On Tue, 9 Apr 2013 16:24:39 -0700 (PDT), " firstname.lastname@example.org"
I don't think it makes much difference. With larger gravel, your
first attempt to put the pump down might leave it sitting on one high
corner, so that it rocks but a) after it's connected to the fixed
output pipe, it won't rock, b) before connecting, you can use your
hands to take out the high places. It will take an extra 5 minutes or
less. That's what I would do.
I would buy the smallest concrete paver I could at any landscaping
store, drill a hole through it at one corner and put a bolt and chain
through that hole so you can pull that paver out of the pit if you ever
need to. Set the paver down on whatever you have (crushed stone OR
gravel), and then set the sump pump on the paver. A sump pit will have
a grate around it's base to sift out anything too big to go through it,
but it's better if no stones go through it at all.
Elevating the pump a bit by setting it on a paver will ensure you don't
suck up any stones. The water in your sump pit will be 2 or 3 inches
higher than normal, but that doesn't matter.
Either one is OK
Even better, drop a cinder block into the hole if one can fit, so that the
holes are facing up
Put the pump on the cinder block.
This way your pump is a few inches above the rock/gravel, and there is no
chance of any getting sucked up into the pump.
Alternately get a grass paver
That works even better
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