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Old 03-24-2015, 01:23 AM   #11
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Interesting, but far from conclusive science.
There are a couple of key factors not mentioned that greatly influence the composition of the skimmate being produced;
1) is the water being pulled directly from the tank or from a sump after going through a sock or other means of mechanical filtration?
2) what is the bubble/water contact time?


if pulling directly from the tank you will get much, much more organic matter in the skimmate than if pulling from the sump post filter sock.


contact time is probably the most crucial factor with overall bubble surface area being second.
Some compounds can take almost 2 minutes to be pulled out of solution. The longer the bubbles stay in the water/reaction chamber, the more compounds that can be removed.
Recirculating protein skimmers of the type used in the experiment do not achieve those contact times and attempt to make up for it by recirculating the water through the skimmer, but it's not the same as a prolonged contact time for each bubble.


I would love to see more thorough research utilizing different skimmer types and see what different results may be had between a recirculating skimmer and a tall counter-current type
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Old 03-24-2015, 01:34 AM   #12
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Originally Posted by nelix10 View Post
Just wondering why you are interested in mass spec analysis on your water? At work we get water isotope analysis done for about $150, this is in Canada! Water analysis can have a very wide range of price based on what you want to look at!


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As I can only test for a half dozen simple chemicals, I would find it useful to compare my tank water to a average seawater sample from a reef. I know it will vary, but I would still be interested in if there were key elements raised or lower than normal.


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Old 03-24-2015, 01:38 AM   #13
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Originally Posted by PB_Smith View Post
Interesting, but far from conclusive science.
There are a couple of key factors not mentioned that greatly influence the composition of the skimmate being produced;
1) is the water being pulled directly from the tank or from a sump after going through a sock or other means of mechanical filtration?
2) what is the bubble/water contact time?


if pulling directly from the tank you will get much, much more organic matter in the skimmate than if pulling from the sump post filter sock.


contact time is probably the most crucial factor with overall bubble surface area being second.
Some compounds can take almost 2 minutes to be pulled out of solution. The longer the bubbles stay in the water/reaction chamber, the more compounds that can be removed.
Recirculating protein skimmers of the type used in the experiment do not achieve those contact times and attempt to make up for it by recirculating the water through the skimmer, but it's not the same as a prolonged contact time for each bubble.


I would love to see more thorough research utilizing different skimmer types and see what different results may be had between a recirculating skimmer and a tall counter-current type

I agree. A independent test should be done with as many skimmers as available. Setting up a test bed would be fairly simple. Instead of using the output of a actual fish tank, you could selectively add elements to a test tank and see the efficiency of lifting those materials out of a defined volume of water.



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