Because I run a perpetual garden. I harvest every week and put more plants in every week. All in the same room I have plants that are in every week from 1 through 10. They are drawing feed from the same 30gal res. The only way to vary the feed and it make sense is to have like 6 more res tanks and main feed lines. Besides I've found very little difference between varying ec and not varying it. I handwatered with varying ec last winter. Just running 1.3ec now works just as good or better.
thats interesting i've never heard of anyone doing it that way . most people that harvest that often, hand feed .
how do you flush/leach your pants before harvest ? unhook them & hand feed ???