Reservoir : stirring pump or air stone?

KasparGrower

Well-Known Member
it depends on how big the pump is. and your environment too. and probably a few other variables.

you could probably find a chart somewhere that would tell you how a pump of X watts warms up a reservoir of Y gallons.

DTW in coco is much more forgiving to temps than DWC

and don't mind Cheese, i don't think he grows to be honest. ask away man, that's the only way to learn.
I'll try to find those charts on Google. Thanks!
Jumping on coco was a wish for a while and now that I'm willing to expand my groom it becomes almost a necessity. I can't see myself handwatering 16 plants in 15l pots of coco...
I will keep to educatw myself regarding this medium,that it looks like the best medium if you know how to work with it.
 

KasparGrower

Well-Known Member
It was not an attack but your questions was a complicated mix of assumptions.
I didn't feel it was an attack neither... I know how my way to ask question is,and I understand that it may seem a little too much but I hate to have empty spots. I dont't know if you get me.
 

KasparGrower

Well-Known Member
that's the key. study up on how to use coco properly.

i tried it and hated it personally. i refused to use a medium that was so finicky.
I will try to water with a drip system 4 times a day when the roots will have filled the final pot.
What do you use now?
 

NeWcS

Well-Known Member
Coco can be a nightmare. I lived it before I knew my coco.
https://www.cocoforcannabis.com/how-to-prepare-and-buffer-coco-coir/

I'm forced to run a chiller. Without it, my res temps can hit 90+ f.
Really? And not to jinx myself, but I've been in coco for years and never prepped it. And I use the cheapest block I can find AMZ. For years I'd just add 5gal of tap(175ppm) water to it, a little perlite and go. Now I have an RO system so I'll just be adding that to the brick. The first water after transplant I just water till it no longer has color to it. I have never heard anyone say that coco was a nightmare for them. I've been lucky I guess... Peace
 

Cannademik

Active Member
Really? And not to jinx myself, but I've been in coco for years and never prepped it. And I use the cheapest block I can find AMZ. For years I'd just add 5gal of tap(175ppm) water to it, a little perlite and go. Now I have an RO system so I'll just be adding that to the brick. The first water after transplant I just water till it no longer has color to it. I have never heard anyone say that coco was a nightmare for them. I've been lucky I guess... Peace
I made the mistake not prepping my coco.. I'm running through so many issues now. I've learned my mistake and will now prep my coco.
 

Renfro

Well-Known Member
Some commercial growers on hydro state that they don't use airstones because 'it also brings CO2 in the water'.
I have a 55 gallon drum that I mix my veg nutes. Running air stones in to 24/7 would cause the pH to drop into the 5's pretty quickly. This is supposedly because the CO2 causes carbonic acid. If I use a water pump to move the water then it's all good and my pH stays stable. I have also put the air stones on a repeat cycle timer so they run a couple minutes every 20 minutes.(my current setup on that barrel as my pump died and I haven't replaced it yet). That works well and the pH doesn't drop nearly as much. Another downside to air stones is all the heat they add from the air being compressed.

Anyways thats my experience FWIW.
 

KasparGrower

Well-Known Member
I have a 55 gallon drum that I mix my veg nutes. Running air stones in to 24/7 would cause the pH to drop into the 5's pretty quickly. This is supposedly because the CO2 causes carbonic acid. If I use a water pump to move the water then it's all good and my pH stays stable. I have also put the air stones on a repeat cycle timer so they run a couple minutes every 20 minutes.(my current setup on that barrel as my pump died and I haven't replaced it yet). That works well and the pH doesn't drop nearly as much. Another downside to air stones is all the heat they add from the air being compressed.

Anyways thats my experience FWIW.
Do you leave the stirring pump (before it broke) ON 24/7? Or you have it on a timer?
 
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Renfro

Well-Known Member
Do you leave the stirring pump ON 24/7? Or you have it on a timer?
You can do either. I have one of mine on a repeat cycle timer to run for 2 minutes every 20 minutes. When adding nutrients to my tank I just hit the reset button so it starts pumping, maybe hit it again to keep it going while I add everything. The other two just run all the time. I set my pumps up with a zip tie around the cord and the output nozzle so I can lower it down and it will sit on the bottom aiming up. when the barrel gets low I have to unplug the pump since the water shoots up and hits the lid. Don't have to worry about that if using the air stones. With the air stones running for 2 minutes every 20 I haven't noticed a significant pH drop over about 10 days and I have a big ass air pump on it with 4 air stones.

I have a float valve to my RO filter to fill the drum, when it's full I turn off the float valve feed and add nutrients. When it's used up I make sure I close my dump valve lol and start it refilling. With my filter it takes about 5 hours to refill.
 

KasparGrower

Well-Known Member
So you have a stirring pump plus 4 air stones? Pretty dope! It must be a big ass res.
What do you suggest me to have for a 225L tank as far as stirring nutes and aerating goes?
 

Renfro

Well-Known Member
So you have a stirring pump plus 4 air stones? Pretty dope! It must be a big ass res.
What do you suggest me to have for a 225L tank as far as stirring nutes and aerating goes?
I have three tanks, one in each room. 2 have pumps, one had a pump and the pump died, so I just stuck an air pump and air stones I had sitting on the shelf on it for now. Works well so if it aint broke don't fix it. Putting the timer on the air pump makes all the difference and the pH doesn't plummet.
 

KasparGrower

Well-Known Member
I have a res about that size on my flood and drain in my tent, I put a 250 GPH pump in there stirring it 24/7. Thats the same pump I use in my 30 gallon barrels. My 55 gallon had a 400 GPH pump before it died.
Thanks for the info!
It's all still a project. What bothers my mind the most is the fact that I don't have direct access to my water in the room,so I will have to fill a few 50l tanks to pour after in the res... It will be a pain in the ass.
I will have a DTW system and I really hope to refill the whole res once every 10/15 during each cycle so I can give my back a break lol.
 

Keesje

Well-Known Member
A recirculating hydro setup could save a lot of labor. My flood and drain system runs its res the whole cycle with only top offs.
So on day 1 you make a res.
You check the pH and the EC, I guess.
And how do you go on from there?
Do you top of with R water?
Or with water with nutes and then check pH and EC again?
Or what is you system?
 

DrKiz

Well-Known Member
This is what I use. Have one in my 30 gallon and one in my 55. Cheap as heck. $30 CDN delivered.

Quiet as can be. Minimum power and heat.

They’re not pumps. Basically little jets. I zip tied one to my pump piping pointing to the bottom of the res.

You can see the surface of the nutrient solution swirling slightly when it’s on.

Perfect for me. Low heat and power, quiet, no ph fluctuations, increases DO, cheap and easy to install.... just a zip tie.
4F91D71C-76CD-48C0-9047-4001553764C9.jpeg
 

bankcee

Well-Known Member
I have a res about that size on my flood and drain in my tent, I put a 250 GPH pump in there stirring it 24/7. Thats the same pump I use in my 30 gallon barrels. My 55 gallon had a 400 GPH pump before it died.
what about powdered nutes? thinking of going maxibloom start to finish with silica and maybe a bloom booster later weeks of flower. but maxibloom is powdered. was considering a mixing plate but i’m not sure how i would do it on one of those..
 
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