How to discharge grey water overboard

Discussion in 'Classic Sea Rays' started by Magu, Aug 7, 2019.

  1. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    Hey guys, fresh new here, me and my wife just bought a 1976 Sea Ray Weekender 300 for liveaboard. We're trying to empty the grey water tank overboard, but are unable to find a switch to do so. Any tips?
     
  2. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    You very well may not have a grey water overboard discharge. That would completely negate the reason for having a grey water tank to begin with. You would need to go to a pump out station and they would suck it out (a shop vac on steroids) through the deck plate.

    Unless... are you talking about the black water tank? That can only be pumped out, legally, once you're certain distance off the coast and your boat would have to have a macerator - which you may or may not have.
     
  3. Mr Mac

    Mr Mac Member

    41
    Feb 27, 2019
    Apollo Beach, FL
    1997 330 Sundancer
    Name Slàinte Mhath!
    Twin 454 Mercruiser with V-drive
    Welcome aboard! If you are a live-aboard in a marina that offers that option, there should be a pump out station (if not at your slip) where most are free. That said, tip the fellow who does that for you and you won't have to clean your hull!

    Another option is where you fuel. Our marinas all seem to have a pump out hose at the fuel dock and they do not mind you using it at all.
     
  4. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    yes, there is a macerator and sewage tank .
     
  5. SeadawgVB

    SeadawgVB Active Member

    276
    Jul 8, 2013
    Tidewater Virginia
    '03 Sundancer 360
    Twin 8.1s with V-drives
    Typically on these boats the gray water flows by gravity or by a sump pump over the side. Black water tank is a whole different ballgame. No pumping (macerator) unless out at sea by several miles. (I think three is the requirement.)

    Gray water = sink, shower, A/C condensate, etc.
    Black Water = sewage
     
  6. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    Yes we're legally able to discharge at our location, just learning the boat operations as we cannot find the manual anywhere.
    For sure it's designed to pump out with "y" switch operations and macerator pump. Can't find the on and off for it on this particular model
     
  7. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    yes gray water goes over board and we got holding tank system with macerating pump beside it. Aka waste pump.Where is the switcher for it ???? Can't even find the fuse for it
     
  8. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
     
  9. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    I'm not sure if the marina we're at has pump out service, but i'll
     
  10. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    Still a little confusing what you actually have what, specifically you are looking for. Can you clarify if you have...

    -- Grey water holding tank
    -- Macerator for grey water tank (again, this would be REALLY odd)

    Or, are you really referring to the black water tank and it's macerator?

    You may have a switch (toggle, whatever) for the black water macerator... or it could be a "key switch". Anything like that? If you want, take some pics of your dash, breaker panels and anything in the head that looks electrical.
     
  11. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Some of the old Sea Rays had a system that was called a "treatment" system and had a breaker on the DC panel labeled "treatment" that started a treatment/discharge cycle. It was a complicated system and almost all of them have been replaced with a simple waste holding tank that is connected to the deck pump out fitting and sometimes a discharge/macerator as well. In my boat the breaker that activates the discharge/macerator is labeled "treatment so check to see if you have that breaker. I am familiar with that old system because a friend has a 1986 340EC that still has that system and it still functions.
     
  12. sbw1

    sbw1 Well-Known Member

    Oct 10, 2006
    West Michigan
    This is listed in my signature
    This is listed in my signature
    IMG_4230.JPG Macerators work as follows: open a through hull seacock in the bottom of your bilge that has a sewage line running from it to a macerator pump. The macerator will have a sewage line running from it to the sewage tank. Once you have the seacock open, look for D.C. breaker labeled macerator, or pump or treatment. Turn that on and the macerator pumps the sewage tank out. When done, turn the pump off and remember to close the seacock.
     
  13. Korkie

    Korkie Active Member SILVER Sponsor

    554
    Feb 2, 2016
    Leonardtown, MD Potomac River / Chesapeake Bay
    340 Sundancer 2006, Garmin 7612, xHD Radome
    Merc 496 Mags
    Bravo III Drives
    Not sure if you are at a marina or what. You need to double check your discharge of sewage waste overboard regulations. I do not know of any marina I have been to that allows it. USCG requires that the sea cock for the overboard pumpout be properly secured (locked in some fashion) to prevent accidental opening at any time you are not the required distance of shore.
     
  14. brewster16

    brewster16 Active Member

    403
    Aug 9, 2009
    Long Beach Island, N.J.
    '07 44 Sundancer
    Twin Cummins QSC 8.3
    As stated above grey water is sinks, showers, AC condensate and these drain out by gravity or a sump pump/float switch. That is all automatic on modern boats. It does not require you to operate anything manually. As for black water, which is sewage, it is collected in a holding tank which as others have told you needs to be pumped off your boat by your marina, a mobile pump out boat or a fixed pump out station at most marinas. Finally, manually pumping your sewage/black water is a no no. We have a switch in our electrical panel called “discharge” which will evacuate the holding tank overboard but I have never and will never use it. In fact, as per regulations, I have zip tied the valve in my bilge which would allow for that operation. I hope this helps you understand the system.
     
  15. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor GOLD Sponsor

    Apr 21, 2009
    PA
    Various
    Various
    One note for those of you that may never have seen this, before... but there COULD be a "grey water holding tank". It's not very common, but it is a possibility - hence the reason I was looking for clarification... or possibly the OP was just using the wrong terminology. Often the grey water is simply pumped to the blackwater tank, but I have seen a separate grey water holding tank... plus, the boat is old enough to fit into the "who knows what's been done over the years" category ;)
     
  16. Magu

    Magu New Member

    7
    Aug 6, 2019
    300 Weekender 1976
    Not sure
    Guys thanks so much for all the comments, it might be that I'm using wrong terms.
    I wanted to know how to discharge water from the toilet, the black water.
    After my wife spent hours chasing the lines and pipes, it is a rectangular white box located behind the seat on the deck.
    Turns out that in this boat model and year, the button to discharge the sewage is located at the front panel, between the mph counters.
    And it seems that the boat is old enough to fit into the "who knows what's been done over the years" category as noted by Lazy Daze kkkkk
    Thanks again, now we're chasing a leak o_O
     
  17. NotHerDecision

    NotHerDecision Well-Known Member PLATINUM Sponsor

    Jun 28, 2016
    Houston, Texas
    2001 Sea Ray 460 Sundancer
    2014 Seadoo 155 LTD
    2105 Seadoo 130 SE
    2013 Mercury Dinghy
    Cummins 6CTA 8.3L
    Magu

    You cannot discharge black water at all unless you are out to sea and I’m betting you are not. You need to have the tanked pumped at a pump out station. This is a serious offense and the USCG would issue a hefty fine for doing this.

    Josb
     
  18. Loyd Dinneen

    Loyd Dinneen Active Member

    318
    Jul 29, 2017
    Las Vegas
    1977 Sea ray 240 SDA cruiser w/ twin 470 mercs.
    Twin 470 Mercruisers
    Think about it once you pump all that crap out while your in your slip where will it go, all around your boat and onto your hull and stinking up the whole area. Think about that!!!
     

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