Algae Scrubber Basics

My wife had some extra canvas laying around for doing art projects. (Which she started and never finished). So I have no idea what the thickeness of the canvas is. It fits fairly well into my spray bar, but given my uneven cut, it takes some rocket scientry to get it back into place.

That could be the problem, and I suspect it might be. Easy enough to measure with a tape measure though. You really shouldn't have any squirting with a brand new screen, I suspect that the uneven slot is the culprit there.

How big is your screen?

The plastic canvas you get at sewing stores is usually the same thickness, but you can get #10 and #7, and probably others, and usually the bigger the # the bigger the hole. #10 is useful for making flow-through enclosures by the way, but is a little too big for ATS use.
 
Totally agree, the screen is just the right size for my tank actually. Maybe slightly small, but, it's 9.5" X 13" When I replace the screen I'll consider 10 X 14". My enclosure is 15" long, I can handle the 14" (I designed it for 14" long).

BUt I don't have more than 130 gallons of water flowing the tank. It's a 125g. With 30 gallon sump with close to 100 lbs of sand between the display and sump and around 80-100 lbs of rock between the sump and display. Plus the sump is only half full. So, I'd be surprised if I'm over 110-120 gallons of actual water volume.

One question. When you're swapping screens (assuming they wear out, etc.. Do you run 2 together for a while or do you just start one brand new, maybe rub some algae from the old one on the new one? I'm thinking of picking some new ones up this weekend when I dremel the pipe out some. I just was wondering how others start replacement screens?


PIcture of my screen as of today:

<a href="http://s569.photobucket.com/albums/ss134/SchnauzerWauzer/Saltwater%20Aquarium/Sump/?action=view&current=2011-03-30_17-35-43_558.jpg" target="_blank"><img src="http://i569.photobucket.com/albums/ss134/SchnauzerWauzer/Saltwater%20Aquarium/Sump/2011-03-30_17-35-43_558.jpg" border="0" alt="Photobucket"></a>

<a href="http://s569.photobucket.com/albums/ss134/SchnauzerWauzer/Saltwater%20Aquarium/Sump/?action=view&current=2011-03-30_17-35-29_790.jpg" target="_blank"><img src="http://i569.photobucket.com/albums/ss134/SchnauzerWauzer/Saltwater%20Aquarium/Sump/2011-03-30_17-35-29_790.jpg" border="0" alt="Photobucket"></a>
 
That looks like the correct #7 mesh (I think it's #7...I'll have to check when I get home - second guessing myself). I think the problem is your slot tube is not straight and even. Screen looks like it's off to a good start though.

As for the screen wearing out, as long as you don't wrench on it really big time when cleaning, it should last a very long time. I'm on 6 months and no sign of any problems with tearing, etc. So I wouldn't worry about it.

As for a new screen, there isn't really a way to jump-start it. Read back a few days where it is discussed (someone had a screen die from a power outage) same thing applies. But starting it by zip-tying to an existing screen will keep a nutrient spike away.
 
I asked earlier what size those compact fluorescents are on the screen, didnt see the answer.

A question on whether to put a timer on or run the ATS 24/7. Need to figure that on what size plugin to use.

I have heard both ways, run the water over it 24/7, run the lights on a timer while water runs, or cut off lights and water for awhile each day. It makes sense to me to only put the lights on a timer.

Comments?
 
water flow and timing

water flow and timing

Thanks guys, keep me straight, :beer:

I got the stock tank, the acrylic for the dividers came in and going to get the pvc for the frame today, hopefully it'll be functioning next week. So will pick up the timer too.
 
Jake, I've read a couple of your posts describing your system and I cannot envision it. Do you have any pictures or a drawing or something, is sounds like a very complicated design, it's difficult to understand what you've been trying to explain.
 
filter box

filter box

Hi Floyd

Yeah, I do have a communication system, its really fairly simple. To me anyhow.

It uses 2 pumps, the return flow into the filter box from the tanks, looking from left to right the stock tank is in 3 sections(Acyrlic dividers), the section on the left I call the first and receives the water from the tanks, a pump in there picks up the water and moves it to the center section, which has a deep gravel bed, the frame for the AST sits on top of the gravel and the line from the pump goes to it, and the water flows out of the pvc over the mesh and down through the gravel bed.

