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Thread: Cor-15 Flow

  1. #1
    Regular Vistor
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    Cor-15 Flow

    E5130016-E35A-4142-8CD7-9F2B3C1382D0.jpgI have a Cor-15 with a 1” FS plumbed very close to it. I have been trying to get my Cor to push more water through my system but at 100% my flow sensor says it’s pushing 390gph. From the pump to the sensor is maybe 1-1 1/2 feet away. Has anyone else experienced this issue or know a fix for it?

  2. #2
    Frequent Contributor zombie's Avatar
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    That might be all the COR is capable for that system. There have been a large number of posts about the red sea systems having very low flow rates because the small piping and fittings inside it add a significant amount of friction and "minor" losses. The best I have seen so far in a red sea tank is 700gph using a COR-20 without modifying the internal plumbing.

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  3. #3
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    Thank you, I was afraid that the plumbing would restrict it but not that much. I reset the pump and was able to achieve 400 gph. But being an SPS tank I would like around 5-600.

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    Quote Originally Posted by blasi View Post
    Thank you, I was afraid that the plumbing would restrict it but not that much. I reset the pump and was able to achieve 400 gph. But being an SPS tank I would like around 5-600.
    You are more than ok with 400GPH turn over spend the time and money on internal flow with extra power heads.


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  5. #5
    Frequent Contributor SuncrestReef's Avatar
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    Red Sea's return nozzles are the bottleneck at only 5/8" inside diameter, creating extra head pressure. I have a COR-20 on my Reefer XL 425 and can only get 400 gph max.

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    Quote Originally Posted by SuncrestReef View Post
    Red Sea's return nozzles are the bottleneck at only 5/8" inside diameter, creating extra head pressure. I have a COR-20 on my Reefer XL 425 and can only get 400 gph max.
    It's a combination of multiple things. The 5/8 nozzle on it's own only adds about a foot of extra head loss, but the 1/2" bulkhead and tiny elbows and whatnot finish the job. It appears from the info I have gotten off the forums that the head loss

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  7. #7
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    Just read this and posted similar question (should have read more first). COR 15 here that maxes out at 380 per apex FLO. Lots of other flow in tank from wav’s and a Gyre so I will just leave it based on other answers on here.


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