The aerators on your faucet/ shower head are strainers and are used to break up the flow of water as it leaves your faucet/shower head. These screens can collect particles overtime that are found in water and should be routinely cleaned and replaced.
The common source of buildup on the aerators is from the hot water heater; it can either be from the hot water heaters non-toxic plastic dip tube disintegrating or from naturally occurring dissolved calcium in the water which turns into calcium carbonate in your hot water heater.
If you place the particles in distilled vinegar and the white particles begin to "bubble" within a few minutes and mostly dissolves within 24 hours, it is likely calcium carbonate. If the white particles do not bubble and does not dissolve, it is likely plastic.
If you discover that it is calcium carbonate, we recommend flushing the hot water heater, which should be done annually to prevent build up as a regular maintenance program. Contact a plumber or follow your manufacturer suggestions to flush.
If you discover that it is plastic, call the manufacturer of your hot water heater, or read your user manual to trouble shoot this.
If you have checked the dip tube, flushed the water heater, cleaned the aerators and flushed you’re water by running it for 5 minutes on cold, and the issue still persists please contact the Water Quality Assurance Laboratory at 321-433-8709.