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Top feed bottom flow RDWC

Stonefree69

Veg & Flower Station keeper
Veteran
Here's a pic of my current hydro design I'm upgrading this week. Don't want to use the name "undercurrent" as that obviously is a commercial hydro system name & this is my emulation (not exactly copy). Instead of bottom flow I could say bottom current too but my diagrams say "water flow direction" so I'll stick with that.

The 6 5 gallon buckets are in the veg stage arrangement which will switch to a 24 sq ft hexagon arrangement for stacked vertical bare bulb in flower (1,200 watts) but stick with the same design. In early veg the circulation pump is less important though and possibly just top feed pump could be used (along with lower water/nute levels).

I'm also incorporating a 4 section shelf with res & chiller on bottom & 5 gallon bucket with a 20 gallon tub w/ball valves for both topping off res with pH adjusted water & nute changes respectively. Could also incorporate a float in the res to keep water levels steady & keep premixed nutes in 20 gallon tub.

First pic is of the top feed design part and 2nd pic is of the bottom or reverse flow design (it's all in the same hydro setup, like parts A & B):

Top_feed_bottom_current_3_001.jpg


Top_feed_bottom_current_3_004.jpg


Not included: water level indicator which is just a 1/2" vertical tube (blue in color to inhibit algae) connected to 2 1/2" elbows in the bucket on top & bottom. One at each end of the row of buckets. If your picky or concerned about algae just cover with Velcro tape squares & Panda film. Also a 1" elbow on circulation pump in diagram 2 that goes before the waterfall to res. The top feed has a 3/4" flex hose coming from Uniseal on bottom res to fit right in.

Also have 4'x8' foot Orca grow film panels which keep the grow perimeter and reflect back a lot of light from the bulbs. I use shims to keep and put them in place. They are 1 1/2" thick foam board with reflective foil backing. I cut out vent holes in top and bottom centers on each one, 1' high x 2'wide.

Any input will be greatly appreciated. You members have already helped out tremendously and doubt I'd have 1/2 the ideas here. :thank you:
 
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Craven_au

Active member
I don't like the bottom flow idea if i have it right. Are you planning to have the nutrients flow out at the bottom of the buckets back to the rez if you are i wouldn't recommend it as roots and things can course blockages if the return lines are to small reducing flow back to the rez it could course an overflow. To be safe use at least a 2'' return line at the bottom of the buckets or a 1'' return line/PVC pipe inline or just below the net pots not at the bottom should be fine.

Any blockage in a signal return line would be disastrous.

This should help you out
https://www.icmag.com/ic/picture.php?albumid=27779&pictureid=720781 (I like this one)
https://www.icmag.com/ic/showthread.php?t=218673
https://www.icmag.com/ic/showthread.php?t=267178
https://www.icmag.com/ic/picture.php?albumid=47573&pictureid=1111015
https://www.icmag.com/ic/showthread.php?t=155064&highlight=rdwc
https://www.icmag.com/ic/picture.php?albumid=13493&pictureid=274266
 

Stonefree69

Veg & Flower Station keeper
Veteran
I don't like the bottom flow idea if i have it right. Are you planning to have the nutrients flow out at the bottom of the buckets back to the rez if you are i wouldn't recommend it as roots and things can course blockages if the return lines are to small reducing flow back to the rez it could course an overflow. To be safe use at least a 2'' return line at the bottom of the buckets or a 1'' return line/PVC pipe inline or just below the net pots not at the bottom should be fine.

Any blockage in a signal return line would be disastrous.

This should help you out
https://www.icmag.com/ic/picture.php?albumid=27779&pictureid=720781 (I like this one)
https://www.icmag.com/ic/showthread.php?t=218673
https://www.icmag.com/ic/showthread.php?t=267178
https://www.icmag.com/ic/picture.php?albumid=47573&pictureid=1111015
https://www.icmag.com/ic/showthread.php?t=155064&highlight=rdwc
https://www.icmag.com/ic/picture.php?albumid=13493&pictureid=274266
Thanks Craven, nice links. For a 5 gallon bucket and a 12" diameter the biggest diameter hole you can make with either Uniseals or bulkheads is for 1" diameter tubing or pvc. I've grown trees that brushed my 8' ceilings (6' 8" net height) and never had a root clogging issue and this was from 3/4" tubing.

The last 3 pics you showed is the same "Undercurrent" design concept just like mine or "bottom flow" coming from buckets going to waterfall in res. If those pvc pipes are > than 1 inch w/no leaks that would be new to me... UC is already very popular, I'm just adding top feed, ditching air stones & adding a chiller & powerhead venturi pump in res for helping w/dissolved oxygen.

