there was only one child who said what i was thinking…
this doesn’t look like water…
we change our water daily and add different things:
yellow food coloring
yellow paint (this makes an opaque yellow
apple scented bubbles
baby shampoo
and my favorite of the week: banana extract
we also move the mirrors to different spots. over the water table, next to it, one on each end, etc.
newcreationpreschool.com 
I must confess, when I saw the title on my blog I had that thought too:).
I love your clear water table! Mine is black and colored water does not show up. You are fortunate.
wow! this looks like awesome fun!