Dishwasher Leaving Grit on Dishes: Troubleshooting Guide (Troubleshooting Guide)

On this page

Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

Grit on dishes usually means dirty water or a clogged filter. Clean the filter, check the water inlet valve, and ensure proper water pressure. If the issue persists, test the water supply or replace the filter.

Confirm the symptom

Dishes have a gritty or sandy texture after washing
Grit is visible on plates, glasses, and cutlery
Problem persists after multiple wash cycles
Grit is not from food residue or hard water spots

Tools and prep

Screwdriver (if needed to access filter)
Clean cloth or sponge
Vinegar or dishwasher cleaner
Bucket (for water if filter is removed)
Gloves (to protect hands when handling dirty parts)
Turn off dishwasher power at circuit breaker
Shut off water supply if removing filter

Step-by-step troubleshooting

Inspect and Clean the Filter
Do: Locate the filter at the bottom of the dishwasher and remove it. Check for trapped grit or debris.
Observe: Filter is clogged with sand or grit.
Means: Clogged filter is the primary cause.
Next: Clean the filter thoroughly and reinstall it.
Rinse Filter and Interior
Do: Rinse the filter under running water. Wipe the dishwasher floor and spray arms with a damp cloth.
Observe: No visible grit on the filter or interior.
Means: Interior is clean and ready for testing.
Next: Run a test cycle with a dishwasher-safe vinegar solution.
Test Water Supply
Do: Check the water inlet valve for sediment. If possible, test water from a different source (e.g., garden hose).
Observe: Water contains grit or sediment.
Means: Contaminated water supply is the issue.
Next: Install a water filter or contact your local water provider.
Check Water Pressure
Do: Use a pressure gauge to measure water pressure at the inlet valve. Normal pressure is 20–120 psi.
Observe: Pressure is below 20 psi or fluctuates.
Means: Low water pressure is causing incomplete rinsing.
Next: Adjust or repair the water supply line.
Inspect Spray Arms
Do: Remove and examine the spray arms for clogs or damage.
Observe: Spray arms have blocked nozzles or cracks.
Means: Clogged or damaged spray arms prevent proper rinsing.
Next: Clean the nozzles or replace the spray arms.
Run a Descaling Cycle
Do: Use a commercial dishwasher descaler or a vinegar solution to remove mineral buildup.
Observe: Water runs clear after the cycle.
Means: Mineral deposits were contributing to grit.
Next: Resume normal use and monitor results.

Common causes

Cause	Likelihood	Difficulty	Part often needed
Clogged Filter Trapped grit in the filter circulates during wash cycles.	Common	Easy	Dishwasher Filter
Contaminated Water Supply Sediment in the water enters the dishwasher during filling.	Sometimes	Medium	Whole-House Water Filter
Low Water Pressure Inadequate pressure prevents thorough rinsing and drainage.	Sometimes	Medium	Pressure Regulator
Clogged Spray Arms Blocked nozzles reduce water coverage and leave grit behind.	Common	Easy–Medium	Spray Arm
Mineral Buildup Hard water deposits can trap grit and prevent proper cleaning.	Sometimes	Easy	Descaler or Water Softener
Faulty Drain Pump A malfunctioning pump may not fully drain grit from the system.	Rare	Hard	Drain Pump Assembly

Parts matching

Common parts needed to resolve grit on dishes:

Dishwasher Filter
Spray Arm
Water Filter Cartridge
Descaler Solution
Pressure Regulator
Drain Pump Assembly
Water Inlet Valve

Purchase OEM parts for compatibility and performance.

When to call a professional

Grit persists after cleaning all accessible parts
You suspect a water supply issue beyond your control
Low water pressure is due to a faulty pressure regulator
Drain pump or inlet valve shows signs of damage
You're unsure about electrical or plumbing repairs

FAQ

Can hard water cause grit on dishes?

Hard water can leave mineral deposits, but grit is usually from physical particles. Use a water softener if hard water is a recurring issue.

How often should I clean my dishwasher filter?

Clean the filter at least once a month to prevent buildup and maintain performance.

Will using vinegar help with grit on dishes?

Vinegar can help dissolve mineral deposits but won't remove grit. Clean the filter and check water quality for best results.

Can a clogged drain cause gritty dishes?

A partially clogged drain may allow grit to recirculate. Clean the drain and check for blockages.

Why do I still see grit after replacing the filter?

If the water supply is contaminated, grit may still enter the system. Test your water or install a filter.