Eshopps PF-800 Overflow Box - Up to 125 gal.

I have this overflow except it only has 1 U tube. I think my U tube is bigger. The overflow works fine. It's designed to maintain prime throughout the duration of a power outage. Mine had an internal leak that cause it to loose prime after about half an hour of no power. I fixed it with some PVC cement. I recommend you test yours for this leak before you leave the house with it running. Just get it going and then shut off your pumps. Then wait hours and watch the water level in the center chamber. It should stay at the top.

If you dump water into the center chamber quickly, air bubbles can go up the U tube and cause it to lose prime. When filling my tank with new water, I put the hose from the trash can into the hole in one of the sponge filters and that stops the bubbles from getting in there. You just always have to be mindful of prime when you are messing with it. If you cause it to lose prime, you sump will empty itself on the floor via your main tank. I guess that's why the U tube is clear. Being clear means you have to put a brush in it sometimes to clean out algae but at least you can see, at a glace, if you lost prime while you were adding water or moving it or whatever you are doing to it.

Easy install, put on tank adjust black box up or down to control water level in tank. Start siphon ( I have found it is easy to put a piece of airline tubing up the pipe and start a siphon and then pull out). Was a little loud, I removed the black sponge and put a piece of airline tubing down the hole and it did the trick (thanks to a youtube video) I have it on a 75 gallon tank with a RIO Plus 2500 rated at 782gph pump. Works great!!!!

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This is overall pretty good. I never loose siphon, and with a diy "gurgle buster" this thing is pretty silent. However, this thing cannot be putting out nearly 800 GPH. I have an almost straight down PVC run into the sump with 2 elbows. So there is no restrictions on the outflow. I have a Rio return pump rated at 1090 GPH pushing 6 foot of head through 6 elbows and a check valve. At the head height (not mentioning the restrictions), the pump is rated at 660 GPH, and it would run my return chamber dry in less than a minute if I left it wide open. I am only looking for about 400-500 GPH of flow, so for my application this is ok. But if someone is looking for 800 GPH, you're not going to get it with this one.

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Used this on a 46 gallon tank.

++++

Never lost siphon (and I turn off my return pump to feed everyday)

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Loud

Lots of algae grow inside "U" tube, and U tube has to be cleaned every 8 weeks.

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kinda loud. its good if you cant drill your tank but if i could do it again i would get a drilled tank.

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