringe filter. [Replace the syringe filter](https://help.sbtinstruments.com/protocols/do-it-yourself-diy/assemble-dilution-dispenser/replace-syringe-filter) if squeaking occurs to maintain accurate and fluent dispensing.
{% endhint %}

## Quick clip :zap:

<figure><img src="https://4216107837-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeYTtd7c0A325muFr5lMW%2Fuploads%2FINxlWvWom7qJtYij7JTn%2FReplace_syringe_filter.avif?alt=media&#x26;token=46c5500b-c58d-4b06-b008-d04df397892b" alt="" width="375"><figcaption></figcaption></figure>

## Get things ready

You need these items:

* 1 × [dilution dispenser](https://help.sbtinstruments.com/encyclopedia/item-register/accessories/dilution-dispenser) (see [assemble-dilution-dispenser](https://help.sbtinstruments.com/protocols/do-it-yourself-diy/assemble-dilution-dispenser/assemble-dilution-dispenser "mention"))
* 1 × [syringe filter](https://help.sbtinstruments.com/encyclopedia/item-register/consumables/syringe-filter)
* 1 × [empty vial](https://help.sbtinstruments.com/encyclopedia/item-register/vials-flasks-and-liquids/empty-vial)

## Step by step

{% stepper %}
{% step %}

### Uninstall old syringe filter

Unscrew the old syringe filter from the Luer lock adapter on the ejection unit.

<figure><img src="https://4216107837-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeYTtd7c0A325muFr5lMW%2Fuploads%2F7sEBhIhOuasHpo51IRdq%2Fsyringe%20filter%20removed.JPG?alt=media&#x26;token=c176c6b8-9561-449b-8f2e-78ae5a8261b1" alt="" width="188"><figcaption></figcaption></figure>

{% hint style="warning" %}
Be careful not to unscrew the Luer lock adapter itself from the ejection unit.
{% endhint %}
{% endstep %}

{% step %}

### Install new syringe filter

Screw the new syringe filter onto the Luer lock adapter on the ejection unit.

![](https://4216107837-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeYTtd7c0A325muFr5lMW%2Fuploads%2FqdeJ3Bvu1G6MBScY45dy%2Fsyringe%20filter%20on%20ejection%20unit.JPG?alt=media\&token=4aaa2638-026d-4251-b417-dcda505d391c)
{% endstep %}

{% step %}

### Confirm volume

Dispense once and discard it. The volume is often wrong on the first dispense.

Dispense a second time. Confirm that it fills the vial to the 10 mL mark.

![](https://4216107837-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeYTtd7c0A325muFr5lMW%2Fuploads%2Fvix9qxGxVZRLrTIznKDs%2Flevel%20check.JPG?alt=media\&token=031ee857-6a43-4a7b-bdab-18eb466a559f)
{% endstep %}

{% step %}

### That is it!

Remember to replace the syringe filter at the start of each day.
{% endstep %}
{% endstepper %}

{% hint style="info" %}
Consult the included Hirschmann manual for comprehensive details on operation, safety, and troubleshooting.
{% endhint %}


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