If you suspect your gray ice stems back to a fridge filter issue, that’s where you should look next. Most filter-related grey ice problems happen because a fresh filter has been installed but not flushed. New carbon filters in fridges often give off small amounts of carbon particles for a while, leading to gray ice cubes. Solve the problem by running 2 to 3 gallons of water through your filter via your fridge’s water dispenser. This is known as “flushing” the filter. It should be enough to wash away all the loose carbon particulate in your new filter. If your fridge doesn’t have a water dispenser, dispose of the first couple of batches of ice after filter replacement.