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As preface: I was on a 7-week trip this summer, almost always hooked up to city water. There was always water in the fresh tank, but I used and refilled it several times. I never used fresh tank water for drinking or cooking - just for washing dishes and hands and the occasional shower. Recently, I replaced the gray and black tank valves, so those tanks have been repeatedly flushed and emptied over the past few weeks. Plus, I only put liquids in the toilet all summer, if that matters. So: today, after draining and bypassing the water heater, I blew out the water lines with compressed air. There was very little water left. What was left, I drained into a white plastic flat bin - I'd say about a quart or so altogether. As I was finishing up, I noticed some little dark particles in the bin. Upon closer inspection, I saw that they were moving. Some sort of little bitty worms, or some damn vile thing. That's the photo, with a penny tossed in for scale. Though I wasn't planning to add anti-freeze to the system, I thought perhaps I'd see if the anti-freeze, alone or with additives, might have effect on the little buggers. To the water in the bin, I added a couple capfuls of household bleach. No effect. After a few minutes, I added a few ounces of RV anti-freeze, then left them sit about fifteen minutes. Nope. Added several ounces more bleach. They were looking very sluggish when I checked again so, by way of administering a coup de grace, I tossed in a few ounces of 70% isopropyl alcohol. Well, this gave the spawn of hell a new lease on life, apparently. They've now been swimming around in this chemical soup for over half an hour, and don't seem at all unhappy. *&^#%&! Anyone have any ideas about this? I searched the archives of the Toyota groups to which I belong, and the only reference to "worms" invariably followed "can of" or "bag of", in neither case literal examples. I'm sort of thinking the worms were developing in the bottom of the fresh tank which, though exercised all summer, hasn't been used for about a month and a half and was never fully empty until today. But I don't have any ideas. If you do, I would seriously love to hear them. Eek. Thanks, Dan