I'm running one, just got sick of manually topping off. It paid for itself over the summer as my place has a ton of windows and lots of natural sunlight.
I'd recommend the Tunze Osmolator, super simple to install. Just keep the Top Off tube out of the water or use a check valve. I kept mine out of the water just because if you don't it will back-siphon. The instructions don't mention any of that, I had it submerged, so guess what happened to me? Haha!
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It all started with ............. "Finding Nemo"
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