Quote Originally Posted by denverbear
aren't we supposed to change the nutes every week....serious question...and the ph is checked everyday with water being added for evaporation as needed.......are we wasting nute by doing this weekly ???
This is where growers will agree or disagree. Some growers change weekly and some go as far as just topping off res with nutes throughout the grow. Whatever works for you is really what matters. I was draining and replacing weekly but I was only using a 20gal res. I don't think it's a waste of nutes, example: let's say you top off res with a ppm of 1200. 3 days go by and 10 gallons less in the res, check the ppm's after you top off res and before you add nutes. If your ppm's dropped down to 800 after topping off, you can see that your plants are taking in the nutes......

Happy Growing......