Don't do H2O, but if you're getting Canna nutes then you must be using TX Hydro. I highly recommend Brite Ideas on S. Congress. Better selection, better prices, better people, and they give you steady discounts once you're a regular. Just my 2 cents, but at least check em out if you haven't yet. Troy's a good guy, and everything he sells is backed up with a warranty...all the way down to pots and dirt. If you get something bad he'll make it right before you can even complain. You won't find that at TX Hydro!