Macerator Pump for Shower drain?

[anjou]

Sump pumps in a box, like the Rule, are a problem waiting to happen.
To make it worse, they are in a sealed box, at the lowest point, so when it stops working, usually as a result of blockage from hair and soap scum, the first thing you have to do is open the sealed box which is full of crap and water. Thats all going to spill out making even more mess.

A diaphram pump is like a heart, it needs the one way ,non return, tri cuspid valve to prevent the previous surge from returning, allowing the next stroke to fill the ventrical.

[Captain Bill]

Macerator pumps do not handle hair!!!!! I've had mine apart so many times I've lost count. Last time I had them apart I took off the macerator blade. I have now gone twice as long as usual without a problem. Hair doesn't get cut but merely wraps around the cutter shaft eventually slowing the motor enough that it won't pump. I used a hair strainer on the drain which helped but didn't totally prevent the problem. I suggest not using a macerator pump on the shower.

[SV Demeter]

Whale pump installed with supplied check valve, siphon breaker, and routed to thru hull. Nearly all plumbing work is done, electrical system is done. Mounting new steering pedestal tonight and making up new steering cables. Thanks to all here for their suggestions.