Need help building my Sump

dhughesz28

dhughesz28

Member
Hi All, I need some help putting together my sump.
First, here are the specs of the system:
75G RR AGA
20L sump tank
AGA overflow rated at 600 gph
Return will be powered by a Mag9.5
Here is my sump plan.

My question is how high should the baffles be for the bubble trap? See the red x and y dimensions in the diagram. Also, what spacing should I have between the bubble trap baffles??
 
chuckcac

chuckcac

Member
hi there...
the x & y dimensions should be the same since you have setup skimmer > fuge > sump
you may have to build a small stand at the bottom of the skimmer area to lift the skimmer to the correct operating depth...
what are the dim's of a 20L ? :notsure:
 
chuckcac

chuckcac

Member
ok... :thinking:
just make sure that when you design the baffle heights, that you leave enough room for back wash in the event of a power outage...
for example: if power goes out, the return pump will no longer return water to the DT. you need to have enough room for the water that will drain to the sump/fuge...
so if your baffles are 8" tall.... you will have 4"x12"x30" backwash area or 6.25 gal.
if your display drains to the level of the overflow baffle you need to add up
1. water in DT that will drain to the level of the overflow
2. water in overflow
3. water in the pipes that will drain into the sump
if that is greater than 6.25 gallons, you need to make the baffles lower... if it is less than 6.25 gallons... you are good to go...
 
dhughesz28

dhughesz28

Member
Thanks for your reply. So x and y should be the same?
To answer some of your questions, there is a suction break in the durso tube in the overflow. However, there is no suction break in the 3 / 4” return line. I only planed on having the return nozzle 1” below the water surface, so at most, only the top 1” of the DT would drain into the sump , assuming that the pump will allow water to drain back into the sump. So I figured, with the water in the plumbing and the top 1” of the DT (18”x48”) I have about 4 1/4 gallons of potential drainage that my sump would have to handal. So, If I have the two baffles at 9” that would leave 3” of space or (3”x12”x30”) which would be around 4.7 gallons.
The only problem I see with this is this assumes that the water level is even with the top of the baffles. The thing is, with evaporation, as soon as the water falls below the height of the lowest baffle on the right (fuge and skimmer side), the side of the sump with the return pump will go dry and no water will be returned to the DT. Wouldn’t the baffles need to be designed to allow for evaporation?? I’m thinking that regardless of the height of the baffles, as long as the overall water level in the sump is low enough to accept and DT overflow, I should be ok. So I’m thinking that the two baffles should be around 7” high.
 
chuckcac

chuckcac

Member
when evaporation occurs, you will see it happen in the return pump section only...
so , yeah the 7" baffles should be sufficient...
make certain of the operating depth of the skimmer too.... if that needs 8" it could pose a potential problem... if it needs less than 7" you could make a little stand to raise up the skimmer (check for clearences to be abel to remove the collection cup)
here are the pics of mine so far... it's not yet in operation, but the construction is moving along well
here is the drawing...

and this is the final (successful) water test...
 
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