J
jack the reaper
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oh yea bra, i forgot to tell you, if you do decide to get one... make sure you look at its prerequisites
as some require you to have a pump for it as well... some want a water pump, some want an air pump...
i got one of the JBJ lines because i was comfortable and highly pleased with their line of chillers, so i figured what the fuck... try their other shit...not to mention it had already came with a pump, unlike other kits
http://www.marinedepot.com/uv_ultraviolet_sterilizers_ozonizers_jbj_submariner-ap.html
Its kinda hard for me to get slime in my water. i keep it a nice and chilly 55-58F.
i believe this is what DDs talked about in one of his threads. Increase the D.O. as much as possible and keep the temps low.
i've read that the optimum water temp for maximum D.O. was 59 degrees F. i would love to know the difference in D.O. capability say, between 65 and 59 degrees.
and i'd also like to know if there are any downsides to having the roots in 59 degree water.
jack, i have not been able to find good info on the efficiency of waterfalls for aeration. i've wondered about your hand watering nozzle scheme. i have read research on stones and venturis and they are both highly rated methods for increasing D.O. someone on the board posted some pics recently of their venturi that they hooked up the air pipe to an air pump to increase air pressure (and assumed efficiency).
if anyone has a d.o. meter, i'd love to see some experiments along these lines so that we can get some data to analyze.
Papa
.....
and i'd also like to know if there are any downsides to having the roots in 59 degree water.
......
root rot is overhyped imo
a chiller and high DO levels will have you seeing victory
root rot/pythium is caused by low D.O. levels and warm reservoir temps along with warm root zones in hydroponic systems. Algae and the other are mainly from light leaks.
also, just cuz you have a sterile light in the rez...that doesnt mean the roots wont get it... pythium affects the roots itself, not necessarily whas in the water.
i.e. your plants have pythium and you go get a uv light to get rid of it..... dont think it works like that.... the already active root rot will just be sprayed with U/V'd water...essentially doing nothing
....ya dig?
Now then, I have Successfully used a UV filter to combat Pythium in a very similar system, didn't totally clear it up, but did let me finish the grow with healthy plants and a good yield. letting roots sit in water below 15 c will seriously slow down growth, the optimum temp is 19 c (66 f) this is as good as you can get as compromise between, high do levels, and good plant growth.
pythium will enter your system where it can, I'm sure it can be airborne.. and when in the water will be killed by a UV filter, Just like any bacteria (good or bad). And yes its correct that UV filters cause Iron drop out, I used a product called, UV balance I think by Growth Technology. The only thing to note is that pythium WILL thrive in warmer water (once its there). adding Trichoderma (present in canna Aktrivator or AN tarantula or piranha not sure which) will help the PLANT to defend its self against any present pathogens.. another note is that ANY bacteria good or bad, will thrive off high DO, and adding bacteria, should be done with caution in these systems.. I have this on authority from AN themselves...
peace
BL
yeh. that's what i'm talkin' bout!
and yeh, d.o. meters r expensive. that's why i don't have one. but if you get yours working again, or another (you tool hound!) how about checking out the efficiency of different airstones, venturis, and waterfalls? most of these dwc systems are using airstones up the kazoo, but i've seen no data supporting that is the best method. if a simple waterfall is just as efficient, i would like to know that (with the numbers). i could do without the airpumps and lines and stones!
it makes total sense that the increase in tds affects the d.o. numbers. i wonder what that graph of d.o. and temps would look like with the stuff we put in the water?
'great to see your roots happy at 56 degrees. a senior farmer here said just a couple months ago that that would kill a plant. i read lots of opinions, but i like to see the experiments myself.
Papa
i mean if i dont gotta go that, then why go that low, yanno?
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