So would I! I've just purged a little 12V one from my system because it failed (the positive lead came adrift). I already knew not to use it making wort because it has an "enclosed" impeller which makes them very efficient but they bung up with debris as quick as look at them:... I’d go for the first option.
Those little brown (usually) "solar" pumps are not so bad, having an open impeller design (don't bung up so easily) and being direct drive (don't have the same unsanitary magnet coupling). But they do have (on the ones I have) a free disc between impeller and body. Sort of semi-open? The disc probably prevents debris jamming the impeller from turning (disastrous for direct-drive) but didn't strike me as very sanitary.I agree with @peebee small 12 volt pumps are easily blocked by "bits" in the wort so you need to take precautions. Also, and it probably applies to all pumps if there's a significant period between brews, I take my pumps apart after a brew and give them a good clean and sanitise leaving them to dry completely before putting them back together. I also store them in the house and not the shed.
Yes, I discovered early on, like second use, after giving them a good flush through this black gunky bits appeared in the water. Took the pumps apart to discover they had grown a nice crop of black mould since my last brewday! As the pump mouldings are held together with self tapping screws I decided to drill out the mouldings so I could fit M3 nuts and bolts. Makes it a bit easier to get them apart and back together again.But as you dismantle yours for cleaning;
Don't get carried away! I did say such pumps were for finished beer. Two issues: The cheap ones (Chinese) will not use food-safe materials and can have very dodgy designed innards (that you don't see); and secondly any muck in the liquid being pumped will trash the diaphragm. I'm using Seaflo models to have some confidence in them being built out of what they say they're built out of.thanks gents, i like the idea of diaphragm pumps use to use a lot of wilden pumps when i was working