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Originally Posted by mikellini  I thought that it might not have been sitting properly, so I took it out and looked at it, cleaned it a little, and placed it back in a n umber of positions, ensuring the suction cups were adhering properly, and it still makes a rattling noise. I've heard of the same thing in a number of other posts on Reef Central an Nano-Reef.com... Also have heard of the pump failing on numerous occasions... |
I'm not there to hear it, so I take your word for it. That is why I like to shop at my
LFS. In this scenario, the owner would have simply pulled a pump from another unit and I would go home with it to see if it made a difference. If it did not, he would troubleshoot with me to see if the noise was indeed the fault of the pump or some other factor. He would even lend me a pump of another brand to see if it made a difference.
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Can you explain why the increased suction through the intakes would be a concern? I'm not sure I follow you...
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1) Feeding may require a pump shutdown because the food is pulled into the slots too quickly. Off course the pump can be turned off, but I do not like to turn magnetic pumps on and off, the wear and tear besides for the mystery of whether they will turn back on or not.
2) Small fish, crabs, and shrimps getting too close and being pulled in.
3) Snails and anenomes walking across being pinned down.......
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As for the excessive flow through the filter chambers, it's really only going up 1.6x the flow from the baseline... Will this make a huge difference? Maybe, depending on what I use for filtration. Remember, I have trimmed the slot that funnels the water to the back of the first chamber, and this allows for more even flow through the second chamber (and eliminates the option of using the trickle filtration with the bioballs)... Possible a little too much for a refugium, but definitely not too much for chemical filtration or a skimmer.
Thanks for your reply, you've got me thinking for sure!
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1) Say you have a tank that is 10 gallons in overall volume and the filter chamber is 1 quart of the overall total of 10 gallons.
2) Say it comes with a pump that is rated at 100 gallons a hour. That means in the overall volume, (100gph/10) you are getting 10X turnover. But because the 1 quart filter chamber is in line with the pump, (100gph/.25) it is getting a 25X turnover.
3) Say now you upgrade to a pump that is rated at 160gph, for a flowrate increase by 1.6X
Now your 10 gal overall gallons increase in flowrate from 100gph to 160gph have increased by a percentage 62.5%, but the flowrate through the 1 quart filter chamber has increased by 640%.
