[chocophile]

I have a couple feet of metal screening wrapped around the end of our water line to prevent that algae from clogging the screen fitting on the end. I use zip ties to keep the screening in place. It seems to work well.

I leave our line in all year, and I have a chain at the shore connected to a hose clamp on the line. Once or twice, we've had the ice pull the water line off the connection at the shore; the chain keeps the water line from going too far away so I can retrieve it and reconnect.

I agree with the comment to check for an air leak at any above-water connections in the line. I've had that problem and it prevented the jet pump from keeping pressure.