a combination of phlegm, toothpaste, soap residue, hair, and other debris builds up inside the pipes. Whether they are PVC, copper, or cast iron pipes, there are several ways to clear the sludge and resolve your bathroom sink issues
The manganese level in a building water supply may be made more apparent (as black sludge or deposits or as dark or black stains on laundry) when acidic, manganese-bearing water interacts with organic matter that is also in the water supply. Thus we're more likely to see higher levels ...