The Cal hypo scoop - is it volume or mass?

nabril15

Bronze Supporter
May 22, 2011
542
Miami, FL
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CircuPool RJ-45
Good morning
This is a dumb question, but it shall get asked.
Buckets of cal hypo or any chlorine come with a blue scoop that's marked with grams and ounces.
My brain tells me that those markings are volume and not mass. Right?

I ask because the poolcalc gives you the option of adding chemicals by weight or volume, and those 2 numbers are different.

Thanks
 

Texas Splash

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Jun 22, 2014
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Texas, San Antonio/Marion, South-Central Area
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That question comes up from time to time. A basic rule of thumb is to use Weight for solids and Volume for liquids. In most pool care cases though, an error encountered by using volume measurements for solids or vise-versa won't make a monumental difference, with the exception of a very large dosage which might cause problems. For example, I use the same measuring cup whether I'm adding granular stabilizer or muriatic acid. Like grenades, we just need to be close. :)
 
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