I had to stop drinking Prill water again after getting loose bowels from it again. with my borderline low magnesium levels, loose bowels can really screw me up.
I was giving it to my 2 cats too and I think it caused them to get diarrhea that took a week of avoiding Prill to go away.
I use it on plants and I add it to dilute dish detergent and Dr Bronner's liquid soap. Seems to work good on this. They sell a 2 pound Prill sack to wash clothes in. I add it to my birdbath - seems to get the birds wetter better. :-)