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Back Pressure on a LA-45C and on an LA-80BN


Ed R
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I only have 2 tanks running on the LA-45C, a 75 gallon that has two over-sized sponge filters, and a 55-gallon drum as a cistern/reservoir with a 4 inch airstone in it to keep the water fresh.. Without any back pressure relief this system is holding about 4.5 pounds of back pressure. How much back pressure do you think this pump should have to deal with? 1.5 is the lowest i can go without the output to the tank and the bubble production being greatly reduced. My pvc isn't a loop, it's a 5 foot long piece of 2 inch pvc.  I figured that running a loop system here would probably not be worthwhile.

 

I've also got a 22-tank fish room under construction, and have an LA-80BN to run that. Should I be looking at the same amount of back pressure, around 1.5? I will only have tanks on one side of the room, but I can run a loop here if it's been shown that it helps even out the pressure across all tanks. Is there a video or an article or some data I could look at to compare the performance of the pressure at the tank in a loop system vs a single-run system?

 

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quick followup, short answer: It's complicated. Has to do with the length of the longest drop in the run , or something. When I can explain it to myself, I will let you know.

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