Protein Skimmer Capacity Calculations

TheFishTeen

New member
Every protein skimmer available comes with a volume rating, so you can pick the right model for your system size.

But every tank has a different bio-load, and different filtration. Every one's aquarium water chemistry is different. So how does a company rate their skimmers' volume capacity? They can't just test their own systems and see if the water is clean.

Some companies go as far as putting separate specific numbers, such as "300G for a light bio-load, 250-200G for medium to heavy". How do they calculate this?

I once read that a public aquarium used algal turf scrubbers as a main means of filtration, and on a consistent basis would place a mat of algae from the scrubber in a dehumidifier, then they would weigh and analyze the mat to measure the export of nutrients.

Can protein skimmer manufacturers use a precise method to measure the nutrient export as a result of the unit, or do they just guess, taking to mind "X"GPH VS "X"l/ph of air intake to assume "X" as the contact time, then taking that time and figuring in the units capacity to handle a system? I may be way off, but I've been trying to do research on this and nothing has come up.

It seems unless there is a scientific method of calculating a maximum skimmer volume capacity, there is no way to know if a skimmer model can work for your tank, if its rated lower and vise-versa.
 
The website appears to be down, I was trying to check an article earlier and couldn't. Feldman has about a dozen articles looking at skimmers and GAC and I would recommend reading all of them
 
body size, height, pump ( lph ), come into play, most modern short skimmers neglect dwell time and use a bubble plate, and the ones that look like wine bottles with the pump in them are the worst design for dwell time. The rating system is non standardized probably the best analogy i can think of is go shop for a car stereo.... 50 watts, 5000 watts,, same 3.2 capacitors on both amps. lol
 
There are so many variables involved in 'sizing' a skimmer that attempting to put a 'rating' on any individual unit is pointless IMO. All the manufacturer ratings should be used for is as a starting point. Tank volume has always been, at best, a proxy for skimmer size, and as the OP notes, bio-load will be different across tanks of similar volume. Size of the skimmer will also be driven by maintenance habits - more frequent cleaning will result in a more efficient unit.
 
All you can do is use the manufacturer's numbers as a guide and get opinions from others running the skimmers you are interested in, on tanks close in size to yours. Then make an edumacated guess. A little trial and error may be involved.

Basically you want a skimmer that has the occasional lull in skimmate production. This means it is keeping up, but it's not TOO big.

If you want the easy way out… just call and talk to Jeff at LifeReef. He'll tell you which one of his skimmers to buy. It's the easy, inexpensive and efficient way to go. Ignore all the other hype out there. You can thank me later. ;)
 
You can look at reef dynamics sight and poss. e/mail or talk to him
I recently purchased one of his skimmers
Also one of his bio pellet reactors
 
Big E......Thanks for the link.....I was not aware of that book,..although I do have Moe's book or had,....before I lost that somehow?...

Greg 45.....I just picked up a Reef Dynamics from another club member...for free actually....though it needs a pump.....cant wit to fire it up...


D2mini.....I had a lifereef once...and thought it was the best skimmer I owned ever...no kidding...
 
I just look at pump wattage. (not counting DC pumps)

I don't even believe any of the air/water draw numbers anyone puts out except in comparison within their own line. None of it is verified and some of it just seems like make believe. I then look at reaction chamber size vs recommended running depth. Gimmicks like Cone-S raises my eyebrow but it seems like marketing fluff. Nobody's proven it does anything.

Perhaps most importantly, I look at supporting accessories available. That way I know there are neck cleaners/extenders/skimmate outlets and other things that are made just the right fit for it instead of poorly slapping together some ghetto DIY solution.
 
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