I am not sure I ever had a 6 although I put that down, but certainly a 5+. I am at dialysis now, and I came in with 1kg on.
Most was 4 kg after a weekend away with my wife. Yesterday I came in with 2.9 kg and they took off 3.2 kg ( I didn't ate my dessert). BTW do you count the weight of food or drinks you're having during dialysis? In that case they took 4.7 kg.
As for food , I never count it because i still poop ;-)