Wow. My feeder is one of those 5 gallon metal feeders that hangs from the ceiling. I haven't cleaned it out in months. My 5 gallon waterer gets cleaned out when I refill, usually about once every two weeks. It's staying cleaner now that it is out in the run (rather than inside with the wood chips and dust). I also use a bit of ACV in it. I've never had algae form in it?? I can't believe how cleanly you guys are. My chickens are livestock, but they're very healthy and get very well fed. (My eggs are really hard compared to others nearby... I don't know whether it's the minerals ~ they have unlimited oyster shell, which I must say doesn't go down very fast ~ or the fact they are on pasture??)