The Black Algae Bloom Attack(continued) Page 3
Make it toxic
For the next couple of days, you want to make the water toxic to black algae. In addition to the chlorinator, you will need to shock the pool at double your normal rate. For me, I usually shock my 31K gallon pool at a normal rate of three bags of shock. For a black algae bloom attack treatment, I shock the pool at the rate of seven bags. Add the shock to the entire perimeter of the pool.
Rub those spots
Install a new chlorine tablet in the tablet holder. Attach the tablet holder to the pool pole. Rub every suspected black algae spot in the pool with the chlorine. Make sure that you can see the chlorine(looks like a chalk mark) mark on the black algae spots.
What next?
Run the pool filter for the next twenty-four hours. The following morning brush down the entire pool with a large wire brush(a large wire brush makes this job easier to do). Grab your tablet holder and rub any black algae spots that are not responding. You should expect to see an improvement in the black algae situation. Improved equals to some spots have disappeared but not all spots are gone. If you do not see any improvement repeat the procedure(brushing/tablet holder use) for the second day. That does not include adding shock again.
If you see improvement brush down the entire pool every day for an entire week. Continue to run the pool pump continuously for another day. Use the tablet holder on any resistant spots every day. On the third day add a pool clarifier to pick up any small particles of black algae that are in the water. Backwash the filter several days after adding the clarifier.
Post Mortem
Phosphates can enter the pool a few different ways. The most common cause is leaves and organic debris.
You should see a different pool after several days. Black algae being what it is it will be easier for it to return to your pool. Be vigilante keep an eye on those resistant spots in the pool. Use your tablet holder at any sign that it may be trying for a comeback. Have your phosphate levels checked and reduce them to deny algae a food source.
Related Article: Hard Lessons Learned on Pool Water Chemistry
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