Sometimes the city is changing a pipe upstream from you and that sends a lot of gunk into your filters if you happen to be running them at that time.
Hot water tanks pick up this sludge as well. Stays on the bottom. If you have a gas water heater, it sure won't run efficiently.
Next time the wife washes clothes, turn the hot water tank off. When she is finished, drain the tank. You will be surprised how much gunk will come out.
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