I must say those are very GOOD links!!!
Note on the 2nd link, what type of hose is is using vs the first one. The smother hose will give you more GPH flow. What they (Rule or any of them) don't tell you is, the pump rated at zero feet. In other words, take a 500 GPH pump, put a 6 FOOT hose on it, that now has to pump say 2ft UP. The output could be down to 450 GPH.
I leave the stock pump alone, and add a 2nd one for the above reason and if the other burns out, clogs or anything. You have the 2nd one to fall back on.
