Using media from established tank but no nitrates

[StevenF]

10 ppm means 10 grams in 1,000,000 grams water = 1,000,000 ml water.
1,000,000 ml water = 1,000 litres.
So 10 ppm means 10 grams in 1000 litres.
Or 1 gram in 100 litres
or 0.5 grams in 50 litres

Just a note this is not quite right. 10PPM is 10 miligrams in one liter of water or 0.010 grams in 1 liter of water. Since there are 1,000,000 miligrams in one liter of water 1 miligram in one liter of water is one part per million.

 

[Essjay]

Or 1 gram in 100 litres

1 g in 100 litres = 0.1 g in 10 litres = 0.01 g in 1 litre.
0.01 g = 10 mg
10 ppm = 10 mg/l which is the same as 1 ppm = 1 mg/l

That's the same as what you said