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Plants drinking more water than usual

I've been growing in hydro for years now and have a tray with three 12 inch wide rockwool slabs, four feet long. I make a fresh batch of 5 gallons of nutrients every day, water them with plugs in the drain holes and let it soak for 5-10 minutes, then drain. In past years I've usually ended up with at least 2 gallons of waste that was unused, but in this recent crop it seems like there's barely over a gallon left when I drain.

Right now they are in the third week of flower and I'm feeding: 100 mL/5 gal PureBlendPro Bloom, 30 mL/5 gal Liquid Karma, 30 mL/ 5 gal both Rhizotonic and Cannazym, with the occasional addition of 15 mL/5 gal CalMag and 10 mL/5 gal Hydroguard. In past grows I used to do a bit more nutrients at this stage, with 120 mL/5 gal PPB Bloom and 40 mL/5 gal Liquid Karma.

Should I start watering more often? Are they telling me they want more nutrients?

In the attached picture, I used to get drained amounts near the blue line but in this crop they are near the purple line.
 

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aridbud

automeister
ICMag Donor
Veteran
Question is....how do they look? Green and healthy....then leave them be.

Has the environment changed? Different strain?
 

gardener60

Active member
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If your Ppm drops that usually means they are eating nutrients more than water. If the Ppm is rising then they are the eating food they want and are drinking more water.
 
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