Well said @Ray2nasty 
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I’m bilingual, I can do French if ever need be guys and gals!
Merci!
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Nice review. Apparently an app will be here shortly according to a Q&A video posted a couple months ago
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How exactly do you do an air stone outside the box?
The back bottom left corner has a moveable venting slide. If you thread the tubing from inside the unit down the back left corner you can pull it out rhe back and plug it in.
I run one in both my units full time regardless of grobos or not.
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I’m not quite understanding what you mean by plugging it in. The back right has a big plastic piece that’s moveable.
Okay never mind that, I forgot for the moment we were talking about outside as I was reading response re stone on other thread as well at the same time and got confused, sorry.
I see the panel outside but I’m still going to need major simplified step by step a b c photographic instructions for this I think 
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Thank you so much!
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Video or pic I need to no also just in case cause my second grow n still running grobo airstone n airpump . I do have a back up of both but when time comes I will be clueless and in panic mode lol true facts😆
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Ill take photos this weekend for you to see
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Thx todd
Thank you very much!! 
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Lift white lid when plant is not there and thread your tubing down the left back side. On the outside of the unit in the second photo is where tubing comes out the back and plug into your secondary pump. You can even use grobos air stone of you want. I use a new one every 2 grows
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So how does it work if I want 2 is there 2 tubes or?
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Put as many as you want there. I have a stone per machine myself
I have one fan in one unit threaded out the front.
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Thank you for the pictures. I’m still just a little confused but after more looking on amazon I think I got it. So there’s an air pump that I’m guessing sits outside the unit plugging into a wall and nothing plugs into the grobo through the opening in the back right? Just the hose for the extra stone runs through there to the pump, have I got it? I think I must be close looking at this aquatic stuff, never owned fish 
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You got it.
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Thanks @Todd.grobo !!! I appreciate your patience and understanding with my being such a newbie!
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Its all good. One day my tent grows will be big like chris’s lol.
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@Merle_Carsten,
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(My Husband -And- I Have Two Grobos -And- Still Happy With Them):
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}:@Merle_Carsten,
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https://www.allgrowers.com/t/your-plants-are-very-nice/9672/2?u=silvergrobo
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(Basically Easy): (Keep Your Two Sensors Cleaned): (Drain/Fill Tank Once A Week [Keep Filled Through The Week]): (Keep Your Nutrience Up): (Look -And- Watch For Any Signs On Your Plant, -But- If Your Temperatures/Humidity Are Good She Should Be Super Happy): (Coco-Pod Should Be A Little Damp In Germination): (-Then- We Try To Dry Her Up When Enough Roots Hit The Water To Sustain Her Feedings):
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How much do they produce… How complex is it¿