Skimming in a Barebottom tank.

[NoSchwag]

elephen how about an email address? I'll yousendit.com it to ya.

14 MB maybe you can compress it a little or something.

The quaility is horrible too.

[NoSchwag]

wait, let me make a smaller one.

[NoSchwag]

here you go guys..

http://s56.yousendit.com/d.aspx?id=1...Z35ACSYLRUKTW6

elephen if it's possible, can I send you a link once I clean my skimmer up real nice and figure out how to make it brighter?

[NoSchwag]

here's a pic.



The thick column of tiny bubbles starts right where the top riser meets the bottom riser (at the very bottom of the quick release)

ALL of the tiny bubbles move up wards quickly and pop at the very top.

The only part that needs wiping often is the top lip. No other part of the skimmer gets a brown sludge.

[Geoff]

Originally Posted by three90s&125sump

I think the entire point of having the recirc pump is to have slow flow (feed pump 400 GPH) with a small skimmer( 24 inches tall X 12 Inch Daiameter) and a huge dwell time (3 recirc needle wheel pumps 700GPH X 3). With a set up like that I think it would be quite possible to have the effieciency of the skimmer be equal to that of a skimmer that is 10 feet tall with a diameter of 12 inches flowing 2100GPH through it.

If there were some way to compartmentalize the chamber into 3 or 4 seperate chambers with it own dedicated recirc pump and a graduated method of feeding each one as to be sure that all the water entering the next chamber would have have at least 80% dwell time in the previous chamber, I could see the water coming out of the final chamber 99% devoid of all DOCs and particulates.

I think they are very efficient at skimming but I think the feed rate of the skimmer is its limiting factor. For example : My return pump is pumping 2600 GPH through it. That means with each pass through the skimmer the above mentioned hypothetical skimmer would only process 15% of the water entering the sump. That means it is missing 85 percent of the DOCs with each tank cycle now a skimmer that is processing 2600 GPH but is only 50 percent efficient at removing DOCs would still be removing 35 percent more than the recirc skimmer. I have to cut this short, I'll be back later if anyone want to comment now.

you are saying exactly what i am trying to get at. with every recirc pump you add you are actually lowering the total amount of water processed. if that same skimmer was made with a single feed pump rated to what all three of those other pumps were you would be doing the exact same thing only processing a boatload more water through the skimmer. those recirc pumps are just making the water faster without any real benefit, at least in my thinking.

G~

[redwinger]

G, The purpose of the recirc needlewheels is to make the bubbles as small as possible. By intakeing allready bubbleing water injecting it with more air and then the needlewheel hits it chopping it into even smaller bubbles. We all know that smaller bubbles have more contact area than larger ones. By haveing a smaller GPH feed pump you are allowing those bubbles to be chopped up even more than if you have a larger GPH feed pump. To many gph running through the skimmer (feed pump wise) and you are not getting the full benefit of the recirculating needlewheel pumps.

[three90s&125sump]

If the bubbles get to be too small then they will just desolve back into the water re-depositing the organics back as well.


Right Geoff, but for an under the tank in-sump skimmer that is on a tank with a sump flow of 400 GPH you can't beat it.

[redwinger]

Originally Posted by three90s&125sump

If the bubbles get to be too small then they will just desolve back into the water re-depositing the organics back as well.


Right Geoff, but for an under the tank in-sump skimmer that is on a tank with a sump flow of 400 GPH you can't beat it.

You show me a pump on the market that can even come close to what you are describing

[three90s&125sump]

I'm not saying that is the case just stating a fact. I know very little about recircs and everything I have said is just based on the small bit of info I have received here.

[Geoff]

Originally Posted by redwinger

You show me a pump on the market that can even come close to what you are describing

throw an eductor on a Velocity T1.

ok, i know, it is not in sump, but it qualifies for the rest of the criteria.

G~

[redwinger]

Originally Posted by Geoff

throw an eductor on a Velocity T1.

ok, i know, it is not in sump, but it qualifies for the rest of the criteria.

G~

How does an eductor vaporize bubbles?

[Geoff]

Originally Posted by redwinger

How does an eductor vaporize bubbles?

if you ever put an eductor anywhere near the surface of the water it will inhale air creating a massive bubble storm in the tank. about the same as putting a Tunze near the surface of the water upside down.

my next skimmer will actually be an eductor driven skimmer. eductors are just a higher pressure version of a Beckett.

G~

[NoSchwag]

Did you guys check out the video?

Is this how you guys are running your skimmers in your BB tanks? I will make a better one and upload it today

[elephen]

Originally Posted by NoSchwag

elephen how about an email address? I'll yousendit.com it to ya.

14 MB maybe you can compress it a little or something.

The quaility is horrible too.

matt@elephen.com

[elephen]

Originally Posted by Geoff

if you ever put an eductor anywhere near the surface of the water it will inhale air creating a massive bubble storm in the tank. about the same as putting a Tunze near the surface of the water upside down.

my next skimmer will actually be an eductor driven skimmer. eductors are just a higher pressure version of a Beckett.

G~

Out of curiousity how do you plan on having an eductor driven skimmer? I run 2 3/4" eductors on 1 closed loop in my tank powered by a Pan World 150-PS and holy crap they move water. After pipe friction and head loss I calculated its moving roughly 3300-3400gph depending on how the pump is throttled back. 7gpm per eductor x 4 = 28gpm per eductor. 2 eductors = 56gpm. 56gpm x 60 = 3360GPH.

Eductors are powerful but I'm not sure how you could create a housing similar to a beckett and have it work consistently. Maybe something almost identical to a beckett housing but with an eductor instead of a foam head inside of it.