Yup, AF can get nasty.
It's biodegradable, so I'm sure you have a soup of bacteria and yeast.
a. Never put AF in the tank. Drain the tank, suck it out with a shop-vac, and then suck AF only into the plumbing.
b. Yes, flush repeatadly, then after 3-4 flushes, bleach is a fine idea. A 1/4 cup per 10 gallons is a good starting point.
Take heart. If you winterize properly you won't have these troubles next year.
(when asked how he reached the starting holds on a difficult rock climbing problem that clearly favored taller climbers - he was perhaps 5'5")
"Well, I just climb up to them."
by Joe Brown, English rock climber
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