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Electrolux PLD2850RDC2 or Frigidaire PLD2850RDC2 dishwasher. Stainless steel door with plastic tub.

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Why is black grit all over dishes after wash?

Black grit in dishwasher.

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When the dishwasher does not clean properly, the high temperature at which the dishes are dried burns the food residue on the dishes. This forms grit or dust like particles on the items washed. The appearance of grit on your dishes may also occur because of short wash cycles, low water temperature, and use of poor quality dishwasher detergent.

Try the following dishwasher maintenance steps:

Clean the dishwasher filter of any food residue and debris

Ensure that you use the right amount and type of detergent as described in the appliance manual

Do not use the quick cycle if there are a lot of items to be washed

Load the dishwasher correctly, placing the items at the right levels in the dishwasher

Ensure that nothing is blocking the dishwasher spray arms

Also, check that the dishwasher spray arms are clear and clean

Do not connect the dishwasher to hot supply unless it is clearly marked as suitable for use. Running the dishwasher with hot water will shorten the wash cycle, causing the detergent to decompose too early and give poor wash results.

Run the regular cycle and do not add items in the midst of a wash cycle. If the problem of the dishwasher leaving grit persists there could be a fault with the main recirculation pump. Most dishwashers take in cold water and heat the water to a higher temperature. A heating fault with the dishwasher will also result in poorly cleaned dishes. It is advisable to call the appliance technician for further troubleshooting.

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Sounds like food particles. First check the inside for any remaining food that didn't go through the filter and if you have a removable filter make sure its clean.

You may want to check the discharge hose. Take it off and run some water through it. And lastly check your disposal units connection and make sure you've run enough water through to clear away any material in it.

The other side of the issue is the water supply: If you have a well you maybe getting sand in the water check your well pump and water tank.

You may want to install a grit filter in the main water line even if the water is supplied by the city or town.

Run the dishwater with no dishes to hopefully finish flushing any stuff out of the lines.

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