I did a Lipton tea bag mod on one of my carts last night. I love it, only problem is I can't tell when I need to top it off so I usually do it after about 10 hits or so. I just opened the cart and noticed the tip of the filler is turning brown. Does this mean I'm not topping off soon enough (there is still alot of juice inside) also, if this filler need to be changed do I just lose all the juice that's at the bottom of the cart? still very very new to this so any info is great info. Thanks as always.