UV filter pump placement on a pond???

[Mr Cob]

I have a 1000gallon pond that I'm redoing.

I just purchased an out of pond filter, UV, and two pumps.

My questions:

1) Do I place the UV before the filter or after? I'm thinking after.

2) Also if the UV is after the filter does my second pump go before or after the UV? I would say this is an easy one and it would go before the UV and after the filter.

So.....Pond, Pump, valve, Filter, valve, Pump, valve, Uv, pond

3) I'm also installing pvc control valves for control of everything but my UV manual says not to install pvc valves from the aquarium to the Uv.??? "Huh?" is what I said! Any one know what this means???