Hi, I have a two tank system and have been going for about 30,000 miles with only minor "user error" problems (like putting in dirty oil and clogging everything up). I have been cleaning wvo in 55 gallon drums; heating it and then passing through a 200 micron filter and then cfing it; and it works just great; my on board racor 2 micron filter goes for about 2,000 miles before needing to change it. The problem is I want to be able to clean about 250 gallons at a time; this is about how much I use in my delivery F250 conversion in one month. Any suggestions as to the best type of cf or other method to implement for this? I have two cf's running now, a 55gph and a 60 gph; it takes about 12 hours to clean 45 gallons and cleans it really well. Any suggestions on improving efficiency and volume would be appreciated.