In general, bar soap will tend to have a tendency to leave deposits in a sump system sooner than liquid soap.
This is the case because bar soap resolidifies on surfaces when it dries. We (when I say "we", I mean Bess
)cleaned the teak grates of Skinny Dippin' a few months after we bought her 2.5 years ago. There was caked soap scum stuck on there like glue and it took two tried to get it all off. Since then, we use liquid body wash and the grates, drain, walls, and sump are all in perfect condition. Once a month I'll grab the Shop-Vac and suck the water that the pump doesn't get out of the sump and clean it up real nice. I need to add a check valve to it and the cover has been gone since we bought it, but otherwise... no problems.