OIL SLUDGE .
CHANGE THE OIL! EVERY 3k miles. 3k miles is sooner than most auto mfgs. recommend.. the sooner the better. I have NEVER had a sludge issue with any car I have had the last 16 years. I...
This is a big open ended question. Is this for a waste water plant? I would start with a Google search for the water, waste water association for your state. If you have a more specific question,...
sludge is the stuff which you get off the impure copper (in a Copper sulphate solution) by using electrolysis. Sluge is amde up of precious metal e.g gold silver platinum!