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Instead of guessing how much ammonia you need, here's a simple formula for working out the exact quantity: volume = (ppm * litres * 0.1) / percent Where: ppm is the concentration of ammonia you want (as reported by a test kit); litres is the capacity of the tank; percent is the...

Here's a simple formula for working out roughly the number of drops of ammonia you need to get a particular ppm in your tank: drops = (ppm * litres) / (percent * 0.5) Where: ppm is the concentration of ammonia you want (as reported by a test kit); litres is the capacity of the tank...