Originally Posted by nicolasalan
We get some pretty obnoxious smells every time we flush the head for about a minute afterwards.
What tank product are you using? That can be a major factor, but the wrong product is only part of the problem
As for any holding tank vent line filter...do you even know whether there actually is one? To find out, find your holding tank...the line is the smallest line coming off it, at or on the top of it...trace it to the hull (USCG regs require that holding tanks be vented to the outside of the boat, so it WILL terminate somewhere on the side of boat, or the transom). Hopefully you won't find one...but if you do, remove it and do NOT replace it....they're outrageously expensive and actually help to cause the very problem they're sold to solve (if only I could have come up with a product that does that!!) because they impede the flow of air needed to keep the tank aerobic, which is essential to PREVENTING tank contents from creating odor...the ONLY way to eliminate odor--which IS possible, although some minor modifications to the tank vent and and different tank product may be needed.