Hi Jim
Now that is interesting to hear. I always prefer to take the advice of those who have personal experience.......
I never had much issue with the black tank, I also much prefer the "free fall" method as I think it discharges much better and the fuller the better. Being weekenders I do expect to get a bit of a smell from the black tank,as it sometimes does not get dropped for several weeks, but it has always been acceptable to me ( I have dealt with worse whilst at sea
) however the grey tank is absolutely heaving. So much worse than the black.......
I will probably try the Geo method on our new RV grey tank, but continue with the same method as you with the black tank, unless it is stinky, then I will try the Geo method and see what happens then
What a wonderful Sunday lunchtime discussion
Keith