Ive been thinking of ways to make the most efficient filter out of 2-3 50 gallon drums. i've been researching all different kinds of filters people make with 50 gallon drums for months but i still cant decide which approach I want to take. I saw a video that greg jones has in his youtube channel (the link to the videos below) and I like that design but I am also trying to keep the cost down. I also know swirl filters are another option but i don't know if it would be as good. If anyone has any ideas on what would be the most efficient in cost and filtration I would love to hear it! btw the setup is for a 350 gallon setup running 2 tanks.