Do NOT let it turn into a swamp, no matter what your plans are. It's WAY too much work to clean a swamp!
Add 3 gallons of plain 6% household bleach, per 10,000 gallons of water. Continue with 3 gallon doses every 12 hours till the algae has changed from green to brown or cloudy blue. Do you have a testkit? If not, read the testkit page in my signature. (Strips do NOT count!!)
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