Calcium Hypochlorite 65% Granular

I have bought Jim's book and he advocates MMS2 as part of the breast cancer protocol.  I was just about to buy some online apcpure.com/product/calcium-hypochlorite-65-granular/ but then noticed that it says on the tub "harmful if swallowed". 

I just want to make sure I am buying the correct product.  I am in the UK.

Any guidance would be appreciated.  Also if this is a duplicate post, please forgive me - I thought I had posted but then couldn't find it so posted again.