RDWC vs Undercurrent

mike45214

Well-Known Member
I'm looking for some input from growers who have done more than a few grows with each system. What I would like to know are the benefits each system has for speed and vigor on plants and the downfalls. Also what are any problems you've had with each. I just built a RDWC system and I'm considering converting it to an Undercurrent system so that's why I'm looking for info from people who have done both.
 

blackforest

Well-Known Member
What type of current rdwc system did you recently setup? I built a diy undercurrent system, based of cch2o. I've never ran any other type of rdwc system though. I guess they are all rdwc's if they are simply recirculating the nutrients. I started with 5 gal round buckets and now have square 8 gal. Are you going to buy a cch2o system, or build your own? It can take a minute to build a complete system w/ chiller, epicenter, and top off rez, but once it's all setup, it's pretty much autopilot. I have a 6 site in a 4x8 tent with the epicenter on the outside so it's easy to drain/fill/add with a top off rez feeding the system so it stays at the same water level at all times, and hooked up to a bl guardian for ec/ph/temp. I probably should have just bought the kit from cch2o after all the pain and anguish, lol.

How many sites / what size system are you looking at? They grow super quick once those roots hit the water and can get big quick, so not a super long veg time I've noticed. I pretty much change out the water once a week and that's it. I check to make sure they are feeding and there are no crazy ph swings, that's about it. If you want it to be pretty much no touch, it takes a few items and some mechanical ability. I don't see any specific downfalls of undercurrent vs rdwc.

Newer build w/ the 8 gal buckets
IMG_4856.JPG
 

mike45214

Well-Known Member
What type of current rdwc system did you recently setup? I built a diy undercurrent system, based of cch2o. I've never ran any other type of rdwc system though. I guess they are all rdwc's if they are simply recirculating the nutrients. I started with 5 gal round buckets and now have square 8 gal. Are you going to buy a cch2o system, or build your own? It can take a minute to build a complete system w/ chiller, epicenter, and top off rez, but once it's all setup, it's pretty much autopilot. I have a 6 site in a 4x8 tent with the epicenter on the outside so it's easy to drain/fill/add with a top off rez feeding the system so it stays at the same water level at all times, and hooked up to a bl guardian for ec/ph/temp. I probably should have just bought the kit from cch2o after all the pain and anguish, lol.

How many sites / what size system are you looking at? They grow super quick once those roots hit the water and can get big quick, so not a super long veg time I've noticed. I pretty much change out the water once a week and that's it. I check to make sure they are feeding and there are no crazy ph swings, that's about it. If you want it to be pretty much no touch, it takes a few items and some mechanical ability. I don't see any specific downfalls of undercurrent vs rdwc.

Newer build w/ the 8 gal buckets
View attachment 3795731
This was a 4 site DIY RDWC, round 5 gal buckets with a BlueLab in the controller bucket (nothing like BlueLab). The only difference I see between the two systems is that the water pump is on the outside for one and on the inside for the other. I still haven't made up my mind if I'm going to convert it yet that's why I was looking for some input from others who have been there. Hydro grows are pretty much all I know and I know that the speed from hydro is second to none. I'm trying to get the most out of my space in the shortest amount of time and if one system has benefits over another then I would like to go with that one.
IMG_0031.JPG
 

blackforest

Well-Known Member
This was a 4 site DIY RDWC, round 5 gal buckets with a BlueLab in the controller bucket (nothing like BlueLab). The only difference I see between the two systems is that the water pump is on the outside for one and on the inside for the other. I still haven't made up my mind if I'm going to convert it yet that's why I was looking for some input from others who have been there. Hydro grows are pretty much all I know and I know that the speed from hydro is second to none. I'm trying to get the most out of my space in the shortest amount of time and if one system has benefits over another then I would like to go with that one.
View attachment 3796109
I like your setup, give it a go! Changing to an undercurrent means uniseals, and they are a pain with 5 gal round buckets. I really don't see how either system would be much different than the other to be honest. Biggest factor I've realized is make sure you get a decent root mass in the buckets before you start to flower. At least that's what I've learned over the course of a few grows. Other than that, I don't see anything wrong with that setup, looks nice!
 

mike45214

Well-Known Member
I like your setup, give it a go! Changing to an undercurrent means uniseals, and they are a pain with 5 gal round buckets. I really don't see how either system would be much different than the other to be honest. Biggest factor I've realized is make sure you get a decent root mass in the buckets before you start to flower. At least that's what I've learned over the course of a few grows. Other than that, I don't see anything wrong with that setup, looks nice!
Guess I can run this setup this time and on the next go round try out an Undercurrent. That's only if I don't like how things go with this setup or growth isn't what I expect which I doubt it cause it's a hydro setup.
 

rkymtnman

Well-Known Member
Guess I can run this setup this time and on the next go round try out an Undercurrent. That's only if I don't like how things go with this setup or growth isn't what I expect which I doubt it cause it's a hydro setup.
if you don't like that setup, the one thing i would change would be swap those 5 gal buckets out for much bigger containers.

the rdwc that i built was 2 27 gal totes with 2 plants each and a 27 gal control tote. each tote would hold roughly 15 gals so 45 total gals. each tote had a waterfall too instead of airstones.

the more water, the more stable your pH will be.

but waht you got now should be just fine.
 

