I know i am about 2 pages late to this discussion

, But the sluice works perfectly for creating infinite water. It only requires one bucket of water to start it up, and it comes before the pump if memory serves?
I actually use one Sluice to run my entire sprinkler system (close to 30 sprinklers now spread out, 1 main reserve tank hooked up to the Sluice 24k mb wooden water tank). I use a single valve connected to the tank to turn the system on and off (yes i have other valves for separate branches). When i flip the switch it can drain the reserve tank down to half. But the Sluice will kick on, and refill the reserve tank and keep the entire system running forever.
I use another Sluice to power all my machinery and smelting needs underground, mostly because i was being lazy and did not feel like piping it all the way underground.