now im not to shabby on hydroponics but i have read that some of the more experienced growers sometimes dont even change the res, they will just top it off............ but thats all im going to say since im a soil guy myself.good luck
keeko Reviewed by keeko on . water question IM using a 15 gallon resevoir for my hydroponics,i change the water once every two weeks.The only reason i change it once every two weeks is that i just cant lift four 5 gallon water jugs every week.I'm wondering if i changed it once a week would you really see that much of a diffrence than opposed to 1 ev2 weeks,but my main question is can i just use my tap water instead without any serious reprocushons?,its just to much to lift all those jugs Rating: 5