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Reviewed April 2007

Pool Tips
Algae Treatment

You must read all of the Liability Agreement before taking any action, especially all safety and liability warnings.

Green - Black - Blue/Green - Mustard
For "Pink" or "White" algae, (which are not really algae) see Bisolime Background or Bioslime I and Bioslime II

Pool Size: _____________ gallons.

Sanitizer System:
Chlorine
Baquacil
Softswim
Bromine
Other ______________________________

  1. Test sanitizer and pH levels. Adjust the sanitizer to normal levels, and the pH to normal or high, depending on your decision in step two. Vacuum or scoop all debris from pool bottom.

  2. If you can see the bottom of the pool, skip to step six. If you cannot see the bottom, remove most of the live algae by floccing the pool.

  3. To floc the pool, and remove most of the live algae, raise the pool water level to near the top of the skimmer. You will be losing 1-3 inches of water in three days. Re-test the pH, and raise to 7.8 or above (Baquacil Pools) or 7.9 or above (chlorine or bromine pools). Brush the walls to put the algae into the water. Note: quaternary and didecl algaecides will interfere with the floccing action at high levels. Polyquats interfere at very high levels. If you have already added a large amount of algaecide, the floc may not work. If you need to add algaecide before trying the floc, use an elemental copper algaecide.

  4. Mix the correct amount of floc: ______________________________ in a bucket of pool water, spread evenly over the pool's surface, and shut off the filter. Do not disturb the pool by swimming or filtering for one to three days.

  5. When the algae has settled to the bottom, vacuum to bypass or waste — not on filter or backwash! If you do not know how, ask us to show you. If you do it incorrectly, you could damage the filter.

  6. Now immediately kill the algae. If you wait too long, the algae may grow out of control. Re-test the pH, and if necessary, adjust to a normal level. Add a normal dose of shock to the pool: ______________________________. Immediately thereafter, add an initial dose of algaecide: ______________________________. Remember, never mix chemicals together. Add them separately to the pool.

  7. Brush the walls and floor well, to break up the algae and to allow the poison (the shock and algaecide) to come into contact with all of the algae.

  8. Filter 24 hours a day until the water clears. If it does not clear in 4-6 days, add a clarifier, or ask us for a water clarity treatment.

  9. Return to your normal 3-step chemical usage (sanitizer-shock-algaecide) in whatever method you normally use.

  10. If you have mustard algae, or black algae, and it returns one to three weeks after following this treatment, treat it the second time, with Bioguard Mustard Buster or Target Yellow and Black treatment (a chlorine enhancer) and Burn Out Extreme or Super Shock. Follow the directions on the Mustard Buster or Yellow and Black treatment—they will contradict the shock directions and our directions here. These chemicals are not compatible with Baquacil, but we've never seen mustard algae in a Baquacil pool.

Please let us help you, anytime.

IMPORTANT

Pool Size: ___________ Gallons Technician: ___________
Date: ________________

We write Pool Tips for the exclusive use of our own local customers. They are meant as a summary of general information, to be discussed in our store, with our staff, to determine which items are best for specific pools. Pool Tips are a trademark of Gull Group, Inc. All rights reserved.

Our suggestions assume that you have given us a proper description of your pool's size, history and symptoms. Sometimes we can figure it out, sometimes we can't. Your doctor has years more training, far better diagnostic tools, and makes way more money—and sometimes he or she gets it wrong, too.

  1. Read all labels carefully, and only use chemicals exactly as described on the label. Never mix chemicals together outside of the pool. Some of them can cause a fire or explosion.
  2. Do Not follow any advice or suggestions here without coming into the store, customizing them to your specifics, and receiving them in writing.
  3. Do Not print these out or reproduce for any purpose whatever. They are all copyrighted, and we take our copyrights very seriously.
  4. Don't Blame Us for anything. It's free advice, and worth the price paid. We're trying to help, but pools are complex, and chemicals and electricity are dangerous.
  5. Our Best Advice: Go find a local pool dealer who knows what they are doing, become a steady customer, and give them a chance to learn about you and your pool. Pick a brand, pick a store, and stay with them.

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