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Old 07-25-2013, 07:47 PM   #51
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That's not true. Two 200 gallon skimmers will be a 400 gallon skimmer. Possibly even better than a 400 gallon skimmer because the reaction chamber will probably be larger.
The only downside was the maintenance and slightly more electric.
+1 that's how I see it. Bio load is relative to the equation. Bubbles As many as you can generate in a reaction system that gives them maximum exposure for the water flow rate. I am sure there is a calculator for that in the water treatment industry.
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Old 07-25-2013, 07:52 PM   #52
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I just don't understand what you're saying. Sorry.
Both skimmers work independently of each other and each will remove skim based on its efficiency. If I run my big skimmer and get let's say, a pint of skim per day. Then add a second one, I won't see 2 pints a day, but I will get more skim than the single one produced because I am processing more water over a fixed amount of time.
Please read the post of OliverB at bottom of page 3. The 1st skimmer works fine by itself but when another skimmer was added its performance dropped down significantly. That means the pump is no longer efficient than before. We are talking about skimmers next to each other at the sump.
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Old 07-25-2013, 08:39 PM   #53
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No...that means that both skimmers are splitting the load now.
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Old 07-25-2013, 08:50 PM   #54
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I think everyone is missing the point of EFFICIENCY. I am not arguing about how many skimmers that works best. Of course common sense will tell you that the 2 skimmers would collectively will have more skim than just one of them, duh. The question is are they both efficient that you don't waste energy? If one of them is collecting just 50% than when by itself then it is obviously 50% efficient. Each pump still runs and consumes the same power as when running individually. Meaning you are consuming and paying the wasted energy. It doesn't matter if the cost is very cheap but the issue is EFFICIENCY.
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Old 07-25-2013, 08:54 PM   #55
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Just for those who are thinking of having pumps installed in parallel, this article may give you some pointers to do it the right way. Just take note that the last paragraph it says

"In summary, parallel pump systems are more expensive, less efficient, and create problems with load sharing that single pumps do not."

Parallel Pumping Considerations
This article is completely out of context. The efficiency of the pump is impacted by the inlet pressure (net pos suction head available) which in a closed system can be impacted by parallel pumps. However fish tanks are open systems where the inlet pressure to each pump is affected by the actual pump and the height of water it is in. Assuming the water level stays the same there is no negative impact to adding another.
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Old 07-25-2013, 09:02 PM   #56
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Okay, I'll chime in to try and simplify as much as possible. If you have one pump with 100 GPH water flow creating 1000 bubbles per hour as well, one protein skimmer will, in turn, receive 100 GPH and 1000 bubbles. If another protein skimmer is added, and the flow (of both water and bubbles) is equally split, each will now receive 50 GPH and 500 bubbles. This is as simple as it gets from my point of view. (Of course talking about skimmers that receive bubbles from the pump) If the skimmers create their own bubbles with an air pump, then only the water flow is divided which will still diminish the amount of water in contact with bubbles. Skimmers are built with a certain flow to bubble ratio for maximum efficiency. If you can reach that efficiency level with one pump great, but you will not be using the "stock" pump packaged with the skimmer. Hope this helps!! And ends the debate... Lol.
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Old 07-25-2013, 09:04 PM   #57
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A larger skimmer will have a larger pump. How do you know they will be 50% as efficient?
All skimmers being different and using different pumps and pulling different amounts of air would make your statement false. Basically then, all you would have to do is find 2 smaller skimmers that pull more air collectively than your larger skimmer, and use less wattage.

Who's splitting the amount of water that is fed to the skimmers? Who's limiting it?
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Old 07-25-2013, 09:04 PM   #58
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I never referred to the skimmers using the same pump or inlet. On a open system like a sump, two independent skimmers of the same size and design doubles the amount of foam and doubles the reaction chamber size.
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Old 07-25-2013, 09:11 PM   #59
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Okay, since there are two skimmers independent of each other, at some point, you will run out of skimmate. You could add a thousand skimmers, and if they are all pulling out nasty skimmate, them keep on going adding more. It's simply how much money and space you have until you reach a point that you have an adequate skimming efficiency for your tank. Any more than that, and you're wasting your time and money.
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Old 07-25-2013, 09:11 PM   #60
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A larger skimmer will have a larger pump. How do you know they will be 50% as efficient?
All skimmers being different and using different pumps and pulling different amounts of air would make your statement false. Basically then, all you would have to do is find 2 smaller skimmers that pull more air collectively than your larger skimmer, and use less wattage.

Who's splitting the amount of water that is fed to the skimmers? Who's limiting it?
The scenario is the actual system that OliverB is experiencing with his 2 skimmers.
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