Refugium for non-drilled tank
- Thread starter mangelo
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ILoveReefer
Premium Member
Hang on back overflow AKA HOB. http://www.marinedepot.com/ps_ViewI..._Box-Saltwater_Aquarium_Supplies~vendor~.html
Marine depot gives an OK description. I basically uses an air pump to start a syphon.
Marine depot gives an OK description. I basically uses an air pump to start a syphon.
Aquarist007
New member
Re: Refugium for non-drilled tank
its gravity feed for the drains
eg a one inch drain pipe can give you a flow of up to 600 gph
its gravity feed for the drains
eg a one inch drain pipe can give you a flow of up to 600 gph
Aquarist007
New member
ILoveReefer
Premium Member
This is for a non-drilled DT.
freedominco
New member
Why? As long your sump has room for the extra water you will be fine.
no problem with it failing, this is why
if the return fails the water flowing back to the refugium can only continue to flow until the water level reaches the overflow box bottom level, as the overflow box is probably only 1" or so below the water level not much will drain back, and as mentioned above if you have enough room in the refugium to take the water which can feed back from the dt then there is noway it can over flow, water cant flow uphill on its own, if the tank is drilled and a overflow not positioned correctly then it can be a problem, however with a overflow box which i have i find the problem can be the other way around, after switching back on the return pump the water is pumped back to the dt and if the priming pump failed then the whole contents of the refugium could end up in the tank, if the water is large and the dt level quite close to the top then it could be a problem, you need the priming pump to start so the water once its reached the overflow box level pushes the water back to the sump to stop this potential nightmare from happening, the best bet would be a drilled overflow pipe 1" above the dt water level, so if the water is pushed back to the dt then gravity would ensure it is taken back to the refugium until the priming pump started again,
The pump should flow into the tank at a rate within the capacity of the overflow(eg 600gph per overflow tube).
Overflow boxes run on a siphon. Some are more reliable than others in maintaining siphon.This is the critical point in the water flow . If the siphon breaks(air enters the tube and blocks flow), the pump has no way of knowing this and keeps pumping water which will overflow out of the tank until the pump is left running dry( which can damage it) from the water leaving and not returning to the sump.using gravity in a a drilled tank is strongly preferred by most to overflows because no siphon is required as water will always flow through the drilled hole unless of course it is blocked by an animal (snail,anemone,etc.) CPRand othe so called continuous siphon overflows are highly unreliable at maintaining siphon. J/U tube types are much more reliable. I had to trash several contiuous siphon overflows after several floods and have used U tube types for about 5 yrs without a siphon break even when the power goes off. It is even safer to use two overflow devices ,each with capacity to handle the entire flow of the pump.
If the pump stops, water will flow into the sump and stop when the top of th overflow box is reached. So as noted in above posts you need to plan your sump with adequate capacity for this event.
Overflow boxes run on a siphon. Some are more reliable than others in maintaining siphon.This is the critical point in the water flow . If the siphon breaks(air enters the tube and blocks flow), the pump has no way of knowing this and keeps pumping water which will overflow out of the tank until the pump is left running dry( which can damage it) from the water leaving and not returning to the sump.using gravity in a a drilled tank is strongly preferred by most to overflows because no siphon is required as water will always flow through the drilled hole unless of course it is blocked by an animal (snail,anemone,etc.) CPRand othe so called continuous siphon overflows are highly unreliable at maintaining siphon. J/U tube types are much more reliable. I had to trash several contiuous siphon overflows after several floods and have used U tube types for about 5 yrs without a siphon break even when the power goes off. It is even safer to use two overflow devices ,each with capacity to handle the entire flow of the pump.
If the pump stops, water will flow into the sump and stop when the top of th overflow box is reached. So as noted in above posts you need to plan your sump with adequate capacity for this event.
