Filtration plumbing question

00kevin

Piranha
MFK Member
Nov 2, 2011
201
145
76
NJ
Perusing the never ending supply of youtube videos on giant tank filtration I noticed a lot of people use rain barrels. I've always believed that overflows should be gravity fed, hence sumps underneath of the tank, and the entry to the sump should be the lowest point. Thus the reason I use low, long tanks like a 125. A lot of setups involve a overflow that drops down to the floor and then comes back up to the top of a barrel. Do you guys think this is fail proof? If so, I'm installing taller sumps ASAP!


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houie925

Candiru
MFK Member
Nov 12, 2008
827
8
48
Manteca, California
as long as the water level in the sump is lower than the water level in the tank it can be gravity fed and fail-proof. I believe there's a sticky on pipe sizing and there's a minimum drop to achieve maximum flow so in some cases larger plumbing may be necessary for achieving the same flow rate when the water levels are more similar.
 
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