I just did it because at first my pump would run me dry, so I always left a little in the buckets and ran just long enough to move the water around. I built a new system and just stuck with what I was doing. I run a tri meter continous monitor in my controller bucket with a heater. I seen the nutes and Ph stay good, my plants grow good, I have nice large roots (see my grow log: ATF in recirc DWC), and I have so much other shit running I am trying to save some power anywhere I can.

Now on the e&f/dwc veg room I still turn the pump off but they run longer, I am considering trying to run it 24/7 and see if there is any noticable difference.

Mainly I did it becasue I don't know better. I am still new so I just try crap and it works I just keep doing it.