You hydro guys must have to much time on your hands. I have no time for PH, TDS or measuring nutes.. I spend no more than 2 hrs, twice a week at my growroom. Water, shave legs I'm out.
I use Coast of maine a years worth of stuff
6 cu.ft Bumper crop = $24
3 cu.ft Lobster compost = $16
4 cu.ft perlite = $20
10 cups of Hollytone = $16 for 20lb bag last years
10 cup Dol lime =$ 6 for 25lb last for years and years
gal organic gem (fish emulsion)= $50
gal Biobizz bloom = $50
lit. Biobizz top max = $30
gal Cal Mag = $40
So like $250 a year.