I am having trouble agreeing with the volumes recommended by PoolMath, specifically for Calcium Chloride, Borax, and to a lesser extent CYA. Before PoolMath, I always added extra volume because I found that these chemicals are less dense than water, on which a fluid oz is based (1 oz mass water = 1 fluid oz volume). So am I missing a crucial step here - I am starting to think my numbers may be wrong.
Consider Clorox Calcium Hardness Increaser, from the manufacturer's MSDS sheet, it has a density of .749 g/ml
Now convert 1 pound mass of Calcium Chloride to an equivalent in fluid oz volume:
(1 lb) * (453.592 g/lb) / (.749 g/ml) / (29.5735 ml/fluid oz) = 20.478 fluid oz
So for Calcium chloride, you can assume 20.478 fluid oz / 16 oz mass or a conversion factor of 1.28............but PoolMath has a conversion of 0.8? This is confusing me.
Similar, 20 Mule Team borax has a density of 48 lb/ft3 or 0.769 g/ml. Doing the above math I get 19.945 fluid oz. per pound, or a conversion factor of 1.247, PoolMath's conversion is approximately 0.959.
For Clorox's CYA product with a density of 0.897 g/ml I had a conversion factor of 1.069, whereas PoolMath was 1.044.
Baking soda by PoolMath was exactly the same as my calculation using an average density of 1.201 from engineering toolbox's range 1.121 - 1.281 g/ml.
I did not check any other chemicals provided by the sheet.