hey E ,
not a must have - but i'm pretty impressed w/ kool bloom , been using powder on my last grow at 1/2 strength . nice dense nugz , and huge dif. in intensity of smell = not always a good thing tho. lol . but my blueberry smells incredible . been vapin raw nugz right off the plant like popcorn . gonna harvest it all tomorrow .
just got a free pint of liquid kool bloom w/ my last hydro order too.
kevin at texas hydro rocks .
peace
your cuz
crispi