Does the grobo feed every water change?
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keywords in your question
Water Change = Required drain first.
After a successful DRAIN and fill, your unit will dispense nutrients.
If all you do is “fill” and never drain, your unit will not dispense nutrients as it considers it a top-up for your “plant is thirsty notification”, not a “change my water” notification
These two steps are the most important weekly maintenance you can do, anything else is secondary 
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My bottle 5 ran out on my last drain and fill i just got my new one and was goin to do a drain and fill again so get all nutrients to plant thank u for the fast reply
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Hey Todd during flowering would you recommend a top up every 2 days or 3 days thank you sir?
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Grobo recommends topping up when you get your notification your plant is thirsty and your weekly drain and fill.
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Ok thank you sir, I just know she drinks a lot in flower!
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What is it roughly a liter or so a day?
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I am about a month from flush and I fill every day now and sometimes, it takes a lot. I am not sure how much as I have one of those 2.6g collapsible buckets I shown before, filled and sitting next to it.
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Thank you Todd for the link! Cheers
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I do every 2 days and it takes about 1/3 of a gallon.
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