Calcium Hypochlorite, where to purchase, Europe (Food Grade)

So, on this forum I found this seller  lozzswellnessstore.co.uk/shop/herbal-remedies/mms2-calcium-hypochlorite-water-purification-60-capsules-500mg/

But anything else? Anything reliable? The true quality? 
Because as a newby I bought and used some sort of technical 30% and it wasn't pleasant. One granule and felt like I got poisoned lol, like I just lost a million brain cells.