How cold can DWC water be?

ru4r34l

ru4r34l

Well-Known Member
High All,

I have just brought a new water line into the grow room and am using it to refill my remote reservoir but the water temp is extremely cold (around 40).

Does anyone have any experience in using really cold water, right now I am adding 2L of boiling water to each 50L reservoir and the water temp comes back to about 45.

Any ideas if the cold water will hurt the ladies?

regards,
 
superstoner1

superstoner1

Well-Known Member
during winter my tap water will be 42-48* and ive never had a problem using it straight from the tap. extended periods of too cold water can be detrimental to the plants, below 65*, but for adding or starting the res, no problem.
 
tip top toker

tip top toker

Well-Known Member
I cannot put any figures on it, but my water used to get REALLY cold. I'm poor enough that i don't use central heating in the winter, just put on woolly clothes, so during winter, come lights out in the evening, it would be frigid, no water heaters or anything, just 12 hours of cold. Yields were slightly reduced but other than that the plants did just fine.

Typically cold just slows down growth.
 
ru4r34l

ru4r34l

Well-Known Member
superstoner1 said:
during winter my tap water will be 42-48* and ive never had a problem using it straight from the tap. extended periods of too cold water can be detrimental to the plants, below 65*, but for adding or starting the res, no problem.
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Good to hear, the water starts off at about 40 - 45, once the lights have cycled the temps level off around 59 - 61 lights off and 63 - 65 lights on.

tip top toker said:
I cannot put any figures on it, but my water used to get REALLY cold. I'm poor enough that i don't use central heating in the winter, just put on woolly clothes, so during winter, come lights out in the evening, it would be frigid, no water heaters or anything, just 12 hours of cold. Yields were slightly reduced but other than that the plants did just fine.

Typically cold just slows down growth.
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I can work with that because I am thinking this winter not to turn on any overhead heating but I grow in industrial building that almost reaches freezing with no heat, I thinks temp with no heating may slow growth too much in my case.

gagekko said:
Why not just get a fish tank heater?
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Because I only needed to have the water a little warmer to start, once the light cycles the water temps are beautiful, I just did not want to stick 40 degree water and shock the hell out of the roots.

Thanks for the responses, +rep

regards,
 
GreenThumbSucker

GreenThumbSucker

Well-Known Member
ru4r34l said:
Good to hear, the water starts off at about 40 - 45, once the lights have cycled the temps level off around 59 - 61 lights off and 63 - 65 lights on.


I can work with that because I am thinking this winter not to turn on any overhead heating but I grow in industrial building that almost reaches freezing with no heat, I thinks temp with no heating may slow growth too much in my case.


Because I only needed to have the water a little warmer to start, once the light cycles the water temps are beautiful, I just did not want to stick 40 degree water and shock the hell out of the roots.

Thanks for the responses, +rep

regards,
Click to expand...
I would not be concerned about it. Your system temps are in the 59 - 65 degree range, perfect. A couple years ago I ran a crop where the reservoir was in the 40s at night and I noticed no difference in growth. Plants can't feel cold like we do. The colder the solution, the more oxygen it can hold.

The general rule goes like this:
The warmer the solution the less oxygen it can hold.
The warmer the roots the more oxygen they can use.

The key is heavy aeration.
 
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