I m not on board with tha advanced length affecting how long the roll lasts. I have had mine from very short to long. While I had a dino outbreak i tried differing values and the end result was the same - quickly burned through rolls. Dino's went away, rolls lasted longer. I am currently at 3.0-3.2" advance and I just replaced a roll after 42 days (daily avg is ~24").
My theory is this - the amount you adjust affects only how often the motor runs. If you adjust a very small amount - say 0.5" - you are only removing that .5" AND adding a very small .5" of clean. Water level will drop accordingly and advance again - quickly - for another .5". Move to 3" - now I took out a lot more dirty, AND added 3" of new - water level drops LOWER than with .5" advance AND takes a lot longer to advance again. Now, given the time difference between advances with .5" vs 3"? Is it really making a difference? I am not so sure that advance length plays any role in how much you use. I believe it purely dictates how often your motor runs. I would love to see a test (somehow) on IF it makes a difference in nutrients - I am not seeing it.
My theory is this - the amount you adjust affects only how often the motor runs. If you adjust a very small amount - say 0.5" - you are only removing that .5" AND adding a very small .5" of clean. Water level will drop accordingly and advance again - quickly - for another .5". Move to 3" - now I took out a lot more dirty, AND added 3" of new - water level drops LOWER than with .5" advance AND takes a lot longer to advance again. Now, given the time difference between advances with .5" vs 3"? Is it really making a difference? I am not so sure that advance length plays any role in how much you use. I believe it purely dictates how often your motor runs. I would love to see a test (somehow) on IF it makes a difference in nutrients - I am not seeing it.