Originally Posted by Sid1
Reply to peghall
Yes, the odor is worse after first flush and only slightly better after several flushes.
Type of hose used for the intake has nothing to do with it. It's a complete coincidence that immediately after you replaced the hose, you managed to pull some animal or vegetable sea life into your intake, where it died and is decaying. Black flecks in your flush water would help to confirm this. Because it remains pretty "ripe" even after you've flushed when you come back aboard, I suspect it's animal life...it may even be trapped in the channel in rim of the bowl. I've seen a lot of weeds and more than a few minnows...but the worst intake odor I ever experienced was the remains of a baby octopus!
The cure: Buy a quart of distilled white vinegar...remove the intake line from the thru-hull (prob'ly would be a good idea to close the seacock first) and stick it in a bucket of clean FRESH water to which you've added the whole quart of vinegar. Flush the whole bucketful through. Follow that with a couple of bucketfuls of clean fresh water. That SHOULD clean out your system...if you still have odor, it may be necessary to remove the bowl and put it on the dock
to blast out with a hose. You might want to put a strainer in you intake line, near the thru-hull...or....
There's a pretty simple and inexpensive way to eliminate intake odor problems...several sailboat builders have plumbed boats this way to eliminate one hole in the boat and save the cost of a thru-hull and seacock: reroute your head intake line to tee it into the head sink drain line immediately ahead of the seacock...the tee needs be below waterline. This will let you flush the toilet with sea water, same as always. You may need to keep the plug
in the sink to prevent the toilet from pulling in air that interferes with the pump
priming. When you're ready to leave the boat, after you've closed all the thru-hulls, fill the sink with clean fresh water...flush. Because the thru-hull is closed the toilet will pull the water out of the sink, rinsing all the sea water out of the WHOLE system--intake line, pump, channel in the rim of the bowl AND the discharge. Just putting clean water in the bowl only rinses out the discharge line.
Works just as well at eliminating intake odors as using fresh water all the time, but conserves your fresh water and costs a LOT less than a new toilet!