Top off res with nutrients or just water?

[RUKind]

my plants are drinking a lot and i use an aeroflo system as well...i top off w/ plain water following the golden principle of "underfert is better than overfert"....at least your plants wont die and you can observe them and add nutes if they show any deficiencies (mine never have)

RUKind Reviewed by RUKind on 11-24-2005. Top off res with nutrients or just water? Hi, after mixing a fresh reservoir of nutes (in an aero system), the ppm was 1350. 24 hours later, it was just under 1000. Next day, it was under 800 â?? a pretty weak level for foot-plus plants. Iâ??m a complete newbie to hydro, so I was wondering: should I be replacing what they eat everyday (bringing the ppm level back to 1350 daily), or should I let the plants drain the drink down to ? I read on this forum one opinion that replacing what they eat is good. But logic is also telling me Rating: 5

[fhydro]

Well, the problem is more simple i think. If the water level drops with the ppm level, putting plain water would drop the ppm level as much. So, except if there is nearly no water, you must consider the problem, but if the PH is good and only the ppm level drops ( and water a little also ), don't do nothing. Yes, one thing, change the nutes avery week. I add water only in case of PH problem ( low PH ). During one grow, i added normal mix of nutes to top off the rez ( summer, heat, evaporation ) and i had a serious over fert problem. I think that the ppm dropping means only that they eat the nutes.
Fhydro