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medicine21
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medicine21, you mention locating the pump higher in the room. i believe this is to address a separate issue, if the pump should go off and it is down low, there is the possibility of water syphoning back through the airlines and draining buckets.
yes you should always have the airpump higher then the water level
if you think its a myth them try it - seems more like comnon sense to me
I hear ya - need a meter first to see if it decreases the amnount of DO
and then a side by side run to see if it effects the growth rate
My PH stays stable throughout the entire grow and I have my reservoirs in the grow room to maintain good water temps. My room always stays around 1500 ppm of CO2. It actually will slightly rise after a res change, but after its stable, it stays there. The only time I had ph drop on me, is when I got some root rot a while back.
The science behind it makes sense, but I feel that the effects are so minimal, that it makes no noticeable differences. In ph or plant growth.
To create the perfect environment... just mount your air pumps outside of your room.
yeah, i am pretty certain you are right...when i had ph fluctuations I was not dialed in like now, i was in hydroton and had other factors which had more effect on ph than I would think that the standard co2 enrichment levels would have...i guess someone could do the (stoichometry?) math and know for sure but yeah i def agree, just thought it was a consideration, i have read some posts from people that cant afford or dont want to buy a proper control and have co2 swings up to 3000 or more, they quote Ed in his book as saying those levels will not hurt plants/people.
I changed a couple things, mainly though is i am using SuretoGrow, and since starting with that and the new setup (new house and totally cool new setup) i have not had to use ph up or down, it drifted down to 5.9 but it ws time for silica blast and tht brought it back up, all the way to 6.0 lol...I am really happy with ph stability, I know some people say that ph swings are good but i like it stable.
oh, btw, you keep your res' in the grow room for temp reasons? i do the opposite so i can let the grow room go up to about 80. I thought that the higher temp with co2 was better? I would love to know if someone has better results or reasons to keep it cooler in grow room. I have wondered about that from time to time, if higher temps w/co2 was better.
sorry didnt mean to go off on tangent...
BTW; there is more oxygen in an outside room and it would be cooler air too, this effects the amount of DO. If you could take cold air from winter outdoor areas or a refridgerated space it would increase the DO level siignificantly. (Cold air is denser and will help lower the water temperature increasing the amount dissolved)
The grower comparisons aren't really valid as each room has many many factors that are in flux and are different sizes, plant numbers and sizes, light values, nutrients used, ambient temps and humidities and so on. Peace Bad...
I try to keep my room around 76-78. On hot days it will go a little above 80. But my res temps are always about 10 degrees cooler then the room itself.
Plants have to work harder to stay cool if your temps are up and RH isnt there with it, which means more water uptake and evaporation. You can go up to 90+ degrees with a Co2 enriched environment, but I would suggest letting your temps get that high, unless you want fluffy, airy buds.
I like to run my room a little cooler. In a range that I would be comfortable at. Then enrich it in Co2 and maybe raise the temps just slightly by a few degrees.
If you keep your room at 80 degrees, then hit them with 67-73 degree water, the plants done seem to like that much. I look at it as it being a hot day outside, then someone throws a bucket of ice water on you. You'll go into an initial shock, then get use to it. So I try not to let me res temps drift too much away from what the room temperature is.
How do you keep your res temps that much cooler than ambient if you dont mind me asking? I am lucky enough that I have the room in my new place to have the res' outside the grow room. I am always open for info though cause I might need it oneday, so I would like to know if you have like a big res or what?
Originally Posted by MMRC Grower
I have 75 gallon, flat reservoirs that sit on a cold concrete floor. Since they are wide and flat (only about 14" tall), there's more surface area in contact with the cold floor. Also since warm air rises and cold air sinks, and they are sitting under flood tables, out of light, they seem to stay about 5-10 degrees cooler then the rooms temp.
The air pump I use is a 70 lpm commercial pump, that sits right next to my intake fan and underneath my air conditioner. I tend to steer clear of the 12 inch air stones. I like the air cylinders much better. They produce smaller bubbles oxygenating the water much better in my opinion. If you put your hand on top of the water in my res', its like a freshly carbonated soda. Seems like its sizzling, but just with oxygen, instead of carbon dioxide like a soda. Also, the flat 12" air stones accumulate build up over time and tend to clog. The cylinders stand upright, and its pretty tough for those to get clogged since residue floats more to the bottom, then sticking to the walls of the cylinder.
My air pumps have a fitting to fix a hose to the intake so the pump can be in the room and drawing air from somewhere else. The counter side to this is that it pumps air from outside in and if you have a sealed room you are creating positive pressure. What I really would like to know is if Oxygen supplementation in the root zone (using oxygen gas) would help root growth. I am sure it is not worth the risk as aluminum is combustable at increased O2 levels but it would be cool to try
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