Can a 3/4 HP 5 GMP pump backwash a 10 inch greensand filter?

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Npn

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The pump that the well driller installed after drilling the well deeper is labeled 3/4 - 5 (written on the pressure tank). The pump is at 390 feet and the static water is about 110 feet down. After researching media types I see back wash rates in the range of 8 or more GPM. I am now getting nervous that this pump will not be able to backwash most media I would use in the tank.
The filter tanks seems to be 10 inches, so that makes the area about 0.79 sq ft, so I think I get 6.4 GMP for backwash best case, right?
 

Reach4

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Not enough IMO, even tho 10 inch tank cross section is 0.5454 sqft.


How much iron are you dealing with? My 10 inch iron+H2S filter uses Centaur Carbon, and backwashes at 5gpm. My iron is fairly light (under 0.5 ppm). My H2S I don't know numerically, but I wanted that out. Also not particularly heavy, but I did not like it.
 

Npn

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The pump that the well driller installed after drilling the well deeper is labeled 3/4 - 5 (written on the pressure tank). The pump is at 390 feet and the static water is about 110 feet down. After researching media types I see back wash rates in the range of 8 or more GPM. I am now getting nervous that this pump will not be able to backwash most media I would use in the tank.
The filter tanks seems to be 10 inches, so that makes the area about 0.79 sq ft, so I think I get 6.4 GMP for backwash best case, right?
oops stress and Sunday morning ... tank area is as @Reach4 stated 0.5454 soft not 0.79
 

LLigetfa

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I use FilterAG that requires less GPM but is a coarse mesh. I am considering adding a finer mesh KL which requires a little more GPM. My GPM limitation is the micronizer, not the pump.

Edit: Originally I had a 5.3 DLFC but replaced it with a 6.5 DLFC.
 
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