On my 75 I use two of the Marineland SOS overflow skimmers. On my 37 I use a pretty generic acrylic overflow that came paired with my wet dry filter about 15 years ago.
I chose to use two of the SOS skimmers because they were relatively cheap. I got one for $60 and the other for $40. Marineland no longer makes them as far as I know. I used two because I was fearful that with the size of return pumps I had, I would over drive one, making it noisy. The sump I have also has a place for two filter socks and I wanted to maximize the flow through each sock rather than splitting it. The good in these is that they can be tuned to be pretty quiet and each one has a back up drain in case the primary drain becomes clogged by debris or a snail or somehting of that nature. The down side is that the siphon is a little harder to start since the siphon tube is pretty flat. I can be difficult to get a piece of air line where you need it to start the siphon. I also don't think the two of mine are made exactly the same, since the one on the righ of my tank handles much more flow than the one on the left. The one on the left tends to lose siphon much more readily than the one on the right. At some point I'd like to replace the flex hose with
PVC piping to see if that helps. I have had one close call where I thought I had lost siphon on both, but in reality only lost siphon on one and had it come close on the other (to the point that water was flowing, but not at a high rate of speed.) Once I lifted the siphon tube to restart the siphon, I actually broke it completely and had an overflow. That was once in an 8 month period. Before I installed an auto top off system, I lost siphon pretty regularly due to bubbles going into the tank. There was never an overflow from this because the water level was already low in the sump.
The generic overflow I have only had an issue with if there is a lot of evaporation which is not kept up on or the prefilter sponge in the overflow gets really clogged. In the case of evaporation, it's pretty easy to restart the siphon. If you miss a clogged prefilter and try to make up for it with top off water, you can overfill the tank as water won't flow through the drain as quickly.
i can say I've heard mostly good things about the CPR overflows.
It is a violation of federal law to use this product in a manner inconsistent with its labelling.
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