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11-03-2020, 03:48 PM
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#1
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Veteran Member
City: New Port Richey Fl
Vessel Name: Blessing
Vessel Model: Jefferson 42
Join Date: Jan 2019
Posts: 38
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Waste tank needs cleaning
The waste holding tank on my Jefferson 42 should hold 40 gallons. Lately we have noticed it fills fast and needs to be emptied frequently. Today we went out past the discharge limit and emptied the tank. We also flushed it with sea water from the deck wash down hose then emptied again. I should mention that I have a clear tube from the exit point at the bottom of the tank to the masarator so I can visually inspect the fluid level.
We then poured 5 gallons of water down the deck waste plate and the water came to the top of my site tube. We discharged that to empty then poured in 2.5 gallons and it came half way up the site tube. Conclusion we have 35 gallons of solid what ever filling the tank.
What is the best product for dissolving those calcified solids so I can regain my full capacity?
Thanks.
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11-03-2020, 03:53 PM
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#2
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Moderator Emeritus
City: Au Gres, MI
Vessel Name: Black Dog
Vessel Model: Formula 41PC
Join Date: Jul 2015
Posts: 21,185
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Ted, OC Diver had a good thread on this not too long ago. Try the search function and see if you can find it. If not you cam send him a PM and I am sure he cab point you in the right direction.
__________________
Boat Nut:
If you are one there is no explanation necessary.
If you aren’t one, there is no explanation possible.
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11-03-2020, 04:10 PM
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#3
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TF Site Team
City: Seneca Lake NY
Vessel Name: Bacchus
Vessel Model: MS 34 HT Trawler
Join Date: Nov 2014
Posts: 7,826
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__________________
Don
2008 MS 34 HT Trawler
"Bacchus"
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11-03-2020, 04:24 PM
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#4
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Guru
City: Vallejo, California
Vessel Name: Mahalo Moi
Vessel Model: 1986 Grand Banks 42 Classic
Join Date: Jun 2008
Posts: 2,093
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I don’t quite understand your “sight” tube setup. Do you have a “dip tube” that reaches the bottom of the tank? And do you pull from the top of the tank (ie dip tube) when pumping out? It’s possible that your dip tube, especially if it’s metal, has rotted off at some point near the top and you’re only pumping down to that point. Happened to me.
__________________
Ray
"Mahalo Moi"
1986 GB-42 Classic
ΜΟΛΩΝ ΛΑβΕ
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11-03-2020, 04:32 PM
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#5
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Veteran Member
City: New Port Richey Fl
Vessel Name: Blessing
Vessel Model: Jefferson 42
Join Date: Jan 2019
Posts: 38
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I installed a clear plastic tube from the bottom Suction fitting of the waste tank to the Suction end of the mas pump.
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11-03-2020, 06:41 PM
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#6
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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The only thing I would add to my thread on tank cleaning in your situation is to let the solution sit for a week or two and then let the boat roll in some beam seas before pumping out.
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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11-03-2020, 08:31 PM
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#7
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Guru
City: AR
Join Date: Jul 2009
Posts: 2,515
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I'd bet $1 that you don't even have 2" of "solid whatever" in the bottom of your tank...that the real problem is one of two things:
1. Your discharge fitting is on the top of the tank with a metal diptube that used to go to the bottom of the tank, but has been eaten through by urine and has either broken off at at about 35 gal level or has holes in it at about that level.
2. You have a seriously blocked tank vent--not the vent line...it's more likely to be a clogged vent thru-hull and/or the other end of the vent line--the vent fitting on the tank and/or that end of the vent line.
--Peggie
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11-04-2020, 10:18 AM
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#8
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Veteran Member
City: New Port Richey Fl
Vessel Name: Blessing
Vessel Model: Jefferson 42
Join Date: Jan 2019
Posts: 38
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I will pm you with my address so you can send that $1.
My discharge is at the bottom of the tank with a 1.5” clear plastic tube connected to it going up to the maserator pump.
I removed the vent line from the tank fitting and am able to blow air out through the vent as well as into the tank.
Perhaps I should have mentioned earlier that this boat sat for a year with no activity and most likely a full partially tank Before I bought it. Upon possession I had it pump out at our first nights stop.
As said in my original post we emptied the tank twice to the point where no water was visible at the bottom of my clear site tube and were only able to pour 5 gallons of water into it before reaching the top of the site tube at the maserator.
We will be trying Teds cleaning procedure today with follow up posting.
Only kidding about the $1.
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11-04-2020, 11:59 AM
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#9
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Guru
City: Southport, FL near Panama City
Vessel Name: FROLIC
Vessel Model: Mainship 30 Pilot II since 2015. GB-42 1986-2015. Former Unlimited Tonnage Master
Join Date: Oct 2007
Posts: 4,984
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Good Luck! Hope you will fill us in (pun intended) on the eventual solution.
__________________
Rich Gano
FROLIC (2005 MainShip 30 Pilot II)
Panama City area
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