Humans and most other air-breathing animals require a constant source of fresh drinking water to excrete accumulated salts and metabolic waste products.
Some calcium salts are organic, some calcium salts are inorganic.
Urea , Uric acid and Creatinine are the major metabolic waste products thats correct
salts are made of cations and anions and are hence inorganic. Also there is no carbon involved in salts
Metabolic waste products include substances like urea, carbon dioxide, and excess salts produced during cellular processes. These waste products are removed from the body through processes such as urine excretion, respiration, and sweating.
Minor inorganic salts, such as iron, copper, and zinc, are essential for various biological processes in living organisms. These salts serve as cofactors for enzymes, which are crucial for metabolic reactions. They are also involved in maintaining osmotic balance, nerve function, and structural integrity of cells. Overall, minor inorganic salts play a vital role in the proper functioning of living organisms.
there are many inorganic salts. NaCl, KCl, CaCl2 etc....organic compounds contain carbon and hydrogen
Examples: organic or inorganic salts, basic or acidic salts, natural or artificial salts etc.
sweat
A compound must have carbon for it to be considered organic. You may come across the term zwitterions which are sometimes also called inner salts. They contain carbon but are not salts.
Metal salts that contain no carbon except as carbonate/bicarbonate.
Grey water, and I assume you mean non-sewerage waste water, will contain inorganic and organic compounds. Its composition will vary depending on what is being processed. typically expect salts and suspened food particles.