FitMatch

The Melitta Latticia OT takes the Melitta PRO AQUA filter cartridge (part 6784658) as its water filter; replace it every 2 months; Australian sellers list it from A$23.00 as of 26 October 2026. Fitment confirmed against the manufacturer's compatibility list.

Your coffee machine

Confirmed against Melitta's list

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6784658

Takes the 6784658

Water filter · every 2 months · check the code on your old filter.

Other Melitta coffee machines that take the 6784658

Genuine

$23.00

Amazon AU · 26 Oct

Compatible

See seller

No compatible seller tracked yet

Genuine: made by Melitta. Compatible: another brand. Check certification on the seller's page.

Lowest price · $23.00

Amazon AU. Every seller we track is listed below. Some links earn us a commission.

Open Amazon AU

Other parts this coffee machine takes

Compare 3 listings from 2 sellers

AUD, before delivery. Each price shows when it was checked.

Amazon AUGenuine · checked 26 Oct$23.00Open
Amazon AUGenuine · checked 26 Oct$26.37 each3-pack $79.11Open
Di PacciGenuine · checked 29 Oct$42.95Open
Open cheapest seller · $23.00

Opens Amazon AU in a new tab. Their page is the source of truth for price, delivery and returns.

Not due yet?

Get a nudge when your water filter is due — it's every 2 months. One email two weeks before, no newsletter. Manage or stop it anytime.

Also saves the model to a FitMatch account under this address; the email signs you in, no password.

How to change the water filter in your Melitta Latticia OT

Watch the guide or follow the steps.

No clear video for this part yet. The steps cover it.

  1. 1Stand the new cartridge in a jug of fresh tap water for a few minutes.
  2. 2Display models (Barista, Passione, Varianza, CI Touch): open the menu, go to Care > Filter > Insert filter (or Change filter) and press Start.
  3. 3Button models (Purista, Latticia, Avanza): hold the Service or Water/Service button for 2 seconds and step to the Filter function.
  4. 4Follow the machine: empty the tank, screw the cartridge into the bottom of the tank, fill with fresh water and let the filter programme run.
  5. 5Change it every 2 months, or sooner when the machine asks.
Every number this part goes by
Retail name:
192830
Retail name:
4006508192830
Retail name:
6784658
Retail name:
Melitta Pro Aqua
Retail name:
Pro Aqua
Retail name:
PRO AQUA

Sellers list any of these; they are the same part.

About your Latticia OT

Melitta coffee machine — Latticia. Its water filter is the PRO AQUA filter cartridge, part 6784658, changed every 2 months.

Also in this coffee machine: Melitta ANTI CALC liquid descaler for automatic coffee machines 250 ml, Melitta PERFECT CLEAN cleaning tabs (4), Melitta PERFECT CLEAN milk system cleaner 250 ml.

Where the model number is: The model number is usually on a sticker on the underside or back of the machine.

Fits these 10 Melitta models
Common questions
Which water filter fits the Melitta Latticia OT?
The Melitta Latticia OT takes the Melitta PRO AQUA filter cartridge (part 6784658).
How often should I replace the water filter in my Melitta Latticia OT?
Every 2 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
Where can I buy the 6784658 in Australia?
We track 2 Australian sellers for the 6784658; the lowest listed price when we last checked was A$23.00 at Amazon AU. Prices are re-checked daily and dated on this page.
How do I fit the 6784658 in a Melitta Latticia OT?
No tools, a few minutes: 5 steps, listed on this page with the replacement video where the maker has one.
What happens if I don't change it?
The filter stops softening the water, scale builds in the boiler, and the machine asks to be descaled more often; taste in the cup drops off too.
How do I reset the filter light?
Register the new filter in the menu (Care > Filter > Insert filter or Change filter on display models; Service mode on button models). The Filter light then resets.

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