I have not used the product mentioned in your post. However, I do use a macerator (Sani-Con). My macerator has a grey water bypass. For me, a macerator without grey water bypass is useless. I can not comment on the difference between the CDWBK and CDDK.
2005 Newmar KSDP 3910 + GMC ENVOY XUV 37K lbs Moving Down The Road
The Avatar Is Many Times Around The USA
Nobody Knows Your Coach Like Somebody Who Owns One Just Like Yours