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Deluxe CPR Continuous Siphon Overflows

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Quick Overview

A built-in overflow is the most efficient method of draining aquarium water to a filter. If your aquarium does not have built-in overflow, CPR Continuous Siphon Overflows/Prefilters are the best means for getting water from an aquarium to a filter system. They quietly skim up to six times more water than units with tubes.


The advantages of CPR Continuous Siphon Overflows/Prefilters include:


  • Adjustable water level allows you to easily change the level in your tank

  • Black top reduces algae growth

  • Plastic screen to prevent fish loss

  • Quiet operation: All units except the CS150 come with slip screen, sponge and vent tube to help reduce noise.

All Units come with the Aqualifter Pump and acrylic lid for quieter operation.


How to Choose an Overflow -CLICK HERE

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  • Quick Overview

A built-in overflow is the most efficient method of draining aquarium water to a filter. If your aquarium does not have built-in overflow, CPR Continuous Siphon Overflows/Prefilters are the best means for getting water from an aquarium to a filter system. They quietly skim up to six times more water than units with tubes.

The advantages of CPR Continuous Siphon Overflows/Prefilters include:

  • Adjustable water level allows you to easily change the level in your tank
  • Black top reduces algae growth
  • Plastic screen to prevent fish loss
  • Quiet operation: All units except the CS150 come with slip screen, sponge and vent tube to help reduce noise.

All Units come with the Aqualifter Pump and acrylic lid for quieter operation.

How to Choose an Overflow -CLICK HERE More

Deluxe CPR Continuous Siphon Overflows

93% Recommend this to a friend (25 of 27)

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Deluxe CS50 with Lid and Aqua Lifter
SKU: 206560
Earn 109 Reward Points
$109.99
 
 
Deluxe CS90 with Lid and Aqua Lifter
SKU: 206561
Earn 129 Reward Points
$129.99
 
 
Deluxe CS100 with Lid and Aqua Lifter
SKU: 206562
Earn 139 Reward Points
$139.99
 
 
Deluxe CS102 with Lid and Aqua Lifter
SKU: 206563
Earn 150 Reward Points
$150.99
 
 
Deluxe CS150 with Lid and Aqua Lifter
SKU: 206564
Earn 154 Reward Points
$154.99
 

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Previously Asked Questions

  • by Debbie on April 30, 2014, @5:46 AM

    In the event of a power failure when I'm not home, will the unit begin the siphon automatically when the power comes back on? Will there be any chance of overflowing my tank or system?

    Bulk Reef Supply Hi Debbie,
    The overflow is designed as such that the siphon is maintained in the event of a power outage. It won't "recreate" a siphon but it shouldn't lose a siphon to begin with.

    Do you find this question helpful?  Yes   No

  • by Shane on March 10, 2014, @8:10 AM

    Perhaps a silly question but, now that I have my sump with CPR overflow up and running, how do I keep my floating fish food pellets(Spectrum) from being sucked into th overflow?
    Thanks, Shane

    Bulk Reef Supply Hi Shane,
    Its a good question and one that everyone with a sump faces. The most common solution is to turn off the return pump while you feed. Almost every controller on the market has a standby or feed option which allows you to turn them off on a temporary timer so if you have a controller that is the best route to go. Otherwise just pull the plug (just don't forget to plug it back in!).

    Do you find this question helpful?  Yes   No

  • by andrew on December 16, 2013, @9:51 AM

    What size (or type) return pump would you recommend with this overflow? It would basically need to have about a 5' head height to reach from sump to tank. Thank you!

    Bulk Reef Supply Hey Andrew,
    It depends on which of the overflows you are looking at. As a rule of thumb though you want your return pump to be in the ballpark of 10x the size of your tank. So around 500gph for a 50g tank for example. Then make sure that your overflow is rated for a flow higher then whatever that number is. You don't want a 300gph overflow with a 500gph pump as that extra 200gph has to go somewhere (and it will be on your floor!).

    Do you find this question helpful?  Yes   No

  • by john on April 20, 2014, @7:30 AM

    how big should this box be for 125 gal tank

    Bulk Reef Supply Hi John,
    The overlow box just has to be large enough to accomidate the flow from your return pump. Without knowing how big your pump is I can't say for sure, but assuming its in the ballpark of 1200gph like most return pumps on a tank that size would be, the CS102 should do the job.

    Do you find this question helpful?  Yes   No

  • by Brian on July 21, 2014, @12:38 PM

    Does the Aqua-lifter pump run continuously or does it have some a sensor to know when air is in the system?

    Bulk Reef Supply Hi Brian,
    The aqualifter runs continuously. Really there is no reason not too. There isn't a downside to running it and the last thing you want is for it to not run because of a malfunction from an extra sensor :)

    Do you find this question helpful?  Yes   No

  • by Owen on December 2, 2013, @12:23 PM

    Can I somehow restrict the flow on the CS50 to 250gph?

