[Public-List] Waste pumps

Thu Sep 29 06:55:34 PDT 2011

Mike,

One minute, ten seconds!  Have you ever thought of using it as a bow
thruster?

Roger 148

-----Original Message-----
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Mike Lehman
Sent: Thursday, September 29, 2011 8:09 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Waste pumps

The macerator pump is used to empty the tank in the event that I cannot get 
to a pump out station or when off shore. I have tested the macerator with 
the 1" discharge and it empties a full 14 gallon tank in 1 minute and 10 
seconds...I actually timed it. I used a simple PVC "T" fitting with one side

of the "T" to the deck pump out and the other side to the macerator pump. As

long as the connections are tight (and they better be or you would have a 
sewage leak) you get a positive vacuum to empty the tank at a pump out 
station. This has worked fine for 15 years.

-----Original Message----- 
From: John Boor
Sent: Thursday, September 29, 2011 7:51 AM
To: Bill Wallace ; Alberg 30 Public List -- open to all
Subject: Re: [Public-List] Waste pumps

If you are installing a holding tank why do you need to size the macerator
pump output to a through hull.  I am rebuilding a boat and have decided to
use a macerator pump to the tank, the 1" output from the pump to the tank
I believe is not large enough to allow the tank to equalize when being
emptied so I have installed a vacuum relieve valve made by Dometic
company.

> Hi,
>
> I'm finally going to install a holding tank on my boat.
> Anybody have any recommendations about waste pumps?
> Manual vs. electric?
> Macerating impeller pumps vs diaphragm?
> I was originally going to go with the Jabsco electric
> macerating pump since they seem pretty common, but
> they have pretty bad reviews on westmarine.com
> and anyway I would have to adapt the 1" output
> to my 1.5" through-hull.
>
> Any thoughts?
>
> SG
>
>
> ------------------------------------------------------------------
> Stephen Gwyn                 |  Tel: 1-250-363-3136
> Dept. of Physics & Astronomy |  Fax: 1-250-363-0045
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