On Wed, 22 Apr 2015 09:24:04 -0700, Jeff Liebermann
wrote:

More of the same...

I just looked at my sump pump:
http://www.acehardware.com/product/index.jsp?productId=1273396
(For sale, incidentally). I had to add a 1.5" pipe extension and an
anti-backflow spring valve to make it work right.
http://www.poolsuppliescanada.ca/1-1-2-inch-pvc-check-valve-with-spring-female-threaded.html
The problem was every time the pump began to suck air, the water in
the vertical drain hose would flow backwards town the hose and try to
leak out the intake. Turning off the power guaranteed a gallon or
more of water going backwards. The spring valve solved that problem.
Unfortunately, the valve didn't like getting fed rocks, so I was
fairly careful when using the strainer.

Ummm.... duz this pool have a drain? If so, does your HF sump pump
fit into the drain? If yes, then just lower the pump into the drain
and you'll get more than 3" of of water level.
--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558