idea for overflow
i have a cool idea for an overflow, i have a cpr backpack protien skimmer, and i was wondering that if i drilled a hole just under the origanal exit, and ran my plumming down to my sump whould work. i would have a slightly larger return pump to compensate for pumping up to my tank
if the return pump burns out or fails the skimmer overflow your talking about will continue pumping flooding your floor.
i thought about that after i got off last night, and i am wondering if there is a way to make an auto shut off system or something. do you know of any?
There has to be a way... I don't sleep because of this same issue running through my mind.
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there are plenty of ways. getting an overflow box, drilling the tank, using a reef ready tank
you may be able to rig some sort of float switch up, but i personally would NOT trust rigging anything. if you think about it, all the gadgets and things that it takes to get your overflow i personally think your better off drilling the tank. im a big fan of www.glass-holes.com
The idea of that onefish is promoting is simple: gravity controls the overflow. Water is pumped into the display, and flows over a baffle and the drain is gravity fed. Therefore only water pumped into the display can flow over the baffle. If your return pump malfunctions, then water will stop being pumped into the tank and cannot flow over the baffles.
With a drilled aquarium, you do not have to worry about a siphon break. That makes this the best option. If you have a power outage, water will stop being pumped into the aquarium (the reverse action of the return pump in a power outage will cause water to be siphoned the other way, so be careful of that) and no water can flow over the baffle. With a Siphoned Overflow when water flows over the baffle, it is then siphoned over the aquairum wall and flows down into the sump. When power goes out, that siphon is broken and needs to be restarted when the flow starts again. There are continuous models on the market, like the CPR CS series, which use an air-lifter pump to restart the siphon in the case of a power-outage. I have also seen DIY versions of this just surfing the net.
Oversizing your sump is safer than a float switch. By which I mean, figure out how much water your siphon will draw off before it breaks. So for instance, in a 12x30 tank with your inlet 2" underwater, it'll draw off 3.1 gallons. Add the water in your plumbing, and make sure you sump has that much extra capacity. Then if the pump fails, no flooding.
Make sure you go the other way too. What if the siphon breaks? How much water will the pump move before the sump level goes below the pump inlet, make sure your tank can hold that much extra water.
You would probably want a pump that is actually underpowered compared to how much the skimmer will allow the level to drop, if the pump is putting more water in the tank than the overflow can drain, you're just going to end up raising the level in the tank until it starts flooding.
That's the pvc overflow I just put together, you can use different size tubing, don't know how big your tank is, but I used 1" for my 55, you could maybe go smaller if you have a small tank, but i don't see it as being that big of an intrusion.
(the plumbing on the inside is not glued, but the outside is, that way I can adjust the piping inside of the tank, because it seems unclear even from tutorials whether I should have the lowermost part on the inside or outside of the tank)
I had thought about using a protein skimmer for an overflow box, but it just ended up seeming easier to build the whole thing from pvc and know everything would work right without a huge fight.
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