Starting a tank build -- have some noob questions

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Re: Starting a tank build -- have some noob questions

Postby Amit.. » Wed Apr 05, 2017 4:07 pm

arindam77 wrote:Another interesting method of tank assembly.
https://www.youtube.com/watch?v=cFWCXiHcwN8


Its a cool Jig, very clever if you have to work alone
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Re: Starting a tank build -- have some noob questions

Postby Amit.. » Wed Apr 05, 2017 4:13 pm

The assembly etc went quite allright, but the finished product has got novice stamped all over it.
Posting some pics of the prepping.

I've good part of the day scraping the smudges and still on it.
A word of advice for the 1st timers, cover up as much of the glass as possible, Will cause you less pain later on.

I'll post the glued glasses picture once i am done with polishing, If i post the picture as it is now, it will be discouraging for newbies. :)
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Re: Starting a tank build -- have some noob questions

Postby Amit.. » Wed Apr 05, 2017 4:15 pm

arindam77 wrote:moving bed and sponge filters are the best filters, but we are habituated to think costlier is more efficient. How many of us take full advantage of smart phones, but we all have at least 1 in our pocket, some doesn't fit in pockets too.
Don't know about handling 100 gallons, but they are very efficient. I once tried to build one moving bed sand filter, but it had design flaws, as the cheap power heads don't provide a constant pressure.



Does the sand really have to move that fast as they show in YT. I mean, as long as it shuffling, shouldn't it allright?
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Re: Starting a tank build -- have some noob questions

Postby arindam77 » Wed Apr 05, 2017 5:10 pm

Congrats, for the first build.I think it's the sump. So, how thick is the glass ? Seems too thick.
Pondguru's moving bed filter doesn't move that much, it's like shivering. Though the media is different.
https://www.youtube.com/watch?v=BwNhEvouMDw
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Re: Starting a tank build -- have some noob questions

Postby Amit.. » Wed Apr 05, 2017 5:33 pm

arindam77 wrote:Congrats, for the first build.I think it's the sump. So, how thick is the glass ? Seems too thick.
Pondguru's moving bed filter doesn't move that much, it's like shivering. Though the media is different.
https://www.youtube.com/watch?v=BwNhEvouMDw



Thanks, Yeah you guessed right, its the sump. I've used 8 mm saint gobain extra clear glass for the sump.
I am sure that i could have gotten away with 6 mm, but just playing safe here, keeping some room for beating.
There is no way i could justify why i got the extra clear glass for the sump, when its going to be tucked away under the table all the time.
Guess was just being whimsical.

As for the media. I guess if i could get the water moving through the sand bit evenly and as long as the particles are bumping into each other, they should be able
to scrape the old bacteria film off each other. I mean it doesn't really have to be at supersonic speed, do they?
Your thoughts.
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Re: Starting a tank build -- have some noob questions

Postby arindam77 » Wed Apr 05, 2017 6:30 pm

Moving bed filters don't restrict water flow, and does nothing for mechanical filtration. So, the sand has to be suspended, and in my experience, moving the sand slowly is very difficult. It's like, not moving> more flow>not moving >more flow>started jumping>reduce flow>not moving (again). It's like Pass-Fail, nothing in between.
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Seams on the sump tank

Postby Amit.. » Thu Apr 06, 2017 8:44 am

This is how the seams turned out to be, not sure if it can be seen clearly in the picture.
However, there is a gap between the glasses of approx 1mm filled with silicon and has hardened now. But will wait
for another 48 hrs before i fill it up to do leak test.
Also need to fill the gaps left by the spacers.
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Re: Starting a tank build -- have some noob questions

Postby Amit.. » Thu Apr 06, 2017 8:46 am

The tank after the removing the silicon smudges and a bit of polish

I'll post a picture of the seam, once i fill up the spacers gap with silicon.
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Re: Starting a tank build -- have some noob questions

Postby arindam77 » Thu Apr 06, 2017 9:35 am

Seems you made a mistake, silicone is not to be injected while the spacers are in position.
You should have made like point soldering with silicone while the spacers are in position, around 1 foot apart, then let the points cure, then remove spacer, trim the excess silicone at the points soldered/ joined both inside and outside and then inject silicone along the whole seam.
And you should put the tape at narrower margin, so that less silicone is visible.
Now, i see why there was mess with silicone.
Anyway, it's the sump. Better luck next time. I will try to draw a image showing steps, if time permits.
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Re: Starting a tank build -- have some noob questions

Postby arindam77 » Thu Apr 06, 2017 11:57 am

EDIT : Pic removed as the diagram was faulty.
Last edited by arindam77 on Fri Apr 07, 2017 3:45 am, edited 2 times in total.
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