There was great excitement as this kit was set up at Christmas. We did everything according to the instructions, but weeks later, instead of lovely crystals, we had evaporating opaque water with a semi-translucent sludge at the bottom. So shattered is our faith in chemistry, and science in general, we have since reverted to a stone-age animistic existence* and statistically-speaking, praying to rocks and fire has been more successful than growing these stupid crystals.
*We did keep our broadband account, obviously.