---
title: "Cleaning a Thermador Dishwasher Filter, and Descaling for Miami Water"
description: "How to remove and wash the filter in a Thermador dishwasher, how often on hard Miami-Dade water, and how to descale properly — including why vinegar is the wrong tool"
url: "https://thermadormiami.support/blog/cleaning-a-thermador-dishwasher-filter/"
date_modified: "2026-08-18"
Category: "Maintenance & Prevention"
---


# Cleaning a Thermador Dishwasher Filter, and Descaling for Miami Water

## The filter, in two minutes

At the bottom of the tub there is a cylindrical filter in a flat mesh plate.

- **Twist the cylinder counter-clockwise** and lift it out. No tools.- **Lift out the flat plate** underneath it.- **Rinse both under the faucet** with a soft brush. Look at what comes off — seeds, labels, grease — because that is what has been recirculating over your dishes.- **Refit** and turn the cylinder until it locks. It should not spin freely afterwards.

While the plate is out, look into the sump. A drain pump cover sits alongside it; anything obvious in there comes out by hand.

**This is the answer more often than the pump.** A blocked filter stops water leaving and stops dishes getting clean, and both of those are jobs people book visits for. [The full drain symptom page](/symptoms/dishwasher-not-draining/) works through the rest of the path — hose, high loop, air gap, and a disposal knockout plug that was never punched out.

## Descaling, which is a separate job

Miami-Dade water is hard. This platform takes that seriously enough to publish a code for limescale in the heat pump — the machine tells you when the water has been doing what the water here does.

**Use a purpose-made dishwasher descaler**, on an empty machine, on the hottest cycle it has. Follow the product rather than the internet: dosing matters and more is not better.

**Two to four times a year** on this water, on a machine used most days.

**Not vinegar.** It is acidic enough to work on seals and stainless over months, and you will be doing this regularly. It is a poor trade for a job a proper product does better.

## The setting almost nobody sets

These machines have a **water hardness setting** that controls how much softening salt they use. It is meant to be set at installation against the local supply, and on a great many machines in this city it was never set at all.

The symptoms of leaving it wrong are not dramatic and they are constant: filmed glassware, detergent that seems weaker than it should be, and scale building faster than it needs to. Setting it — and keeping salt in the reservoir — changes the result more than any single part on this page.

## Why scale is worth taking seriously on this brand

On most dishwashers, scale means a slow decline in performance. On the models with a mineral drying chamber it eventually reaches an assembly that is [the most expensive dishwasher repair on this site](/repair-cost/dishwasher-drying-repair/).

That is the actual argument for a $155 maintenance habit: not tidiness, but the row further down the price list that it prevents.

## The monthly rhythm that keeps a machine out of trouble

- **Filter:** monthly, two minutes- **Spray arms:** spin them by hand, hold them to the light, clear the jets with a pin- **Door seal:** wipe the folds, particularly the bottom corners- **Rinse aid and salt:** top both up- **Descaler:** quarterly on this water

That is fifteen minutes, four times a year, and it is most of what we would do on a maintenance visit for the dishwasher. [What a maintenance visit covers across the kitchen](/services/appliance-maintenance/) if you would rather have all of it done at once.

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**[Read full article: Cleaning a Thermador Dishwasher Filter, and Descaling for Miami Water](https://thermadormiami.support/blog/cleaning-a-thermador-dishwasher-filter/)**