At the bottom of the gravel is a screen to hold the gravel up, sitting on some pvc for clearance. The acrylic divider of the center and last section is raised up 2" off the bottom to allow water to flow under it into the far right section where the other pump returns it to the tanks.

The first divider on the left sets lower in the tank then the right hand divider in case the AST pump is off, its 3" lower then the 2nd divider so if the AST pump isnt operating the water can rise in the first chamber and overflow into the 2nd AST/Gravel section.

So the water flows by gravity into the filer box/sump, is picked up and pumped into the AST section and over the mesh, down through the gravel and into the other section to be pumped to the tanks, that section will also have a couple heaters and any other miscellaneous. Any water changes will happen in the first section coming from the tanks. Also from where water will be tested etc.

Liverock etc will be in the tanks, most of these in this first stage are for pairs, when done there will be ten tanks on this one, all for pairs, maybe an anemone in a couple.

I am almost finished with the stand for the first part, hopefully this weekend, picking up the pvc for the AST, getting the stock tank fitted under the stand, after the acrylis is installed, its a 100 gallon rubbermaid livestock tank, oblong, the two end sections will each be about 25% of the length with the center section the longest, it will have about 15" of aragonite gravel in it. Its very much like sump/refugia I have had in the past, just sectioned off , past ones have had a big gravel bed with the water flowing down through the gravel and being picked up at the bottom and returned to the tanks, on those I used the drain at the bottom to got to an external pump, this will used two submerged pumps. One in each end section.

I hope that is clearer, I was posting about the various parts before without thinking how it was coming across to others. At first I was thinking of a conventional sump in the first section with the AST there, but thought it was better to have it in this configuration. This way I can siphon grunge out of the first section, as well as off the surface of the gravel. Should be a lot of pods from both areas.
 
Ok, I think I understand it better now.

So are you trying to have some kind of special functionality to the system with the way you designed it?

Having the overflow dump into the first section, then pump it into the ATS tube? Why not just pipe the ATS directly to the overflow? Are you wanting to specifically control the flow rate to the screen by using a separate pump?

Also, what is the purpose of the 15" aragonite bed? Is this raised up so that the water must flow down through it to get to the third section?

If the frame for the ATS sits on top of the gravel bed, is this gravel bed submerged and by how much? How do you intend to light the screen?

I'm just curious at this point, trying to understand the purpose of each component...
 
I measured my Spray bars slot, and it was a little under 1/8" I carved it out more a little over 1/8 ", and tried to even out some spots. A couple spots got too wide. A lot of water flows over those spots, but, It's not spraying anywhere anymore. I sanded it down with a metal brush hopefully smoothing and evening it so stuff doesn't get stuck to the spray bar itself..

I have it wide open, I wouldn't here the ATS At all other than the gurgling noise from the drain. I scraped as much algae off as I could and sprayed the screen down with tap water. I have it running full blast now and no splaying and seems a lot better now.. We'll see if it can go a full week though without clogging up and spryaing all over...
 
I know. If I'm getting the full 300-400 gph. Then, That should be 3 times the turnover of my tank, which I believe is what we were waiming for if I remember right. :)
 
I haven't heard/seen a suggested tank turnover rate. Just a GPH/in rate that you want to shoot for, and that is 35 GPH/in of screen width.

If you have a narrow but very tall screen, you would get just as much contact time with the algae as you would with a wide and short screen. As long as sq in is correct, dimensional configuration really shouldn't matter that much, so it's really independent from tank turnover.

Anything else related to the turnover rate of your tank is all relative to the corals you keep and general good practice. If you keep only fish, then you just need as much circulation as is required to filter the water. If you keep corals, depending on the corals you may need a much higher turn rate, which is where you add up all your powerhead GPHs to figure out your flow.

Is that what you were talking about, or did I miss your point?
 
Hi Floyd

The frame of the ATS sits on the gravel bed, I have used DGBs for years to buffer PH and before for denitrification. But in this it will be for buffering. Otherwise the water flow and configuration is much as you have shown in the photos, the screen will be illuminated just as you have shown, the stock tank is 24" deep, and only 12-15" of gravel on the bottom, which receives the water after it has flown over the screen. The water comes off the screen and flows down through the gravel and under the divider into the 3rd chamber and then is returned to the tanks from there.

IF, for whatever reason the ATS pump is off, or should fail then the water will rise up in the 1rst chamber and down over the screen and through the gravel to the 3rd chamber. And then back up to the tanks.
 
Back
Top