Metric really is nice: 1 liter of water weighs 1 kg and measures 10cm on
a side.

Carolyn LeCrone wrote:

How can you have mg per liter, when mg is weight and l is volume?
Carolyn
"Matt Rosing" wrote in message
...


Well, sort of. ppm stands for parts per million. There are a million
milligrams of water in 1 liter (=1000 grams at standard blah blah blah).
But going from dry units to liquid isn't the same. I did a search on
cloram-x and found something that said 5 lbs treats 18,794 gallons (or
about 1/4 lb / 1000 gallons). Maybe that helps?