The recommended level of free available chlorine to keep in your pool is between 1.0. and 3.0 ppm or parts per million. For spas, the recommended level of free available. chlorine is between 1.50 and 3.0 ppm. (For the definition of parts per million and other pool- and spa-related terms, see the.
The tiny filtering units of kidney are the nephrons.there are millions of them in our body.they contain a number of network of tubes, cells and canals specialised in transmittâ¦ingThe kidney is responsible for maintaining fluid balance within the body. The basic structural and functional units of the kidneys are the nephrons.
The metric measure units of volume are based on the liter. 1  The milliliter (ml) is the smallest metric measure of volume and equals 1/1000 of a liter. 2  The centiliter (cl) is the next largest unit of volume and equals 1/100 of a liter. 3  The deciliter (dl) is the next largest unit of volume and equals 1/10 of a liter.