Coat stains with lemon juice and Borax paste. Toxics are an invisible but serious threat to human and environmental health. A substance is toxic if it can kill or harm the health of people or other living things. You often can't see, smell, or taste toxic pollution. Very small amounts of some toxins, like copper, can harm the growth and reproduction of fish and wildlife.
Larger amounts can harm people.
Than Cures Once toxins are mixed in water, they can be very difficult and expensive to remove. Point Source Pollution is pollution that can be traced back to specific sources. Municipal wastewater treatment plants are one of the most common examples of treatment of point sources. Industries that dump industrial wastes. Combined sewer outfalls.