Hi peeps
I realise that its been a while but thought you all might be interested in a recent article by Practical fish keeping (a very popular aquatic magazine in the u.k)
5 salts were tested, these being D-D H2O,Reef crystals,Tunze,Tetra and Red sea coral pro.
The salts were tested by an accredited laboratory and D-D was found to have a formula that was closest to Natural sea water with no additives needed to buffer the salt.
Further reading can be found here although the full article is only available in the magazine which may not be available in Canada.
http://www.theaquariumsolution.com/h...ines-best-test
All the best Tony