The organic matter have the limit in water that is about __________
(a) 0.2 to 1
(b) 0.5 to 1
(c) 1 to 2
(d) 2 to 4
The question was posed to me during an interview for a job.
Question is taken from Reverse Osmosis, Ultrafilteration, COD and BOD topic in portion Water of Applied Chemistry