Ok heres the deal:

I was trying to figure out how long it would take for me to siphon 5 gallons

it took me 4 mintues to siphon 5 gallons of water

This is my formuala

60/4=15 then 15x5=75 so then its 75gph. am i right or did i screw up?

if this is roght what size of pump will i need for bringing up water? ( in gph form) I was looking into a canister filter to do this, chioces are,
Aquarium Pharmacuticals RENA FilStar xP canicster filters
xP1 250gph $ 69.99+sh
xP2 300gph $ 85.99+sh
xP3 350gph $ 109.99+sh

ViaAqua Canister filter
Model 230 160gph $ 49.99+sh
Model 300 210gph $ 63.99+sh
Model 650 265gph $ 71.99+sh
Model 750 315gph $ 79.99+sh