4 32 site xl undercurrent systems in a 20X40 room

[Renfro]

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.

Agreed, PM love RH% fluctuation. The dry time allows the spores to propagate easily and the wet times cause it to spawn and grow in a matter of hours. So keep those numbers nailed down indeed.

It is important for growers to remember how humidity works. The cooler air is the less water it takes to put it at 100% saturated. So having warm air thats at 50% cool down will cause the humidity to rise. That is why many growers experience their first bout of PM after a period of lights out where temps dropped and ventilation / dehumidification is inadequate. To make it a double whammy, dehumidifiers are less efficient in cooler air.

 

[ttystikk]

Agreed, PM love RH% fluctuation. The dry time allows the spores to propagate easily and the wet times cause it to spawn and grow in a matter of hours. So keep those numbers nailed down indeed.

It is important for growers to remember how humidity works. The cooler air is the less water it takes to put it at 100% saturated. So having warm air thats at 50% cool down will cause the humidity to rise. That is why many growers experience their first bout of PM after a period of lights out where temps dropped and ventilation / dehumidification is inadequate. To make it a double whammy, dehumidifiers are less efficient in cooler air.

That's because you gotta add heat to dehumidify.

 

[bdt1981]

Illncheck my night time humidity but i thinkbthe high is like 35 and low is 30. I have much air circulation also like 15-20 drop in temp at night. I think i need a wifi thermostat for mega split. Anyone know of a controller that works with mini splits that dont have a plug tob plug in.

 

[bdt1981]

Upon changing nutes and flipping to flower tonight i kept it low at 280 ppm. I need to seriously do a top off res. For now im just adding nutes daily.
Curious to see what kind of strech im going to see on this system

 

[Mikenike]

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.

Ohh yikes looks like I may be in for the same ride. I’m using a 1/2hp to chill 55g set at 50f to cool my room (about 1500w of lights) with the ice box and a 35g rdwc. Temps are usually 80-88f because I have co2, and 55-70%rh. Have my 55g res wrapped in two layers of pink insulation now hopefully it’s not too bad. Would hate to have to upgrade chillers.

hey @Renfro I’ve been reading some of your old posts but can’t seem to find it now, don’t/didn’t you run co2 for veg and flower?

 

[Renfro]

hey @Renfro I’ve been reading some of your old posts but can’t seem to find it now, don’t/didn’t you run co2 for veg and flower?

Co2 bleeds into veg from my flowering rooms and in veg it's around 600 - 700 PPM. In flower it's 1000 - 1200

 

[bdt1981]

Ohh yikes looks like I may be in for the same ride. I’m using a 1/2hp to chill 55g set at 50f to cool my room (about 1500w of lights) with the ice box and a 35g rdwc. Temps are usually 80-88f because I have co2, and 55-70%rh. Have my 55g res wrapped in two layers of pink insulation now hopefully it’s not too bad. Would hate to have to upgrade chillers.

hey @Renfro I’ve been reading some of your old posts but can’t seem to find it now, don’t/didn’t you run co2 for veg and flower?

 

[bdt1981]

Ok so im thinking im getting closer to the strength they like. At 290ppm they only dropped 10 ppm over night
Can see

 

[bdt1981]

All i can say is wow! Extreme growth every single day in this system. Had to go in and thin it out. Took many cuttings. Like so many i dont know what i will do with them. Lol. The ban kush and gold leaf are stout ass plants. The branches are pretty stiff with tight nodes. The glue is more spread out. Both big. The mku is pretty tight along with the slh. Seems the slh is coming back strong. Guess the trick is to really ease the plants into this system. Maybe less than half strength nutes be safest. Its crazy how much they grow. Noticed the water level dropped about half inch over night. Ppm lost 10 ppm mixed 30 gal of half strength and brought it back to to 280ppm. They seem to dig it. Here are todays pix. One of my lil veg stuff as well.

 

[westcoast420]

Nice setup man. Just curious why your feeding so light? I give seedlings 2x the ppm your giving those girls. Alot of peoples tap water is 200 ish ppm.

 

[nDanger]

Nice setup man. Just curious why your feeding so light? I give seedlings 2x the ppm your giving those girls. Alot of peoples tap water is 200 ish ppm.

