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Old 12-12-2011, 11:24 PM   #1
Join Date: Apr 2009
Posts: 24
Default Inline macerator

Before I spend even more time, skin and money trying to re-invent the wheel. Or in this case the poo-pump.Maybe somebody here has solved the problem.
I have a LAVAC loo whith the traditional HENDERSON manual pump. It seems that this does not satisfy the local macerating standards.
A friend on a multi successfully simply installed a 12v macerating pump in place of the HENDERSON. On my mono with the loo well below the water line this was a dismal failure as the 12v pump does not have enough suction to draw in clean sea water.
Has anybody tried to install both pumps in line?
Any other suggestions?

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Old 12-13-2011, 05:59 AM   #2
Join Date: Jul 2009
Home Port: St. Augustine FL
Vessel Name: Linnupesa
Posts: 189

Did a similar thing with a weak diesel fuel pump, now working two
cheapies in tandem rather than a single real pricey one alone.
Creating that vacuum with a dry start and leaking (air) seals is the problem.

The "not enough suction" problem could also be overcome by re-siting
the pump closer to the sea cock. Once it is primed with water it
will readily push it up a few feet more in level.

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Old 12-21-2011, 08:12 AM   #3
Join Date: Apr 2009
Posts: 24

Thanks for your suggestions. The problem is a LAVAC specific one. These toilets have no valves or levers and work by pumping out with a HENDERSON bilge pump. The seat and lid are sealed with O rings thus creating a vacuum in the bowl. As you pump out, clean water is drawn in to the bowl via a hose that is looped above the waterline and has a small hole at the highest point. This hole is a combination of a vacuum break and water level adjustment.
I have used these toilets for a number of years and they NEVER malfunction. Unfortunately nor do they macerate to local standards. On boats where the bowl is at or near the waterline just replacing the bilge pump with an electric macerator pump works fine.
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lavac, loo, macerator

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