Waste water

[Mutantratt]

Hi all,
I have a 2005 2400scr. When someone uses the bathroom we get a sewage smell off the bacvk of the boat. Really is gross.

Any suggestions on how to fix this?

[mmwjr]

As long as no hoses are leaking a vent line filter may help.

[yahoo82]

Always had good luck using powdered laundry detergent. Flush a cup down the toilet once a week or at pumpout. It’s the method recommended by vacuflush. Also, as Mike said check the vent. The tank actually needs to breath to reduce the smell. Oxygen = no smell, no oxygen = smell. I installed a big orange filter and it’s cheap to refill with activated charcoal from anyplace the sell fish/aquarium supplies.

[Mr Hemi]

Likely your vent line is plugged.
Dont ask.
Pull the line at the top of the tank and push something through it, mine was full of toilet paper.
You wont be able to push it out the end, but your figure it out.
It fixed the smell, but also fixed the toilet from back filling with waste, even with new valve.
I have similar boat.

[shrew]

IF there was a leak in the sanitation plumbing the boat would smell all the time, not just when flushing.

If the holding tank vent line were clogged, then flushing and pumping out would be a problem, however odors when flushing would not.

When you put a gallon of fluid in a tank, a gallon of air needs to be displaced. This occurs through the holding tank vent. If you're getting odor when flushing specifically, then install a holding tank vent filter and change it every 6 months.

https://defender.com/en_us/dometic-d...idge-309311004

[viper12161]

Out of curiosity, are you using sea water when flushing? I found that leaving the seacock closed and just using the fresh water from the sink faucet to fill the bowl made a HUGE difference. I also put a little Biokleen M01709 Kleen Waste down the bowl and flush. Never have an odor on board.