Do I have a pyramid made of poop? A question for dry campers

I planned on leaving NY a few days ago but was delayed, I ways trying to make the black tank last by not adding any other liquid other than the water I need to flush. These are unusual conditions and normallyI would not spent 3 weeks or more between dumps. I have to stop off at Camping World in PA to get my A/C fixed then I will make at least 2 dump stops. I won't do anything to the tank before the first dump but I will probably try the ice cube thing after my first dump.