As to the Sunray pool salt coming from Lake Grace Yabbies.... well it might.. as one of the sources...
But Cheetham uses natural sea water and lake brines to produce all of their "solar salts"... from 10 different solar salt fields... which are then refined in 3 major refineries throughout Australia ...
In other words... salt from the various sources... are all blended, mixed, refined.... at one of the three refineries...
P.S ... I couldn't find any reference that Cheetham uses salt from Lake Grace at all... they might... but it's not a primary source that they quote...
Cheetham salts are all manufactured to ISO standards... under full HACCP control....
http://www.ridley.com.au/Product/CheethamSalt.aspxThe only difference between the various "brands".... is generally the coarsness of the final product....
Some might have additional wash/filter stages...
But generally the suggestion in the "forum" linked to... should be taken with a grain of salt IMO....
The amount of salt... and any contamination... we introduce into our AP systems... is 1/5th of bugger all...
By the way... heres the MSDS.... which clearly shows... that "salts... are salts"...

...
http://www.aquasonic.com.au%2Fmsds%2Fso ... loride.pdf