Just a lil update.
Well at first i thought i'd dropped a right bollcks

cos after watering i returned the next day to find

SEVERE burns,like u would expect if u poured a strong acid on your lovely girls/boys.....which is exactly what happened!

I used by accident the remains of some water at the bottom of my can that was for sterilization!

So yes,the products do no harm at least[so long as you don't mix em up with h202].
Pretty pissed really cos 2 jillybeans,2sensistars,1 vortex and some g13hybrids all burnt,only the top shoots and a few side shoots remain,fan leaves are dust.
Will still buy the normal stuff,but if u can't get it for any reason then vinegar/lemon for organic and pond ph[not as strong as nitric or phosphurous[?] down for hydro works great.
so check out them pet shops for some cool products.