Larry, I agree with Richard's comments. I try to ONLY fill up at major truck stops, primarily Flying J (truck island rather than the RV island). I try to make sure that they are using a filter on the pump, although I had to fill at one truck stop that didn't have the external filter on the pump and that could have contributed to the problem. It is always a crapshoot at any fueling station.
Keeping the tank full when it is parked for a while is a big help. I am not as good about that as I should be.
There are those who never use any anti-algaecide. The dryer the climate where your coach is, the more likely this approach will work. In coastal areas, I would be concerned about the inside of the tank turning into a giant slime holding basin.
I routinely have my filtered changed by Newell once a year when they do the annual maintenance. That is typically about 15,000 miles. This time, mine were plugged up by about 12,000 miles.
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