Joseph DeMayo is absolutely correct on water quality.
I have clear canisters that hold the filter. I normally change the filter every 3-4 months. A few months ago, I noticed the filter was totally dark. I changed the filter and noticed within 10 days the filter was dark again. When I changed the filter again, I decided to flush the line before installing a new filter. A significant amount of backed up sludge came out before the line ran clear. I thought it was just me, but now I realize it is a water quality issue.
This needs to be addressed immediately before someone gets sick from this unacceptable water quality…