LETTERS TO THE EDITOR
the closed position. The same problem
often afflicts the float switch within
the sump box. Unless you intend to
clean the check valve (and switch)
regularly, this device may by more
trouble than it’s worth.
The solution for short cycling is
either to reroute the hose so water
does not flow back into the sump
box or to wire the pump to a manual
switch in the head that’s simply
turned on by the user whenever
the shower is used. (Remember
to include a pilot light so that the
switch isn’t inadvertently left on.)
With this approach, check valves
and float switches—the two most
common points of failure in a shower
sump—become unnecessary. Opening
and cleaning the sump and pump
periodically will improve the system’s
MORE ON HULL STRAINERS
I have a Grand Banks 42 with a
375hp Caterpillar 3208 engine and
was using a slotted-type strainer.
In Nantucket, for two consecutive
summers, one of the strainers clogged
with eelgrass and shut down the
engine. As you probably know, there
is lots of eelgrass floating around in
New England. I switched to the Groco
APHS-1250-1 perforated-type strainer,
and I have not had any trouble since.
According to Groco, the smallest
holes allow the most water through,
but as you point out, you have to be
careful when painting over the holes.
I am switching to a newer GB with
a Cummins 450hp engine and am
wondering if that same strainer will be
too restrictive. I think the APHS-1250
is the biggest one that Groco makes.
In your response to Ben Doliber’s
letter in the February issue of
PMM, you mentioned that engine
manufacturers specify maximum
inlet restrictions. Where can I find
this information? Would it be listed
on the Cummins website?
Thanks for your thoughts.
Your question is a valid one, indeed,
and I concede that there are locations
where a perforated strainer, rather
than a slotted one, makes sense.
Restriction can be an issue. Check
out the Groco website to make certain
the overall collective opening of the
perforated strainer equals the size of
the engine intake (see groco.net/08-
BRWSR/ sec-5-view.htm). After
everything has been installed,
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