Go over to sailboatowners and look in their store for 
Peggy Hall’s book on boat odors. It’s great.  

The shower should use a common drain with the sink.  The sink/shower drain are right next to each other so maybe he got confused.  The head inlet should have a small filter to prevent big stuff form plugging up the pump.  Note bothe of these are “raw” water not connected to your potable supply.  If your getting stinky water from the sink you may need to shock the system. 

There should be no odors in your boat boat and if so Peggy’s book is the Bible for removing them

Les

Go over to sailboatowners and look in their store for 
Peggy Hall’s book on boat odors. It’s great.  

The shower should use a common drain with the sink.  The sink/shower drain are right next to each other so maybe he got confused.  The head inlet should have a small filter to prevent big stuff form plugging up the pump.  Note bothe of these are “raw” water not connected to your potable supply.  If your getting stinky water from the sink you may need to shock the system. 

There should be no odors in your boat boat and if so Peggy’s book is the Bible for removing them

Les

Mark,

I had the same problem when I purchased Slip Away and it stinks!  Look in your manual or google how to sanitize your freshwater tanks.  Basically fill your tanks and add bleach/chlorine, let sit, drain and rinse.  Then as you fill periodically throughout the season add a capfull to keep it fresh.  No more smell for us!  Make sure to run hot water side so as to also circulate through heater.  Not sure how 2001 shower drains but our 1996 drains into sump in floor which has its own bilge pump and is pumped overboard via a switch for pump.  Rinse and clean, rinse and clean, rinse and clean...... you get the picture.  Our drains had a smell to them,  rinse and clean,  close through hull valves, add bleach and let sit, rinse and clean.