FSD 2" Boka

Reflux still design and discussion

Re: FSD 2" Boka

Postby RobMichelle » Mon Jan 19, 2026 6:06 am

I just plonked mine on bottom. When you get the pump you will see the pump is set up into the housing. Mine doesn’t move around just sits there.
RobMichelle
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equipment: Airstill, FSD 2” PotStill, 35ltr digiboil , 3x30ltr fermenters, 2x110 ltrstainless steel fermenters, 1000ltr ibc for recirc water & 350w ozito dirty water pump.

Re: FSD 2" Boka

Postby Dougly » Wed Jan 21, 2026 6:50 pm

Hi Rob,
Finally finished tanks.I just went ahead and suspended pump a couple inches from bottom but that can change i suppose. the pump does seem to not move around. and nice and quiet.
350 watt ozito pump doesn,t seem to have the pressure to push through reflux coil FSD 2 inch boka only getting outpput of 1200ml /minute, don,t think that is enough, using all 12 mm hose fittings,tried direct to pump with return to tank and also with relief hose back into tank. will do feints run to see, always something Ay, might have to change to copper coil or get a bigger pump.GRRRR :angry-banghead:
Dougly
 
Posts: 15
Joined: Mon Dec 15, 2025 5:10 pm
equipment: pure distill,
pure distill product condenser
2 inch FSD boka
2000 wattt single elment 30 lt boiler
FSD 2inch pot still
FSD product condenser
parrot

Re: FSD 2" Boka

Postby RobMichelle » Wed Jan 21, 2026 6:57 pm

I’m pretty sure Carol who started this thread runs the same pump, go back to the first page, have a read maybe first couple but carol did do a great write up.
RobMichelle
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Posts: 269
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Location: Horsham vic
equipment: Airstill, FSD 2” PotStill, 35ltr digiboil , 3x30ltr fermenters, 2x110 ltrstainless steel fermenters, 1000ltr ibc for recirc water & 350w ozito dirty water pump.

Re: FSD 2" Boka

Postby Dougly » Wed Jan 21, 2026 8:51 pm

Hi Rob will do thanks
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Posts: 15
Joined: Mon Dec 15, 2025 5:10 pm
equipment: pure distill,
pure distill product condenser
2 inch FSD boka
2000 wattt single elment 30 lt boiler
FSD 2inch pot still
FSD product condenser
parrot

Re: FSD 2" Boka

Postby howard » Thu Jan 22, 2026 11:48 am

Dougly wrote:Hi Rob,
Finally finished tanks.I just went ahead and suspended pump a couple inches from bottom but that can change i suppose. the pump does seem to not move around. and nice and quiet.
350 watt ozito pump doesn,t seem to have the pressure to push through reflux coil FSD 2 inch boka only getting outpput of 1200ml /minute, don,t think that is enough, using all 12 mm hose fittings,tried direct to pump with return to tank and also with relief hose back into tank. will do feints run to see, always something Ay, might have to change to copper coil or get a bigger pump.GRRRR :angry-banghead:

i've used that pump for years and had no problems pushing through a 2 x 2" shottie condensers, one reflux and one PC.
and it it has about a 30m travel from the pool and back, with a rig height of about 2.4m, with 12mm hoses.
pump reckons it's 7000L/hour but 12mm hoses restrict that.
having said that, heaps of folk use this pump without any problems

i suspend my pump in the pool so it's about 800mm off the bottom.
the rope did break once and sucked a load of shit and leaves into the system.
there was loads of mascerated leaves stuck in every conceivable section of the hose, valves and condensers.
took me hours to strip everything and wash it out.
Last edited by howard on Thu Jan 22, 2026 11:51 am, edited 1 time in total.
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Re: FSD 2" Boka

Postby Buj » Thu Jan 22, 2026 12:30 pm

Hi Doug,
I first thought maybe the Ozito 350w wasn't enough but it proved me wrong.
With 20m of hose from tank to stills, and return, it's fine. It even handles the 4" Neutralizer Condensers well.
I also suspend the pump a foot off the bottom of my large tank as it does get a bit of leaf/dirt debris on the bottom, even with a screen covering.
I use a cheap kayak strap, adjustable, and place a piece of timber over the top of the tank to support it.
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FSD 4" Neutralizer 'Kommet'
FSD 2" Boka Reflux 'Khey'
FSD 2" Pot Still 'Kob'
FSD 50lt Milk Can Boiler
30L Boiler

Re: FSD 2" Boka

Postby Dougly » Sat Jan 31, 2026 7:01 pm

Barrel Tanks poly fittings.jpg
Hi Guys Thanks for responses.
hey Buj i Built tanks with poly fittings as you suggested, thanks worked perfectly.
hi howard I have had trouble getting good flow via pump ok on mains. so much resistance in coil, i,m thinking.In the end i drilled out the internal dregs from the pipe welds of where they join into hose fittings.
I did tpw spirit run on sunday before i realised to drill, i used a 550 watt pump as ozito was about 1000 l/Min and it was hot day. i Got 1200l/M with 550
watt submersible pump. 6 hours later everything got damn hot, but it survived, that was a good thing in worse case. had to do then as i am going away for a few weeks . great product reasonably happy came out at 90 % abv
Did another test today after reaming out coil pipe and got 1200 L/M on ozito pump which should be ok when water temp is cool on a cold day i Think.
Got 1700 L/M with 550 pump which by the way is Bianco Pumpz BIA-JH550B. So I might use bianco for reflux aspirit runs and ozito pump for pot still, thanks All for putting with my problems i,ll see yo all in afew weeks
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Dougly
 
Posts: 15
Joined: Mon Dec 15, 2025 5:10 pm
equipment: pure distill,
pure distill product condenser
2 inch FSD boka
2000 wattt single elment 30 lt boiler
FSD 2inch pot still
FSD product condenser
parrot

Re: FSD 2" Boka

Postby Buj » Sun Feb 01, 2026 12:22 pm

Hi Doug, what was your set voltage on the power controller?
135v is my average, from all of my notes. My RC is not that hot at the top. Can hold my fingers against the top. The bottom of the RC is hot to touch though.