Westcoast, apparently with the monster air pumps these systems have, the plants uptake nutes super efficiently. It's one of the trickier lessons you have to learn with Current Culture. Btdt seems to have learned it in his mind, but his heart (like all of us) wants to push it to the ragged edge. I'm about 7 weeks ahead of him with my new system and he'll do the same thing I did. "I'm in week 5 so I'm going to push these babies up to 770ppm!(1.1EC)" WRONG! They would have been perfectly happy at 630ppm (.9EC). So I've learned it, and he will too!!

 

[bdt1981]

Nice setup man. Just curious why your feeding so light? I give seedlings 2x the ppm your giving those girls. Alot of peoples tap water is 200 ish ppm.

Because signs of burn on one of the strains. Just playin safe. I will stay at half strength until i see they need more. Current culture says to go half strength with hyper airation

 

[bdt1981]

Westcoast, apparently with the monster air pumps these systems have, the plants uptake nutes super efficiently. It's one of the trickier lessons you have to learn with Current Culture. Btdt seems to have learned it in his mind, but his heart (like all of us) wants to push it to the ragged edge. I'm about 7 weeks ahead of him with my new system and he'll do the same thing I did. "I'm in week 5 so I'm going to push these babies up to 770ppm!(1.1EC)" WRONG! They would have been perfectly happy at 630ppm (.9EC). So I've learned it, and he will too!!

I have no desire to push anything anywhere. Why would i change it up when its growin good. Less is more.

 

[bdt1981]

Westcoast, apparently with the monster air pumps these systems have, the plants uptake nutes super efficiently. It's one of the trickier lessons you have to learn with Current Culture. Btdt seems to have learned it in his mind, but his heart (like all of us) wants to push it to the ragged edge. I'm about 7 weeks ahead of him with my new system and he'll do the same thing I did. "I'm in week 5 so I'm going to push these babies up to 770ppm!(1.1EC)" WRONG! They would have been perfectly happy at 630ppm (.9EC). So I've learned it, and he will too!!

I learned before i started using the system. I went over accidently because my probe wasnt fully submerged. I caught it and backed it way off. I plan on making it thru with my first run.

 

[westcoast420]

Because signs of burn on one of the strains. Just playin safe. I will stay at half strength until i see they need more. Current culture says to go half strength with hyper airation

I honestly dont know how thats possible to get burn at that low of ppm. Have you checked your meter? Ive used rdwc systems, aero systems etc and have run up to 2 ec and over without issues. I run 700 ppm in my aero cloner once there rooted lol. Not trying to be a dick or anything just want to see you get the most out of that system. Have you flipped yet? Awesome setup for real tho man hope you kill it!

 

[bdt1981]

I honestly dont know how thats possible to get burn at that low of ppm. Have you checked your meter? Ive used rdwc systems, aero systems etc and have run up to 2 ec and over without issues. I run 700 ppm in my aero cloner once there rooted lol. Not trying to be a dick or anything just want to see you get the most out of that system. Have you flipped yet? Awesome setup for real tho man hope you kill it!

I have ran 1600ppm in an aeroflo. This is different. Did i check my meters? Lol. No thats probably it. Lol. Jk. I hit them with 450 accidently and left then had to come back and noticed one strain had rust looking spots. I read before about that meaning to much. Some roots started to get a beighish tint to them. Within just few hrs. Backed it off to half strength like the designer of the system suggests you do and like i did but my metet got me. Some leaves took the burn, grew slower couple days then continuing half strength they have really started to take off. Flipped on the 3rd 21 day veg

 

[bdt1981]

Last nights pix comin up. Trying to get them all cleaned up and cages on. Taking quite a few cuttings. Went up to 350ppm since it dropped 40 ppm thru the night. Having the common upward ph drift now. Set doser at 5.9 to help. I keep putting off doing a top off res. Need to get on it tho.

 

[westcoast420]

Well if its working then its workin! Typically the start of nute burn would be the tips going brown or yellow then brown. When Ive got rust looking spots before it was too much calcium I believe but that was a long time ago. Anyway enough of that, What nutes you running? Are you running the gavitas at full power yet? Those should start exploding pretty soon!

 

[bdt1981]

Well if its working then its workin! Typically the start of nute burn would be the tips going brown or yellow then brown. When Ive got rust looking spots before it was too much calcium I believe but that was a long time ago. Anyway enough of that, What nutes you running? Are you running the gavitas at full power yet? Those should start exploding pretty soon!

Cultured solutions. Yes gavitas at 115 %. I thought they started exploding already. But i havent grown on one of these before. Left at 350 last night and now they are back down to 280.

 

[bdt1981]

They def starting to eat more.