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I presume you need to manually top off the system for evaporation?

In rainy weather, is losing nutrients to overflow a problem?

Any thoughts to using a 12VDC pump, powered by a solar panel and small battery? (In some places it is illegal to have an extension cord outdoors for months on end.)

Would it be easier/cheaper to ship a version that didn't include the kiddie pools or sand, with the expectation that someone could source those bulky items themselves?

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Yes, you would need to top off in times of little rain.

Unless you have a ton of rain, I don't see losing the nutrients as a problem.

That is something I looked into. For $150-$200, you can buy a kit containing the DC pump, a battery, a solar panel, and a timer.

That is something I considered, but I thought it would be simpler to start off with just one offering.

Is there some provision for the over-watering (rainy) scenario? I would be interested if this were accounted for...

Yes, I drilled a small hole near the top of the fish tank. I'll update my blog to mention this.

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