How many liters does 20KG of salt make?
Hmmm, Let's see, how much does NSW cost me...It's about an 80 K round trip, so about $10 diesel, takes maybe 2 hours and I can get about 180 liters a trip. So that's $.18 per liter.
The salt, if it makes about 700 liters it's the same price per liter of water.
I think I have a couple 5 kg boxes that are good for a, iirc, about 200L each. So 20kg would be good for 800?