I DO plan for my flower station to upgrade to 12.5 gallon Igloo coolers & 3" pvc pipe. Veg station go with 5 gallon coolers and 1" pvc.
 

Snype

Active member
Veteran
Thanks Craven, nice links. For a 5 gallon bucket and a 12" diameter the biggest diameter hole you can make with either Uniseals or bulkheads is for 1" diameter tubing or pvc. I've grown trees that brushed my 8' ceilings (6' 8" net height) and never had a root clogging issue and this was from 3/4" tubing.

The last 3 pics you showed is the same "Undercurrent" design concept just like mine or "bottom flow" coming from buckets going to waterfall in res. If those pvc pipes are > than 1 inch w/no leaks that would be new to me... UC is already very popular, I'm just adding top feed, ditching air stones & adding a chiller & powerhead venturi pump in res for helping w/dissolved oxygen.

I DO plan for my flower station to upgrade to 12.5 gallon Igloo coolers & 3" pvc pipe. Veg station go with 5 gallon coolers and 1" pvc.
Not sure if you know but I have a tutorial in my signature for RDWC and I use 1.5" PVC with 5 gallon buckets. I thought you said it cant be done but heres some pics:
picture.php
picture.php
picture.php
picture.php
 

Stonefree69

Veg & Flower Station keeper
Veteran
Not sure if you know but I have a tutorial in my signature for RDWC and I use 1.5" PVC with 5 gallon buckets. I thought you said it cant be done but heres some pics:
View Image View Image View Image View Image
Thanks Super Snype! :D I was thinking of 1" Uniseals which are basically foolproof too. I see you use 4.5" of 1.5" pvc & 1.5" Male 2 PVC Trap Adapters (Nibco) w/neoprene washers & female adapters to connect your buckets.

I haven't shopped yet but I think I'm gonna go with your idea and use the 1.5" pvc. I heard about that "bulkhead trick" before using pvc adapters, only didn't think it would work with 1.5". For s**t's & giggles I'm gonna try some 1.5" Uniseals on a few buckets. Hopefully I can just slide in a 6-8" section of 1.5" pvc to connect buckets.

Same as you exactly for veg: each site takes up 16" square. ;)


EDIT: did some research and indeed some growers having no leaks or problems with 1.5" Uniseals on 5 gallon round buckets. AND you have to drill a 2.5" pilot hole too! A 4"x4" piece of wood with diameter slightly less than bucket with side to drill should help you drill a round hole. This could help prevent leaks.
 
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Snype

Active member
Veteran
Thanks Super Snype! :D I was thinking of 1" Uniseals which are basically foolproof too. I see you use 4.5" of 1.5" pvc & 1.5" Male 2 PVC Trap Adapters (Nibco) w/neoprene washers & female adapters to connect your buckets.

I haven't shopped yet but I think I'm gonna go with your idea and use the 1.5" pvc. I heard about that "bulkhead trick" before using pvc adapters, only didn't think it would work with 1.5". For s**t's & giggles I'm gonna try some 1.5" Uniseals on a few buckets. Hopefully I can just slide in a 6-8" section of 1.5" pvc to connect buckets.

Same as you exactly for veg: each site takes up 16" square. ;)

Fuck the uniseals! Even on square buckets they suck. I used them 1 time and knew that I needed another option. Some of them leaked although it was minor so I switched to 1.5" trap adapters. The washers didnt exist to my knolwledge so i had thousands of them manufactured after I made the design. If you have a problem finding washers that work, you can find them in my thread. The store that I gave them too might of already sold out of them but in a week I will have someone stop by the store and drop off a couple thousand more washers.
 

Stonefree69

Veg & Flower Station keeper
Veteran
Fuck the uniseals! Even on square buckets they suck. I used them 1 time and knew that I needed another option. Some of them leaked although it was minor so I switched to 1.5" trap adapters. The washers didnt exist to my knolwledge so i had thousands of them manufactured after I made the design. If you have a problem finding washers that work, you can find them in my thread. The store that I gave them too might of already sold out of them but in a week I will have someone stop by the store and drop off a couple thousand more washers.
Thanks Snype, I'll check out the store you supply with those neoprene washers. It seems for 1.5" Schedule 40 pvc pipe the OD is 1.9" or 1 7/8" - or same thread (or OD) diameter on 1.5" Female PVC Trap Adapter (Nibco).

For $1.98 each, Lowes has these: 2-15/16-in Rubber Washer

2-15/16" OD x 1-7/8" ID
3/8" thick
Rubber construction
 

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