4 32 site xl undercurrent systems in a 20X40 room

bdt1981 said:

How many de 1000 watt gavitas should i run? It calls for at least 32 lights right? How much air conditioning will it require? 15 tons? Or should i run 20 tons ( 4 5ton mini splits) to account for dehumidifier and co2 generator?

Im trying to open up a medical grow in oklahoma and needing to order up the equipment.
Also what is the best rez to use with a 5 ton ×ater chiller? For sure need something insulated. What are people using?

Im trying to run 4 ucdbxl32s

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I'm in Oklahoma as well. Gonna fallow this and asksome questions aswell.

So i actually planted them on the 13th of oct evening time. So i was off a day or so. Pix of Day 9 after transplant into uc. Did a bit of trimming. any leaves that needed gone are gone.

Hope i didnt fuck to much up by topping them today. They should be fine i think.

Day 15 after ph drop of about .5 in over 24 hrs i did like a 99% change out. Half stregnth ppm at 210 and ec .4. Can that be right? The chart says week 3 420ppm and .6 ec. Since im half the ppm dosent it make it half the ec? Apparently not.
They seem to be fine but like a few slh felt the burn of high ppm. Damm humidity is bs right now at like 35% had to spray water on the floor to bring it up to 55%. Prob look into a humidifier tomorrow.

bdt1981 said:

The chart says week 3 420ppm and .6 ec.

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Those numbers aren't the same.

dunno what chart you are using but if 210 PPM is half strength it seems weak to me personally.

Renfro said:

Those numbers aren't the same.

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I got to read up on ec more.

Renfro said:

dunno what chart you are using but if 210 PPM is half strength it seems weak to me personally.

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This one.

bdt1981 said:

I got to read up on ec more.

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Im gun shy right now on my first run. Initally i was plannin on following directions but more than one person said over 500 will start to burn. And cch2o says with hyper airation reduce ppm by 1/2

As long as you don't see any deficiencies then all is well. When I ran DWC with GH 3 part I ran around 1000 PPM full strength.

There are some errors on that chart with the EC / PPM

I have a question for ya. Would you be worried about humidity being 30-35%? Like to the point of need to fix right now or is it something that you would just eventually fix?

Renfro said:

As long as you don't see any deficiencies then all is well. When I ran DWC with GH 3 part I ran around 1000 PPM full strength.

There are some errors on that chart with the EC / PPM

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Well, humidity being too low, other than stressing the plants, can cause PM to pop up easier if the RH% rises. PM likes fluctuations of temp / humidity. So I get concerned if one of my swamp coolers goes down as they are my humidifiers hooked to an autopilot. I really like to stay around 40 - 45 % in flower and around 55 - 60 percent in veg / stretch.

What is PM?

Powdery Mildew

Renfro said:

Well, humidity being too low, other than stressing the plants, can cause PM to pop up easier if the RH% rises. PM likes fluctuations of temp / humidity. So I get concerned if one of my swamp coolers goes down as they are my humidifiers hooked to an autopilot. I really like to stay around 40 - 45 % in flower and around 55 - 60 percent in veg / stretch.

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The operative word here is 'stay'. Having RH go up and down a lot is ideal for the spread of powdery mildew.

@Renfro you know this, I'm just driving the point home for those who may not.

I have been curious as to when i should add in the top off res. It just seems like it wouldnt be needed at first since the roots are small. Ill have to make sure i log the water level this evening and see where it ends up in the morning. I think they took up about 1 1/4" of nutes in 24hrs. Cant be for sure since i didnt make a note. Definatly past time for top off res. Not sure how much water that would be in gallons but i was 1 3/4" up net pot and today the bubbles were about bottom of net pot. Ok i tried to figure it on paper at about 40 gallons of water in 24 hrs. More than i would have thought.

Ok so night before last my ph started dropping. Down to like 4.8 over night so i put some up in the doser and it gets locked at 6.0. Its 6.1 today with only 1 dose of ph up. Seems like it stabilized for now.
The slh really disappointed me. They cant handle 200 ppm nutrient. Oh well now i know not to use them anymore. Im a little nervous about flipping to flower. I guess the older a plant gets the more nutes they can handle right?
Anyway here todays pix. They really grew a lot since last night. Ppm was 210 went down to 140 i brought it back up to 210. Might go ahead and flip tomorrow since it will be day 21 veg

@Purpsmagurps i have had no issue keeping the system at 65-68f using stainless steel wort chiller. All 32 sites.
I remember you saying that it would be warm a few buckets into the circulation.

bdt1981 said:

@Purpsmagurps i have had no issue keeping the system at 65-68f using stainless steel wort chiller. All 32 sites.
I remember you saying that it would be warm a few buckets into the circulation.

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What temp water are you running thru your wort chiller? I’m trying to dial my smaller system in and have just got my wort chiller. But I also use my cold water res to cool my room

Might be difficult to keep in check when using your water to cool other things. Used to do ebb n flo with water cooled ice boxes and went ahead and threw a coil in res to keep water fresh. It worked so so. I set mine at 55. I have about 125 gallons of water in it and some expensive sticky insulation stuff. But it is consistantly. 64-68f daily. Thats with lights at 115%. Room right at 78-81f. Humidity has been constant 35%. Ugh...
Im anxious to see if the 1.5 hp is enough to cool 3 systems.