On 6 Sep 2006 15:27:24 -0700, "Bob" wrote:

I am restricting the output flow using a ball valve so that I do not
overflow my waterfall, but I thought that this was acceptable. I do not
see how restricting the output flow would increase the likelyhood of
the pump losing it's prime.

The input side consists of a 1 1/2" swing gate valve (to prevent the
input line from losing it's prime when the pump is shut off), 5' of 1
1/2" flexible PVC, and a 1 1/2" strainer. I do not believe that this
is causing any significant restriction.

What is the gph of the pump? 1-1/2" input may not be big enough.
~ jan
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