Ok I know and understand square footage of the media beds, its an easy calculation if you have 4 x 8 x 1 ft bed then you have 32 sq ft. When you calculate fish/sq ft ratio its usually 1 lb/sq ft of media grow bed.   My question is how do you do the same type of calculation for NFT pipe beds. If you have lets say 100 ft of 4" pipe with 2" holes for the 2" net pots how do you calculate that to find…