Quote Originally Posted by hamop78 View Post
Richard,
I bought 4 cases (3 X 182 oz jug) of Clorox Ultra last weekend at Sam's --- the price worked out to 1.0333 cents per oz. I tested the product using the .1ml per 1L distilled water and got 6.8% using FAS-DPD w/25ml sample size. This reflects a higher percentage than they claim on their MSDS. I test every batch I buy. If I get a low batch --- Back it goes .
Just so you know, and now that we have all the terminology to get hopelessly confused, the 6.8% that you determined through the "volume" method is a "Trade %" since the FAS-DPD test measures ppm of chlorine as "available chlorine as ppm chlorine gas" and "Trade %" is "available chlorine as ppm chlorine gas per 100 ml".

The "Weight % Sodium Hypochlorite" is 6.5% and is within the range on the MSDS of 6-7.35% (which is a hell of a range!). You can convert from "Trade %" (i.e. your test measurement) to "Weight % Sodium Hypochlorite" by multiplying by 74.4422/70.906 = 1.05 and dividing by the specific gravity (density) of the liquid which is 1.1 for Clorox Ultra.

When comparing prices, you can factor the price per ounce by dividing by the "Trade %" (and multiplying by 100 for a reasonable scale) so in your case that is 15.2 while my source is 15.6 so is fairly close in price for what we are getting (though I carry less weight ).

Richard