Yeah, there is a faint smell from the tank.
It is also empty in between sailing trips as I drain the tank into the bilge
and it can sit empty for a month at the time.
Before filling it up for the next trip, I usually "rinse" with fresh water by leaving the drain open while I let the hose go full blast in the filler opening...(For lack of a better word)
Have also tried to keep it partially filled with some extra chlorine, then dump it before the next trip, then fill it with fresh water, etc.
The first day on the boat the water taste and smell normal, but that strange taste and smell usually comes back after a day or so, then stays for the reminder of the trip.
That rules out any contamination from the garden hose and filler neck.
As for describing the taset/smell...Hmm, slightly moldy with a twang of artificial smell...Not very strong and not very unpleasent, just a bit annoying.
The original factory coating in the tank is gel coat as per The Architectual Specificatons:
shall be Glidden-Durkee polyester resins which meet the requirements of the US Food
and Drug Administration and National Sanitation Foundations Standardsas not imparting non-palatable odors, tastes and colors.
The gel coat shall be sprayed evenly to a thickness of 18 to 22 mill."
(The above is for the whole boat, not just the water tank.)
Yes, I have thought of doing a complete surface job in the tank, but for now I am trying to do an easy way out...It may after all not be anything wrong with the surface.
In fact I have been sniffing every part that came of the tank to try to "identify" and pin-point the smell.
The last inspection
plate that came off have a some white caulking around the gasekt for the tank level sensor, and that stuff smells just like the water, except much stronger.
I put in the sensor about 4 years ago, but have forgotten what I used for sealant
So the plot thickens, I am somewhat thinking that the caulk may be the culprit as plenty of it was in touch with the water.
The old sensor was plastic, but I got a new one with a new gasket
, and the new sending unit is SS.
Asked the manufactor if the rubber gasket
was "food grade" and he was pretty sure it was as they ship em out in the thousands to sail and power boat
manufactors all over the planet and have had no complaints...So there..
The next step is to look hard at the few caulk seams in the bottom of the tank and perhaps pour some epoxy resin over them to seal and secure.
Have also started looing into what materials is suitable for partial coating of the bottom and the sides..heard from one guy that it is really nasty stuff and that a respirator is need to apply it.
more before I close up the tank.
Also looking to use rubber gaskets on the inspection
plates to minimize contact with sealants, but need some food
grade stuff to seal the thru hole in the bottom as the surface is way to un-even to trust an O-ring to seal it..
Thanks for the comments and the suggestions.