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Old 07-25-2013, 09:33 PM   #61
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Originally Posted by navaljonf View Post
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.
It says IF you plan for PARALLEL pumps. It is not suggested for return pumps.
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Old 07-25-2013, 10:08 PM   #62
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The scenario is the actual system that OliverB is experiencing with his 2 skimmers.
Maybe he only has X amount of DOC's to remove. What makes you think both skimmers will fill to the same level at the same speed if the water is clean?
bottom line, he's got enough skimmer(s) on that tank for his feeding and bio load at this point. Maybe he didn't before. Nothing is taking away from the other, he's just doubled his mechanical filtration.
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Old 07-25-2013, 10:11 PM   #63
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Mine never ran equally. One day one would catch the most skim, next day it was reversed. I think it had to do with the fact I have two connected sumps that had a skimmer each. The DOCs in each sump may have varied.
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Old 07-25-2013, 10:16 PM   #64
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If you read the post of OliverB, the 2nd skimmer is removing lots of stuff while the 1st one just barely. Regardless wither the 2nd one is bigger or not, it does affect the other. Again we are not talking about the HOB skimmers mounted at the opposite end of DT. Even then, with dissimilar capacity you will obviously notice one to be with more skim while leaving the other with lesser skim. Does it not tell you that you are running a skimmer that is not at its full capacity?
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Old 07-25-2013, 10:17 PM   #65
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I have been reading this thread and you guys are making me laugh. lol

You keep going back and forth about it but to me it just seems both have merits. If you have two smaller skimmers and they fit in the sump hey, why not just use them? Beats getting a huge single skimmer. lol

Both scenarios will work, and work well so why the back and forth?
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Old 07-25-2013, 10:27 PM   #66
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Because this is the "Junior Fish Debate Squad." I say "Up" and you say "Down." It's a blast.
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Old 07-25-2013, 10:31 PM   #67
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So, anyone wish to comment on a skimmer with 3 pumps? Not as good as a skimmer with 1? Is this not the same thing?
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Old 07-25-2013, 10:34 PM   #68
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If you mean two of them are recirculating needle pumps, it greatly increases the number of bubbles and dwell time. So yes, much more efficient than a single pump.
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Old 07-25-2013, 10:35 PM   #69
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So, anyone wish to comment on a skimmer with 3 pumps? Not as good as a skimmer with 1? Is this not the same thing?
Ill give it a shot. I think adding three pumps would make an awesome fountain!!! Whomever tries, please post a pic... Lol
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Old 07-25-2013, 10:51 PM   #70
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I would say 4 is better than 3 but then why waste energy if 1 can do the job?
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