Originally Posted by seamaster
My intake will be 10-15 inches below surface but I will still prefer to have a oil separator as i have 2 membranes and it will be expensive to replace them.
My concern is that the water intake is not too far from the propeller
wash area, therefore it might get some air in. that will destroy the membrains and possibly the HP pump.
Another question that I forgot to post in my original posting
was to define if there is need for a scooper or just regular through-hull?
It's true, you shouldn't make water where you think there might be oil present in the water. But it's actually fairly rare that membranes suffer from oil damage. A lot more membranes are replaced from lack of care and understanding of how to take care of ones watermaker
than they are from oil damage. In fact the vast majority of small boat watermakers don't have any oil filtration protection at all. It's a bit of over kill, but if it makes you feel more comfortable I still like VMs little separator. If works on a vortex principal, uses no power or cartridge, and is quite effective. Most watermakers can handle the small amount of air that gets into the tru hulls from normal operation. If you are in a power boat
going 10+ knots then I would recommend not running your watermaker
as you can introduce more air into the system. A forward facing scoop on your thru hull
is a important feature especially on smaller watermakers. A straight thru hull
has a tendency to create a small vacuum as your boat moves through the water. Similar to the effect you get when you blow across the top of a straw. Many smaller watermakers are sensitive to a negative vacuum on the intake side and production can be affected on many of them.