I'm gonna go with a sand filter, not screen. I'll need to make sure it can back flush every once in a while. But it will kill less living stuff in the water than a screen, and foul less frequently.
Also, I don't need a pump that has a 1 1/2" discharge. Most garden hoses are 5/8" and some 3/4", so that tells me there is too much water for use as small scale irrigation. You get either pressure or flow. The ones that have pressure are ridiculous, as they are for larger scale irrigation systems, and cost hella lot of cash. I don't want to spend $1,000 or more for what I need.
I probably need to look at screw type pumps rather than centrifugal pumps. The former get pressure, while the latter is better at volume needs. Both are positive displacement pumps, but screw pumps are not variable flow like centrifugal pumps. Meaning I could reduce the flow, but would not raise the pressure at discharge.
Does anyone use an non-motorized reel type lawn mower, to be the most green, while still keeping a traditional lawn? I've thought about it off and on for years, but have not done so due to needing to keep the grass shorter, and rolled more often, and watered more too. Dunno, maybe it's worth the extra exercise and mow everyday.