Since it is such a low volume pool, honestly, I would just drain, clean and refill. UNLESS you fill from a metals-contaminated well. If that is the case, you might want to just work to clear it up.
In the future if there is ever a time when you have no pump or no power due to a storm or something, you can keep it from turning green by adding some bleach to the water each day. Two years ago, we had a huge storm that came through my area and knocked out power to almost the entire state. I had no power for a solid week and we had daytime temps in the 100s all week. I kept my pool from turning green by doing just what I suggested above ---- adding bleach every day. The water was still clear a week later when the power was finally restored.
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