Cleaning up swamps can be uneconomical. In years past, when I serviced multiple very large commercial pools, I'd sometimes have to clean a swamp. Usually, I'd dump 3 - 4 gallons of 15% industrial bleach for every 10,000 gallons of pool water (30 - 50 ppm). It would turn gray within an hour and cloudy blue within a day.

But I was buying fresh bleach at ~$0.50/gallon. That was MUCH cheaper than any form of chlorine you or most pool owners can buy.

Test with the DE; give me what test results you've got; tell me what color the pool is; and ORDER the K2006!

One really important point: killing algae is much easier with one very large dose of chlorine, than with 4 smaller doses. The small doses allow the algae to recover, and tend to be wasted.