The problem with technical grade (being the lowest grade ) is you could never know what and how much impurities are present. Pwedeng ammonia pala ang present or worse, metals and other residues or salts that can be harmful for corals.
Maraming grades see here :
www.reagents.com/products/reagents/grades.htmlUsually dito sa atin, USP, Food Grade, Analytical, Technical at Industrial grades ang available. If I remember correctky, TG and IG are used interchangeably depende kung anong chemical ang binili mo.
Anyway, try to pm Nes (naivete) and ask if he still sells CaCl. Pagkaalam ko kasi meron sa Sytengco dati. FG pa.