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Sharina will have a VacuFlush toilet.
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= Heads= Marine toilets are gravity, push or pull. Gravity types are simple but have to be placed higher then the holding tank. Plumbing has to be fairly straight and downhill. The best location for a gravity head is on the main deck more or less above the holding tank.
The push type uses gravity, compressed air [4], water-hydraulics [10], or a manual or electrical pump to evacuate the toilet and push the contents through the pipes to the holding tank. The pull type uses a vacuum to suck the contents from the toilet down to the holding tank. Of these, only three types are suited to a trawlerboat:• * Manual pump (push)• * Electric (including macerating) (push)• * Vacuum (pull)
In all cases, look for a four-bolt model that minimizes the amount of water in a flush, to avoid the need for an overly large holding tank.
=== Manual Pump === A manual-pump head typically uses a foot pedal or handle to acti-vate activate a manual pump to send the effluent to the holding tank. Man-ual Manual pump heads are not dependent on electrical power, thus reduc-ing reducing the demand on the electrical system. They are very dependable and easier to install, and have relatively low maintenance costs. They can use seawater for flushing. Chief disadvantages are that users must learn how to use the pump (open the intake valve, se-lect select a dry or a wet position); users may not know if the flush is complete to the holding tank; and pipes can get clogged. Typical vendors are Groco [6], Jabsco (includes Par) [7], Lavac [8], Raritan [3] and Wilcox Crittenden [9]. === Electric Head === An electric head uses an electrical pump, operated by a switch. Electric heads obviously impose a demand on the electrical system. They are moderately difficult to install. Typically they also macer-ate macerate solid waste, reducing the possibility of clogged pipes. They are easy to use, and can be fitted with a manual pump for backup.
The chief disadvantage of electric heads is that users may not know if the flush is complete to the holding tank. So they either flush too little, leaving waste in the pipes, or flush too much, using excessive water. Macerating heads require more water to flush than any other type of head – as much as three gallons for solids. Typi-cal vendors are: Headhunter [10], Jabsco [7], Lavac [8], Raritan [3], Tecma [11], Vetus [12] and Wilcox Crittenden [9].
=== Vacuum Flush ===
There are only two vacuum flush systems on the market: Dometic’s electric SeaLand VacuFlush [13] and Lavac’s manual or electric Zenith [8]. The VacuFlush uses an electric pump to create a vacu-um in the system. When a lever is operated, the vacuum sucks the sewage into the holding tank. It uses pressurized fresh water, and only uses 1-3 pints per flush. It requires very little preventative maintenance. Because it uses the onboard water supply, it is sub-ject to ABYC standard H-23, Installation of Potable Water System.
Marine bidets are available from Dometic [13], Headhunter [10] and Tecma (Silence, Sarinautico) [11].
[[Category:SewageSystems]]