The OF 600 Overflow Box has a flow rate of 600 gallons per hour and is rated for aquariums up to 125 gallons in size. This is a great continuous overflow box to consider, one that works without the U-tubes. This is a fairly space-efficient model to go with, yet another bonus. This particular HOB overflow box also comes with dual drains, which, once again, is great in case one gets clogged. The drains both come with foam filter pads equipped to help clean the water of solid debris and to prevent clogging as well. This box is easy to install, as most hang-on-back overflow boxes tend to be. The CPR CS90 Box does have a flow rate of about 600 gallons per hour, which is fairly impressive. The black top of the CPR CS90 is also designed to help reduce algae blooms and buildups. The bulkhead included is perhaps the best way to drain water from an aquarium to a sump or a filtration unit. It’s an easy way to adjust the water level in the tank as well. What is pretty cool about the CPR CS90 Overflow Box is that it features an adjustable water level, so you can control how much water is being siphoned from the aquarium to the sump. If you have a decent home aquarium, this should be more than ideal for you. This is another nice overflow box to consider, and it is one that is rated for aquariums up to 100 gallons. Yes, it is quite durable, effective, and it gets the job done, but it is not stylish, nor is it quiet. One thing that needs to be said here is that this particular overflow box is definitely not very good looking. However, there is an option of this model that can be used for aquariums up to 400 gallons. This thing can be used for any aquarium up to 125 gallons in size. The foam pad included here is pretty useful as well, as it filters out solid debris, thus cleaning the water and helping to prevent clogging. In case one drain clogs, the other one will pick up the slack. You don’t want your box overflowing, as this will cause problems. The Aqueon HOB Overflow Box features dual drains, which are always useful. All you have to do is connect the tubing or hoses to your sump, hang the Aqueon Hang-On Overflow Box on the aquarium, and you are good to go. The fact that it is so easy to set up is definitely an advantage. No, the materials used are not of the highest quality out there, but they should last for a good while, assuming it’s properly looked after. This is another really simple and effective hang-on-back overflow box. One complaint is that it is a bit loud, but it does get the job done. At the same time, it is actually pretty lightweight and not all that bulky, which helps with setup and spatial requirements. Only the highest quality materials were used here. This overflow box is very durable and well-built. In other words, it cleans the water and makes sure that the drain pipe does not get clogged. This more or less acts as a flow regulator, plus it helps filter solid debris out of the water as well. More or less, just hang it over the back of your aquarium, put the siphon in the tank, and connect the drain tube to the sump.įurthermore, the Pf-800 comes with cylinder foam pads over the drainpipe, which is pretty convenient as well. It’s a very simple to install hang on back overflow box. It helps to stop the Pf-800 Overflow Box itself from overflowing. In case one gets clogged, there is another one as a backup. Something that comes in quite handy here is that it has dual drains that lead down to the sump or back into the aquarium if you choose. What is really neat about this thing is that you can use it for small aquariums such as 30-gallon tanks, or for anything up to 400 gallons as well. Easy installation for glass or acrylic aquariums.The Eshopps Pf-800 can be used for any aquarium up to 400 gallons in size. Every overflow features silent operation and will not break siphon during power outages. These overflow boxes are designed to enhance filtration by siphoning water from an aquarium to an external sump, refugium, or wet/dry. Our state of art overflow systems are made with quality cell-cast acrylic.
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