Interesting. I run my drip system through 2 whole house filter housings with carbon block sediment filters, 5 or 10 micron. I have a small issue of by the end of a 24 hour period 1 out of 2 of the filter housings run dry, yet the drip continues at the same rate. I cannot seem to control the drip anywhere other than the initial tap I have doubled, its open just a hair. So I have it on a very very slow drip, so I don't know if it is evaporation or if the drip is so slow it is not filling the filter and bypassing, but everyday after work I have to hit the pressure release button for it to backsiphon and fill back up. I would go with a filter like the filter guys 60gpd one, however in case that I want more dripping or want to do a water change using the drip system I don't want to be limited. I tried adding a 25PSI regulator after the housings, didn't work. I know chlorine dissapates with aeration, I have 3 air stones in the tank and I drip water right on the air bublles. I know small ammounts of chlorine don't have immediate affects on the fish, it is more long term issues like how long they will live and particularly how it effects gill function and breathing over the course of prolonged exposure. I always wondered if I should stop bothering with the cartridges that don't seem to be doing anything if they are getting bypassed anyway, for the life of me no matter how many ball valves I use I cannot seem to find a way to get a 75 gpd drip and not have the filter housings empty on me, don't know what I am doing wrong but I can't control the drip down the line, ball valves don't seem to reduce the amount of water that comes in just increase the pressure it comes in at. PITA, I flipping hate plumbing 
