This is just a bit off thread... But I would be concerned. My money is on a load of lower quality water...
I have left our AS for a few months and there was no issue with the screen doing that. I would recommend NOT using that water until you solve the reason the screen is doing that.
Perhaps the screen is defective...does the contaminated screen have any odor to it? If so, I would nuke the water tank, drain, repeat. Then rum a load of fresh thru the tank...
Have you been trained on treating the fresh water system??? Not trying to bring discontent... Just trying to understand where u are coming from...
For instance, where do you get the fresh water? How? Filled with Garden hose or dedicated water hose? Does water hose have a filter??? Have you filled tank with water at a park dump staion? How long does the water sit (stagnate) between uses? Have you owned since new???
I run a dose of "non scented Clorox" from m the tank, thru the system...'if your sink aerators slow down, some goop has been removed from m the tubing... Could be biological or non organic...(calcium, iron, etc)
Hope it gets resolved...Soon!
Peace and Blessings..