Yes, love using the Country Fill, my main regret on our 2015 jayco 29mv vs. our old Southwind Class A was a huge loss of fresh water capacity.
But if we have fresh water available we fill up our tank with the country fill. Have not tried reversing the screen, sounds good to try, but did find that flipping the country fill knob to other settings like city fixtures and back to country again while pump,is running seemed to start the suction process.
Takes bout five trips with a 5 gallon jug to fill full till water runs out of overflow. I bought a collapsible dolly from Costco, that saves my back for transporting the jugs.
Also installed on-off valves on all 3 overflow hoses, shut valves to off when on road, prevents losing almost half a tank of water when on the road, open valves when we stop, can still flush toilet, get small dribble from faucet without problem, or causing tank to compress without venting.with valves closed.
This is a big problem with this type tank on Jaycos, a really crummy design.
Look at Jayco blogs for how many owners have solved this water loss problem.