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CPR CS90 Aquarium Overflow Box

Product code: 27

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CPR CS90 Aquarium Overflow Box

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 without expensive modifications to the tank. 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. 
  • Quiet operation. 
  • CS Overflows feature a grated inlet.



  • Model: CS90
  • Flow Rate: 600gph
  • Outflow Size: 1" Bulkhead



  • (1) Overflow body
  • (1) Screen and sponge
  • (1) Vent tube with small “O” ring
  • (1) Bulkhead assembly
  • (3) Adjustment screws
  • (1) Air line
  • (1) Aqua Lifter pump and Acrylic Lid (included in Deluxe models)


Questions on CPR CS90 Aquarium Overflow Box

  • From joe harper at 5/17/2020 5:03 PM
    • which cpr hang on back over flow box would be best for a 75 gallon discus planted tank. ill be using the trigger 34 emerald sump along with the reef octopus varios 2dc water pump. I have never used a sump before, people are telling me to go with the cpr brand. thank you joe h
    • Joe,
      CS90 would be a good fit for 75 gal. system.
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149.95 In stock