I also collect at 250ml/18mins on average.
Buj
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Posts: 89
Joined: Sun Aug 04, 2024 5:17 pm
Location: Brisbane Bayside
equipment: -
FSD 4" Neutralizer 'Kommet'
FSD 2" Boka Reflux 'Khey'
FSD 2" Pot Still 'Kob'
FSD 50lt Milk Can Boiler
30L Boiler

Re: FSD 2" Boka

Postby Dougly » Sun Feb 01, 2026 3:29 pm

Hi Buj.
I had mine on 200 volts. I could hold on top of the rc coil and like you and not the bottom it was hot day. I.m sure with the ozito imight have had problems as the water temp was a out 30 degrees before starting. I used the 550 watt pump for safety net.
The ozito fairdinkum I could wee just as good.
I tried to swap at bunings ozito for 720 watt version of pump it they wouldn,t refund.
After drilling out pipe tubes I think I might be able to use ozito on a cool day I think.
Next time i.ll try lower voltage on power controller. Mine is not FSD.controller tho.
Will be about 2 months before next. Attempt i.m away down East Gippsland trying to have a.
A .mild summer. Talk soon again thanks for replies
Dougly
 
Posts: 15
Joined: Mon Dec 15, 2025 5:10 pm
equipment: pure distill,
pure distill product condenser
2 inch FSD boka
2000 wattt single elment 30 lt boiler
FSD 2inch pot still
FSD product condenser
parrot

Re: FSD 2" Boka

Postby howard » Sun Feb 01, 2026 7:10 pm

Dougly wrote:Hi Buj.
I had mine on 200 volts. I could hold on top of the rc coil and like you and not the bottom it was hot day. I.m sure with the ozito imight have had problems as the water temp was a out 30 degrees before starting. I used the 550 watt pump for safety net.
The ozito fairdinkum I could wee just as good.
I tried to swap at bunings ozito for 720 watt version of pump it they wouldn,t refund.
After drilling out pipe tubes I think I might be able to use ozito on a cool day I think.
Next time i.ll try lower voltage on power controller. Mine is not FSD.controller tho.
Will be about 2 months before next. Attempt i.m away down East Gippsland trying to have a.
A .mild summer. Talk soon again thanks for replies


the picture above with the drill, is that your reflux condenser?
i'm still not convinced the pump is your problem.
if you let the ozito 350w rip without any hose connections, i reckon it will shoot water near their 116L/minute.
i would be removing the hose connections at different points to find what piece of hose or equipment is causing the restriction.
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Posts: 547
Joined: Fri Jul 17, 2020 12:53 am
Location: perth
equipment: 35l brewzilla
2" modular CM
gin caddy
changeover element switch and voltage controller on brewzillas 1900w element.
5L glass boiler/glass leibig

Re: FSD 2" Boka

Postby Buj » Sun Feb 01, 2026 11:37 pm

Dougly wrote:Hi Buj.
I had mine on 200 volts.


I've never run the Boka that high after heat up, and during reflux.
At 135v I maintain 78° on the probe for most of the run, until early tails when it bumps up.
No need to push the boil that much harder.

My tank water is about 30°+ as well, in the summer.
Buj
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Posts: 89
Joined: Sun Aug 04, 2024 5:17 pm
Location: Brisbane Bayside
equipment: -
FSD 4" Neutralizer 'Kommet'
FSD 2" Boka Reflux 'Khey'
FSD 2" Pot Still 'Kob'
FSD 50lt Milk Can Boiler
30L Boiler

Re: FSD 2" Boka

Postby Dougly » Mon Feb 02, 2026 3:03 pm

Hi Howard,
Yes it is the reflux still I,m drilling, seems to have made a difference but won,t find out until I return in march. when I do a distilled water test.
You could be on the money with fittings will check them for restriction. I read somewhere I think from a guy called hookline form memory, that a 1000 L/m is sufficient on a coil at 150 mm in length, with 6.4 mm (1/4 inch) thick tubing at 2400 watts and FSD coil is longer than that and same dia, pipe, so should be Ok '
Thanks for the hints, much appreciated.

Hi Buj,
I did try your suggestion 140 volts and, drip drip dribble almost stopped flowing to barely a drip, so my conclusion we have different brands power controller,
Thats why I ran at 200 volts, and stayed at 77 degrees for 5 to 6 hours.
I will see how far down the volts scale I can go, I will take amps reading and convert to watts to see what is going on. Read somewhere on this forum to run at 1800 watts so that will be my data/ starting point after initial full power. l also i might have a shit controller. mines not FSD
My tank water was 30 degrees also when I started, with 550 watt pump in use, the return water hose outlet was nearly 50 degrees after 5 to 6 hours and was still able to touch top of reflux coil but not further down. it was very very warm bordering hot to touch. with no vapor, (mirror Test) my reflux water return line from reflux coil at tank was above 45 degrees.

Again thanks for the Hints Guys talk soon. :angry-banghead:

Drinking TPW on this trip it much better than turbo, great forum Love it
Lifes Good. keep it up all.
Dougly
 
Posts: 15
Joined: Mon Dec 15, 2025 5:10 pm
equipment: pure distill,
pure distill product condenser
2 inch FSD boka
2000 wattt single elment 30 lt boiler
FSD 2inch pot still
FSD product condenser
parrot

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