Douglas, I'm becoming a bigger and bigger fan of UV-C. I like the AquaStarPlus also. I would like to expand a little on your comments, both pluses and minuses, on the use of UV-C in general and ASP (AquaStarPlus) in particular.
First, a plus for ASP: the newer Plus unit looks pretty much the same as the original, but is made of different materials. I had a telcon some months ago with an engineer at AquaStar. He told me that the ASP unit looks fragile, but really no longer needs the included 1Liter Lexan bottle to protect it. He challenged me to perform a test that he had performed many times. Throw the "naked" ASP unit (w/o the Lexan bottle protecting it) as hard as i could onto a tile floor. He said it would just bounce around and NOT break. "Naked", w/o the Lexan bottle, the ASP is lighter than the SteriPen (my first UV-C purifier - also a very nice device). The ASP light generating unit is made of a different material than the orginal AquaStar unit.
On the downside, particularly for some geographic areas, UV-C (and chems, for that matter) won't kill larger parasites (i.e. Hydatid tape worms). It would take ~28x the intensity of UV-C light produced by ASP or SteriPen to produce a 98% reduction in viable tape eggs.
Hydatid tapes are endemic to certain geographic areas, though theorectically they could be found in water sources anywhere wild or feral canines are found. The good news is the eggs are about 25microns in size. So, a good silt- / pre- filter should eliminate them before chemical or UV-C treatment is performed.
Here's a link to an earlier post on this subject some info on Hydatid tapes. Also, anyone can search these Forums using the "Search Forums" (NOT the "Search BPL") LINK (NOT the "edit box"/"text field"). The link has a default color of blue unless one has changed their Browser's color scheme.
Lately, after a few years of AquaMira use, i've been moving over to either a pump filter (or gravity filter, a ULA Water Amigo, and a UV-C purifier combination (fitler first, then UV-C). From my personal perspective, better safe than sorry.
I'm also planning, this year or next, to try the First Needs water pump-filter. It has an anti-viral stage like the ExStream. Also, a CamelBak in-line filter when i use a bladder. I'll have to read the box and insert for the CamelBak in-line filter though to see if it has an anti-viral stage. Otherwise, i'll use UV-C first (after prefiltering the water).