CPR CS90 Overflow Box
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- For glass or acrylic aquariums up to 125 gal
- Flow rate 600 GPH
- 8" wid
- 1" bulkhead outflowUL>A built in overflow is the most efficient method of draining aquarium water to
- Adjustable water level allows you to easily change the level in your tank
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Feature(s): For glass or acrylic aquariums up to 125 gal. Flow rate 600 GPH. 8" wide 1" bulkhead outflowA 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.Tip: We recomond the use of an Aqua Lifter pump with the CPR overflows for trouble free operation. Another alternative is to hook the bleed hose from the overflow to the air intake of a power head. This way the overflow will continue to wok if it drawes some air into it or in the event of a power failure it will restart.Overview and Installation
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Update: working great so far but there is one issue that did come up. A fragment of tank debris, think it was plant material about 3 or 4 mm across was blocking the siphon air tap. I noticed bubbles were present and moving very slowly through the aqualift tubing. A simple fix was to break the siphon by removing the tubing for a few seconds from the siphon tap fitting. I now keep an eye on the aqualift pump tubing and may put some screening across the CS90 inlet. It hasn't happened again since. Would still use it.
Follow up The suction tube can get debris in it which can clog the lift pump causing the siphon to fail. It happened once and some water got on the floor. After that happened I decided to install an in line filter. The one recommended for the lift pump doesn't have good reviews so through the use of tubing adapters I use this. https://www.amazon.com/gp/product/B00K24I1Y6/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
I wish there were 2 suction ports on the overflow, an extra one in case the other gets clogged. For now I keep an eye on it and it's working well.
Otherwise I really like this overflow. It's very quiet and has a huge capacity for water, far more than my pump is capable of moving. It was easy to set up and looks much nicer in the tank than a usual U-pipe overflow. If it weren't for the misleading comment about the pump being optional, I would have given it 5 stars.
Adjusting it's height for where you want the water level is very easy with the 2 adjustment screws. There is a 3rd screw to adjust how it sits against the back. I keep one side slightly higher to direct any air to the hose nipple on the top.
I also purchased the lid separately for this. I think it should come with it for the price you pay instead of an extra 10 or so bucks. It does help cut down the noise slightly & keeps flying (and other) things out of the overflow.
I did not purchase the external pump to siphon out the air through the top to create / maintain suction. I am using a extra small power head I have & some vacuum hose. The hose if connected to the air-intake of the power head. This provides enough suction & I have it plugged in with my pumps in my wet/dry sump to keep things flowing. (it sits in the sump also)
What I don't like is cleaning this if you get any algae growth. It the algae is inside the U formed by the black plastic, it is very difficult to clean as you can't really get in there. Also the small tube connector on the top for sucking out the air can get clogged with aquarium slime or other debris.
I did have to add a intake cover to prevent smaller fishes from going through overflow after a small white cloud fish got sucked into the overflow & I had to net it out. Made this out of some plastic craft sheet that is used for cross stitch that has lots of square holes.
Outside of that, it works like any other hang on overflow.