Questions about a DIY RDWC setup

Eric Farley

Active Member
I've been growing with DWC for about a year now and I'd really like to upgrade to a RDWC setup so it's a little easier to manage since I'm lazy and daily check-ins aren't happening like they should. Anyways I've done some reading on various systems and looked at some off the shelf solutions and in the end decided a DIY was the right way to go.

One thing I noticed when looking at other systems/builds was they most people have the inlet at the top of their bucket above water level and the drain at the bottom of the bucket. To me this seems problematic for a couple reasons, first the roots seem like they would almost certainly grow and be sucked into the drain, eventually blocking it as the roots take up more space. Second if the drain were to get blocked by the roots or anything else the bucket would quickly overfill and flood all over the floor, which would obviously be bad...

What are your experiences with these concerns? Have you had you system overflow and flood the floor? Do the roots grow into the drain? How do you deal with that; do you have to monitor it and pull the roots out of the drain as needed or do you use some kind of screen to block the drain?

I have been thinking instead of dealing with those issues that I'd flip the system and have my inlet at the bottom of the bucket and my drain at the top. This would make it impossible for the roots to be pulled into the drain and the system would be much less likely to overflow since the drain works on the same idea as a bathtub or sink overflow drain in that any excess water above a desired level is drained.

Has anyone tried a setup with the inlet at the bottom and the drain at the top; how did it work and did you run into any issues? Does anyone know why you don't see this idea in more systems, is it flawed in some way?
 

WeedFreak78

Well-Known Member
I like it, but there's a couple issues I see. First, I'd suggest multiple overflows at the same level with some sort of screen/ filtration. Roots plugging them will still be an issue. You might need to add aeration, the higher feed lines created a waterfall aeration in each bucket which you won't be getting. You could always run a riser inside the bucket so it still pumps above the water line. I'm stealing this idea.
 

blackforest

Well-Known Member
I've been growing with DWC for about a year now and I'd really like to upgrade to a RDWC setup so it's a little easier to manage since I'm lazy and daily check-ins aren't happening like they should. Anyways I've done some reading on various systems and looked at some off the shelf solutions and in the end decided a DIY was the right way to go.

One thing I noticed when looking at other systems/builds was they most people have the inlet at the top of their bucket above water level and the drain at the bottom of the bucket. To me this seems problematic for a couple reasons, first the roots seem like they would almost certainly grow and be sucked into the drain, eventually blocking it as the roots take up more space. Second if the drain were to get blocked by the roots or anything else the bucket would quickly overfill and flood all over the floor, which would obviously be bad...

What are your experiences with these concerns? Have you had you system overflow and flood the floor? Do the roots grow into the drain? How do you deal with that; do you have to monitor it and pull the roots out of the drain as needed or do you use some kind of screen to block the drain?

I have been thinking instead of dealing with those issues that I'd flip the system and have my inlet at the bottom of the bucket and my drain at the top. This would make it impossible for the roots to be pulled into the drain and the system would be much less likely to overflow since the drain works on the same idea as a bathtub or sink overflow drain in that any excess water above a desired level is drained.

Has anyone tried a setup with the inlet at the bottom and the drain at the top; how did it work and did you run into any issues? Does anyone know why you don't see this idea in more systems, is it flawed in some way?
DIY Undercurrent system. Use square buckets and 2" pipes. No clogged drains, no overflow issues. I change the water once per week and that's pretty much it. The control bucket is on the outside of the tent and it's hooked up to a simple top off rez. Water level stays the same all the time hooked up to a blue lab guardian. I've been running a 6 site in my 4x8 for quite some time. I'm going to remove 3 buckets and just make it a 3 site in a 4x8 because having 6 in there it just gets way too big and way too out of control. Can easily fill the same space with 1/2 the plants.

This photo was from awhile ago. They are huge nowand take up the entire tent. Harvesting in a couple weeks. Good Luck!
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Eric Farley

Active Member
DIY Undercurrent system. Use square buckets and 2" pipes. No clogged drains, no overflow issues. I change the water once per week and that's pretty much it. The control bucket is on the outside of the tent and it's hooked up to a simple top off rez. Water level stays the same all the time hooked up to a blue lab guardian. I've been running a 6 site in my 4x8 for quite some time. I'm going to remove 3 buckets and just make it a 3 site in a 4x8 because having 6 in there it just gets way too big and way too out of control. Can easily fill the same space with 1/2 the plants.

This photo was from awhile ago. They are huge nowand take up the entire tent. Harvesting in a couple weeks. Good Luck!
View attachment 3842796
I also had to cut down on how many plants I grow because of the size. I run a 4x4 tent and I started with 4 plants, I'm now down to two plants and I've done a single plant in there and even that was able to fill the space without issue.

It looks like you're running rigid PVC pipe between sites, how do you get the lines in/out of the tent? I can't think of a way to do it other than to run the hoses through the holes the air intakes use, but that requires a flexible hose and they are a PITA to find a 2" flexible hose.
 

blackforest

Well-Known Member
I also had to cut down on how many plants I grow because of the size. I run a 4x4 tent and I started with 4 plants, I'm now down to two plants and I've done a single plant in there and even that was able to fill the space without issue.

It looks like you're running rigid PVC pipe between sites, how do you get the lines in/out of the tent? I can't think of a way to do it other than to run the hoses through the holes the air intakes use, but that requires a flexible hose and they are a PITA to find a 2" flexible hose.
I just cut holes below the zipper line of the tent for each pipe/tube. I took careful measurements and made 3 cuts total. 2 pvc and the 3/4 return line. Put some black duct tape around it and sealed it just fine. I used to have the control bucket on the inside of the tent and what a relief to have the control bucket, air pump and water pump on the outside. Easy to change anything out and control.

Took these pics just now...

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