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HYDRO Dwc ??

You will have to get a feel for it...like I check levels every PH adjustment and fill as needed. So every 3 days or so. When she gets bigger, she will get even more thirsty so it’s hard to put a date on it since it is plant size and reservoir size dependent.
Just make sure when you replace a gallon of water, you replace a gallons worth of nutrients too. Then change the water out completely every other week or so.
 
Howdy Juicyj89, I change out the water completely every week. I top off the reservoir (to the fill level) with plain pH'ed water at mid week. This schedule is what GH recommends for their nutriments in a DWC or a RDWC system and it has worked very well for me.
Good luck with Your grow.
 
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