Blue Ocean of 600 Overflow Box Continuous Siphon 125G Aquarium

Easy to install, works perfectly, no unwanted noise. Makes sure to get a powerhead to guarantee it flows again after a power outage. The vacuum can not be connected to a protein skimmer, the skimmer won't operate correctly.

I already have a CPR CS-90. It came broken , but, I'm sure I could have had it replaced but I was in need of it that day so I repaired it myself. It works great.I need to get 4 more overflows, so, I just purchased one of these Chinese replicas to see it.I am really surprised it is almost an exact copy. The quality is the same. If you want to save yourself some money go this route. I am buying 3 more as soon as they are back in stock. Any one who says this is of poor quality probably works for CPR.

I initially had a PVC diy solution for overflow that was just not pretty or reliable, so I had been looking at this type of overflow for a while. They're usually a bit more expensive than from this seller, so I went with this one. I'm not sure if this seller gets ones that didn't pass QC or what, but the one I got didn't hold water initially. That is, it held water, but not a siphon, because the lower chamber's clear divider wasn't glued down on over half the bottom. It was a simple enough fix to get some acryllic weld-on (the thicker kind) and fill the gap, though.Once fixed, the thing works great. I turn off my pump every two days during feeding, and almost never lose the siphon when I do. I'm not sure what exactly triggers it, but maybe every couple weeks I have to pull a tiny bit of air out of the siphon. I put an air check valve on the end of the tubing and just suck the air out, and it works fine to keep the siphon primed.The only caveat other than build quality is probably capacity. I got this because it had a higher flow rate than my pump, so there's no chance of overflow. The only problem with that is that the flow is low enough that a lot of waste gets trapped in the lower chamber of the siphon, because the water pressure doesn't force it up over the lip into the drain compartment. It's not a big deal, though, as it's easy to get the stuff cleaned out by agitating it.

Works great, the slots on the front of the overflow box that's inside the tank, Are an added bonus in comparison to the CPR overflow I've been using for years . The design of the inside overflow is great. If you adjust the height correctly. If for some reason the slots ever got blocked the Overflow can still receive water from going over the top of the overflow box, avoiding a tank overflow. If you haven't gotten it yet I recommend it. Half the price of the competitors and works as good if not better. Very well designed. I normally don't leave reviews like this. But I've been a fish keeping since 2002 and very rarely there's something impress me. The does though

Works ok, no instructions provided. The real problem is that it slowly loses siphon over a few days. Would not buy again.

Have this for a few weeks. Works fine initially. But, as time goes on, I can see the air increases in the chamber day by day till it loose siphon. This morning, my tank almost flood due to this. I don't use a vacuum pump thinking I can get away with it. Turns out, a vacuum pump is must have for this kind of HOB overflow box.

I have this box on my 60g reef with a 55g sump with a return pump running at 400gph at its head height. This box easily keeps up with the flow and could take more no problem. It did gurgle a bit when I first got it but I added a diy pvc silencer that cost around $10 to make. Even with the added cost you still save a good bit of money. I wouldn’t hesitate to buy this again if I set up another tank.

My goodness, I've done a diy over flow for about a year now and I had my doubts about this thing handling the amount of water I push through my 55 gallon tanks. I have 3 that I push 1100gph into from a single sump and these handle it beautifully. I'm gonna have to buy another for the third tank I love these.