Tiny,
This is my first post, but I've been on the boards for a while and am just wrapping up my first cabinet DWC grow. I've got one plant going in a tub that holds only about 1.5 gallons of water. I've always topped the resevoir with the same concentration of nutes as I used with the resevoir change. Usually about a quart or two every other day. I'm using Botanicare nutes, but that shouldn't matter for you. I never saw any nute burn, and I've grown what seems like a "monster" to me under cfls. I have changed the resevoir every seven days, and I think that's a good idea with such a small volume. Ph doesn't seem to stray much, and I just make sure that what I pour into the resevoir is right at 5.7. No problems for me doing it that way. I love DWC. Only issue has been the air wand plugging up. Live and learn. Good luck.

Mo
MoMoHappy Reviewed by MoMoHappy on . When topping off your rez....... I have read that when peeps top off their rez that the preferred method is to top off with plain PH water untill you have added back the same amount as your rez holds, my question is when topping off would there be harm alternating between plain and nuted water? Meaning you have a full fresh rez on Sunday, Monday you are down a gallon so you add Plain PH water. Tuesday you are down a gallon so you add a gallon of nuted water. next topoff you do plain again and so on until end of week or 10 days Rating: 5