    Bulk Reef Supply Hi Owen,
    You wouldn't want to restrict the flow on the overflow itself otherwise you run the risk of an overflow if something impedes it further (snail, algae, etc) but you can restrict the output of your return pump to 250gph. If 250gph is all that is pumping up the tank, then 250gph is all that will drain via the overflow. Its basically self replicating (up to the max size of the overflow) because it only drains the water that "overflows" into the overflow system.

    Do you find this question helpful?  Yes   No

Full Details

DELUXE PACKAGE Includes:

  • CS Siphon Overflow box
  • Acrylic Lid
  • Aqua-Lifter Pump

CS50 Specifications:

  • Flow Rate: 300gph
  • Outflow Size: 3/4" Bulkhead
  • Width: 6"
  • Requires approximately 6" of clearance on outside of tank

CS90 Specifications:

  • Flow Rate: 600gph
  • Outflow Size: 1" Bulkhead
  • Width: 7.25"

CS100 Specifications:

  • Flow Rate: 800gph
  • Outflow Size: 1" Bulkhead
  • Width: 9 3/8"

CS102 Specifications:

  • Flow Rate: 1,200gph
  • Outflow Size: 2 x 1" Bulkheads
  • Width: 9 3/8"

CS150 Specifications:

  • Flow Rate: 1,600gph
  • Outflow Size: 1.5" Bulkhead
  • Width: 9 3/8"

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Reviews

Items 1 to 12 of 27 total

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  • no Better service, no better product. Thanks BRS!!! By Trinnium on 2/26/2015

    If you need an over flow box, this is the one to get. If you’re not sure where or whom to perches it from, then someone has failed to direct you to BRS!!!. Amazing product!! Amazing service!!, that sums it all up. O yea!! I am real person like you, not someone that works for them or computer generated:). Just saying :).
  • Does its job By Sean on 2/16/2015

    It works like it is supposed to and its the only option I have now. But it is a little big and requires a lot of room behind the aquarium.
  • good product By Ken on 1/26/2015

    If you are not able to get a pre-drilled tank these are great products. You can regulate the flow from the return pump and make it virtually silent. It can be difficult to clean but I have only had to do that on a few occasions. This is my second CPR overflow, the first was 10 years old and I had no problems with it, I damaged it moving my 75 to another room so this is a replacement. The aqualifter, I can take it or leave it. I was using a MaxiJet 1200 with the same results plus the added benefit of additional current.
  • lifter pump runtime By Greg on 12/22/2014

    If you are worried about the lifter pump failing after it has run so long it dies (I read this concern), what you can do is put a refractometer in line with the tubing. You could probably use a Smart ATO, and if it senses a refraction due to salt water it will be off, If the refractive index is that of air, it will turn on. Much like it behaves in a sump turning on an auto fill cycle. Seems like a lot of trouble though. The lifter pump is a safe guard against air pocket build up in your overflow and is not necessary for the overflow to run. It is a safe guard and certainly recommended. Much better than U-tubes.
  • CS90; The perfect HOB overflow By Greg on 12/21/2014

    Installed a CS90 w/lifter pump. Plugged it in. Done. Perfect. I too got a little gurgling at first however, then increased my flow to hold at about an inch above the head of the filter guard on the intake. Silent.
  • Excellent By Roger on 11/20/2014

    I've had this overflow for almost a year now. It works flawlessly. Easy to assemble and use.
  • Great Product By Bill on 9/7/2014

    I have been useing this over flow for about 8 years. I just replaced it because the nipple for the vaccume pump broke off. I have never had a siphon break in all those years. When the power goes off, it starts up quickly and resumes the flow. If you do not have a drilled tank, get this product
  • quality product By Eric on 7/26/2014

    Purchased this because I cannot drill holes in my tank. I was nervous when buying this because of it possibly failing, but it has been running constantly with no issues. When power goes out it drains into sump and when power comes back on the siphon restarts and works just like it should.
  • Good By Victor on 3/11/2014

    I have the CPR102 on my 75 gallon with 40gal sump. I like how quiet it is, it does need a little tweaking to get it quiet My Skimmer is louder than this
  • Does the job By Reefer368 on 3/4/2014

    I have the cs 150 for my 125 gallon tank and 40 gallon sump it is awesome except for the fact that my system is hard plumbed and it is pretty loud with the gurgling of the water
  • Works great very happy with it! By Jorge on 2/24/2014

    We are very happy with our choice and would say no problems at all with it.
  • CS90 Great product By O'D on 2/5/2014

    I originally went the cheapest/ugliest route and constructed overflows out of PVC via DIY videos on YouTube. While they were indeed cheap, functional, and gave a sense of accomplishment, it just didn't look good, and brought a constant fear factor knowing the flaws of that system. I was toying with the idea of drilling the tank, but soon decided a HOB overflow would be the safest route. These overflows are great, but I would like to know how long the pump will last until it burns out...while the siphon remains despite the pump being turned off (or if it died), if the power goes out and then comes back on and you're not there to start the siphon again, you could easily flood the tank and cause big problems. I would definitely say the pros out weigh what little cons there are with this. I'm not having any noise problems, but if you do, there are videos for standpipes to help with this.

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