Originally Posted by David M
The less prone a sanitation is to clogging, the better.
I would put in 6 inch hose if it would fit.
From doing a little plumbing work
, installing sewer systems etc.
You can go too big, too big and the solids settle out and stick to the bottom.
With sewer systems the grade has to be within limits too, too steep and the liquids run off, too fast leaves the solids behind, too shallow and they settle out.
If it’s pumped or pressurized by any means, assumption is a smaller hose may be better as the higher velocity flow can keep it clean.