what_barnacles
Guru
at first glance the pvc doesnt look secure enough to take rough water. maybe a joint has broken the glues bond and when flexing it lets odor out.
-During weather with boat bouncing around fouls smell was traced to seal water being knocked out of sink or shower traps allowing gray water odors into the boat, easy fix just run a quart of water down the drain to refill the traps, they are called traps for a reason, long term install deeper traps.
Neither of those were on my radar, most likely because neither gray water tanks nor P-traps are common on boats <50', which is 99% of 'em (95% of registered boats in the US are <35').
But a lot of what goes down sink drains, especially galley sinks (food bits, etc), doesn't...compounded by cooking grease etc. Add the soap scum, body oils, bacteria etc in shower water and you have a unmanageable primordial soup! I've yet to come a cross any tank "treatment" that does much to help.
OMG that was 25 years ago! Those were the days, my friend...great memories.
Fwiw, C.P. is part of the product line Raritan bought from me in 1999. So I'm very familiar with it.
Have a 56 foot Carver docked next to me and boy did his blackwater tank stink. I said something to him about the oder on the dock and he seemed dumbfounded. The next day he mentioned he put bleach down the toilet to kill the odor. And the oder did stop.... Now over a month later the oder is still gone. So, I would think the bleach killed the bacteria that was stinking, but got me to thinking once the bacteria was dead how long would it take for the smelly bacteria to return? Also once the smelly bacteria is dead what should he do to grow the good (not smelly) bacteria? Was his solution a good or bad idea?
Maybe he added a carbon filter into the vent line. That does work