Freddie Millergogo

Well-Known Member
What type of current rdwc system did you recently setup? I built a diy undercurrent system, based of cch2o. I've never ran any other type of rdwc system though. I guess they are all rdwc's if they are simply recirculating the nutrients. I started with 5 gal round buckets and now have square 8 gal. Are you going to buy a cch2o system, or build your own? It can take a minute to build a complete system w/ chiller, epicenter, and top off rez, but once it's all setup, it's pretty much autopilot. I have a 6 site in a 4x8 tent with the epicenter on the outside so it's easy to drain/fill/add with a top off rez feeding the system so it stays at the same water level at all times, and hooked up to a bl guardian for ec/ph/temp. I probably should have just bought the kit from cch2o after all the pain and anguish, lol.

How many sites / what size system are you looking at? They grow super quick once those roots hit the water and can get big quick, so not a super long veg time I've noticed. I pretty much change out the water once a week and that's it. I check to make sure they are feeding and there are no crazy ph swings, that's about it. If you want it to be pretty much no touch, it takes a few items and some mechanical ability. I don't see any specific downfalls of undercurrent vs rdwc.

Newer build w/ the 8 gal buckets
View attachment 3795731
Nice set up. How fast top veg and how fast to flower?
 

rkymtnman

Well-Known Member
Veg for about 4 weeks or until roots are filling up tubs well. Normal flower times 60-75 days depending on strain.
hey schwarzwald,

weren't you the one that was switching over to HTH this run? if so, how goes it?

i think i'm about 1/500th done with my 1 pound bag. lol.
 

blackforest

Well-Known Member
hey schwarzwald,

weren't you the one that was switching over to HTH this run? if so, how goes it?

i think i'm about 1/500th done with my 1 pound bag. lol.
Yes, I have switched to hth from hydroguard. So far, so great. Easy to manage and roots are looking stellar. I'm going to flip them any day now, they got big fast. No ph swings or anything, very stable so far. The system is rocking out, super auto-pilot mode right now. Just change out the water once a week, fill the top off rez and that is it. Having the epicenter, air pump, water pump and in line filter on the outside of the tent is a huge plus because everything needs replacing when it's running 24/7 for months on end. I love the garden, just don't like having to do a lot of manual work in there lol.
 

rekoj0916

Well-Known Member
Guess I can run this setup this time and on the next go round try out an Undercurrent. That's only if I don't like how things go with this setup or growth isn't what I expect which I doubt it cause it's a hydro setup.
Doesn't seem like much of a difference between the two styles. Only issue I might foresee is the roots clogging your 1" lines.
I run an undercurrent cch2o system and am very fond of it. Plumb it to a gravity fed top off res that has a slightly stronger EC than the actual system and then just monitor the numbers. The plants grow quick, it's just nice not having to monitor individual plants and watching the system as a whole.
 

mike45214

Well-Known Member
Doesn't seem like much of a difference between the two styles. Only issue I might foresee is the roots clogging your 1" lines.
I run an undercurrent cch2o system and am very fond of it. Plumb it to a gravity fed top off res that has a slightly stronger EC than the actual system and then just monitor the numbers. The plants grow quick, it's just nice not having to monitor individual plants and watching the system as a whole.
That's what I'm after. As close to a set it and forget setup as possible (I do know that just leaving your plants for extended periods of time isn't possible if you don't want any problems.) Now days I'm all about working smart and not hard. I have thought about the return lines getting clogged and I think I'm going to use the material from water pump bags to try to keep that from happening.
My float valve is the only thing I need to install. I'll probably go looking for it today.
 

rkymtnman

Well-Known Member
(I do know that just leaving your plants for extended periods of time isn't possible if you don't want any problems
that's what i thought until i switched from rdwc to auto feed drain- to- waste hempy buckets. since then, i've gone on vacation for up to 12 days without a problem. pH and EC remain constant thanks to drain to waste.

i did have to give up the faster growth and slightly better yields of rdwc but i wouldn't go back knowing what i know now.
 

Petahet1111

Member
What type of current rdwc system did you recently setup? I built a diy undercurrent system, based of cch2o. I've never ran any other type of rdwc system though. I guess they are all rdwc's if they are simply recirculating the nutrients. I started with 5 gal round buckets and now have square 8 gal. Are you going to buy a cch2o system, or build your own? It can take a minute to build a complete system w/ chiller, epicenter, and top off rez, but once it's all setup, it's pretty much autopilot. I have a 6 site in a 4x8 tent with the epicenter on the outside so it's easy to drain/fill/add with a top off rez feeding the system so it stays at the same water level at all times, and hooked up to a bl guardian for ec/ph/temp. I probably should have just bought the kit from cch2o after all the pain and anguish, lol.

How many sites / what size system are you looking at? They grow super quick once those roots hit the water and can get big quick, so not a super long veg time I've noticed. I pretty much change out the water once a week and that's it. I check to make sure they are feeding and there are no crazy ph swings, that's about it. If you want it to be pretty much no touch, it takes a few items and some mechanical ability. I don't see any specific downfalls of undercurrent vs rdwc.

Newer build w/ the 8 gal buckets
View attachment 3795731
@blackforest: Nice! I'm putting together a similar system with only 2 of those buckets for now. I see you are using those black flexible connections between buckets. Any issues with those leaking and did you do anything other than tighten them down on the PVC? I'm sure they are cheaper than large unions.
 

TheChemist77

Well-Known Member
can u get a pick of the control buckets inside? so we can see how the pumps connected...id also like to see pix of an undercurrent and the pumps,,to see the difference between the 2.. thanks
 

mike45214

Well-Known Member
can u get a pick of the control buckets inside? so we can see how the pumps connected...id also like to see pix of an undercurrent and the pumps,,to see the difference between the 2.. thanks
If you comment was directed towards me it's too late cause I switched to an under current.
 
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