Do I have to change reservoir every week?

I am growing in DWC, I change my soup about every 20 days.I have never had a problem.

 

you get what you put in. just do the changes. you'll get better and faster eveytime

 

I found this thread funny. I can understand a little paranoia when you want your plants to be perfect but completely changing your reservoir weekly sounds utterly foolish & wasteful. But hey, if it makes you happy DO IT! Hell, maybe my yields would increase 100 fold if I changed out weekly. Doubtful and there is only one way to find out... I won't be finding out.