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I use a CPR 102. Aqualifter is recommended or a powerhead attached to bleeder hose for better peace of mind from flooding.
When I did run a siphon overflow, I did a lot of research because I was afraid of flooding. The CPR CS90 (which was suitable for a 46 bow) was the best option, with the aqualifter of course. I would still only reccomend this option if it is impossible to drill the tank, like if it is full of water.

Remember to siphon break the return pump. In my drilled 150 I used to just have the flat outlet (Lok-Link) right at the surface so it wouldn't pull too much water before it started sucking enough air to stop the siphon. In the 46 Bow with the CS90 I just drilled a hole at the top of the return line at the water's surface.
 

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I think I got lost here somewhere. A hole or 2 should be drilled into the return line right at the water surface to break the siphon, or the DT would empty through that line. I have 2 in mine. The Aqualifter is used at the Overflow Box, to ensure that all air is removed from the Weir to start the siphon again safely. Did i get messed up?
 

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I think I got lost here somewhere. A hole or 2 should be drilled into the return line right at the water surface to break the siphon, or the DT would empty through that line. I have 2 in mine. The Aqualifter is used at the Overflow Box, to ensure that all air is removed from the Weir to start the siphon again safely. Did i get messed up?
No, we are on the same page. I was just reminding him to break the siphon in the return pump in case of power outage. I didn't mean to insinuate that the aqualifter should be used at the return line, but I did want to stress that drilling the actual tank is better than an overflow box. Even with the aqualifter I would still get nervous when I was at work for ten hours and a rough thunderstorm would pass through. If I lost power and that aqualifter burnt out, I would pump the entire sump into the DT!

When I ran the 46, the sump was an afterthought. If I have a tank with water in it that I want to add a sump to, then an overflow box is the way to go. I usually try to plan for the future and add what I want at the beginning of the build, so I would drill the back of the tank to have an overflow if it were not "reef-ready". Members here have used Glass-Holes and liked them. I might just do a coast-to-coast because of the low cost of it if I ever decide on the sump route again...
 

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Discussion Starter #26
I ended up getting the cs90 with the aqua-lifter pump for my tank. When i started the tank i had no idea a sump even existed so there was absolutely no planning for it what so ever. hind sight is 20/20 though and i now have the tank all set up and established with fish and it would be a massive ridiculous project. if i ever start a new tank i will most definitely be drilling the tank though. i am recycling a 25 gallon tank i bought at a yard sale, installing glass dividers for a bubble trap after my in sump protein skimmer and to create a refugium and pump chamber. still gathering all the materials for it but i'm hoping that i will be able to have it up and running in the next week or so.
 
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