I wouldn't use that, here's a link to the MSDS, it's only 11% laclhere is a cheep source of lanthanum chloride it is used for pools. And this is a Canadian source,
https://www.poolsuppliescanada.ca/natural-chemistry-phosfree-2-litre.html
2l jug $35.70 enough to dose 10 000 gal @ 1.2 ppm Phos
Good to know.I use seaklear because it's tried and tested.
Many on rc have been using it for years with no ill effects if administered properly