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Old 05-05-2017, 10:35 AM   #1
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Slow Drains

Good morning- one of the sink drains on our Nordhavn 55 is extremely slow to drain. We've disassembled (to a degree) and cleaned and used Zaal No-Flex and also baking soda/ vinegar. Sink is still super slow. What do people use to fix these plastic drains? Don't want to blast it with chemicals that could damage the holding tank and/or the evacuation pumps.

Many thanks!

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Old 05-05-2017, 10:39 AM   #2
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I would first check the drain hose to see how much slope there is in the drain line.
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Old 05-05-2017, 11:18 AM   #3
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I use a water hose to blast it clear
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Old 05-05-2017, 11:30 AM   #4
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holding tank?

Quote:
Originally Posted by bigpoppop View Post
Good morning- one of the sink drains on our Nordhavn 55 is extremely slow to drain. We've disassembled (to a degree) and cleaned and used Zaal No-Flex and also baking soda/ vinegar. Sink is still super slow. What do people use to fix these plastic drains? Don't want to blast it with chemicals that could damage the holding tank and/or the evacuation pumps.

Many thanks!

Jeff
M/C Long Time Dead
Puerto Rico
Your gray water goes to a holding tank? Mine goes straight overboard.

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Old 05-05-2017, 11:52 AM   #5
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Yep- to a 120 gallon holding tank- there's no option to pump overboard
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Old 05-05-2017, 12:06 PM   #6
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I have a piece .045 diameter stainless steel weld wire that I occasionally stuff down the drains. It is flexible enough to go around corners. FYI chemicals are going to flush right thru unless you plug the hose before the tank and let it soak.
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Old 05-05-2017, 01:21 PM   #7
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Water flush with hose or suck with shop vacuum. Hot water after to try to clean the drain
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Old 05-05-2017, 01:29 PM   #8
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I know .....I hate to question most owners experience and knowledge....

But I find it unbelievable a sink on an ocean crossing boat either doesnt have the option to drain overboard or into a large grey water sump that can be accessed to see if there is blockage at the tank end.
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Old 05-05-2017, 01:36 PM   #9
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Why not try a regular plumbers snake? One of the small ones for a kitchen or bath sink.
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Old 05-05-2017, 01:44 PM   #10
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Is there a vent in your gray water tank--occluded?
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Old 05-05-2017, 01:57 PM   #11
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Is there a vent in your gray water tank--occluded?
That would be my guess too..
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Old 05-05-2017, 02:01 PM   #12
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Raritan markets their "C.P. Cleans Potties" only as a toilet bowl cleaner, but it's also the best sump and drain cleaner on the planet. It's a bio-enzymatic cleaner than not only destroys odor on contact, but the enzymes in it "eat" the hair, soap scum, galley grease etc that build up in drains and clog sump pumps.

Somehow you need to block the drains so C.P. and water can stand in 'em at least overnight...the enzymes in it need time to work. Put 2-3 oz of C.P down the drain, then fill the drain up to the sink with clean water. It won't harm anything even if you leave it in the drain for month, it just won't do anything more after the first 24 hours. Open up the drain an run clean water through it.

If you have shower sumps this would also be a good time to put a few ounces of C.P down the shower drains when it can stand at least overnight. In fact, a weekly dose on most boats will keep sumps clean and sump pumps free from clogs...it's the only maintenance job on a boat that requires -0- manual labor.

If there are P-traps in your drains, there shouldn't be...they serve a purpose on land but just cause problems on boats. Your drains need to be as straight a route to the thru-hull and/or gray water tank as possible.

Discharging gray water direcly overboard is legal in all US waters except for a very few closed inland lakes that you're unlikely to visit. As others have suggested, you should have the ability to drain gray water directly overboard, 'cuz maintaining a black water tank is a walk in the park compared to maintaining a gray water tank! Why do it if you don't have to? A y-valve, a length hose and new above-waterline thru-hull is all you'd need.
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Old 05-05-2017, 02:01 PM   #13
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I used this in plastic drain pipe with good results. I did a pour thru, but if you have a shut off valve, it could soak.
https://www.amazon.com/dp/B001KTZ49W...494007079&sr=1
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Old 05-05-2017, 02:52 PM   #14
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Thanks- I'll try a snake and also the wet vac- the boat does not have option to pump directly overboard- only black water has that feature.
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Old 05-05-2017, 02:53 PM   #15
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I tried digesters but to no avail.
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Old 05-05-2017, 04:20 PM   #16
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Quote:
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Thanks- I'll try a snake and also the wet vac- the boat does not have option to pump directly overboard- only black water has that feature.


That is really odd. Seems backwards.
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Old 05-05-2017, 04:36 PM   #17
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Thanks- I'll try a snake and also the wet vac- the boat does not have option to pump directly overboard- only black water has that feature.
Then how do you empty it?
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Old 05-05-2017, 05:10 PM   #18
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If it's a bathroom sink it may be clogged with hair. You could try this:

Zip-It Bath and Sink Hair Snare-BC00400 - The Home Depot
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Old 05-05-2017, 05:36 PM   #19
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There is a mechanical pump and a manual pump to empty the grey water tank- same for the black water tank
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Old 05-05-2017, 05:52 PM   #20
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Baking soda + vinegar.. an acid and a base. creates a salt. Sodium acetate. kinda crusty. you want that in your pipes?
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