Step 1. Balance water. See "Ideal Water Balance" . Pay close attention to Alkalinity, Stabilizer (Cyanuric Acid) and Calcium levels. If a calcium based chlorine is being used, discontinue until AFTER the water is cleared. If water is stressed, the solution to the problem may be draining and refilling with fresh water!

Caution! Should ground water be present, the pool can float!

Step 2. Clean Cartridge Element or Backwash Filter. If filter pressure remains high, replace Cartridge Element (annual) , change sand (every 1 - 3 years), or clean D.E. internals (annual), whichever is applicable.

Step 3. If applicable:

• If Total Chlorine exceeds Free Chlorine by .5 p.p.m., or is less than 2.0, Shock pool.
• If Low Chlorine or Chlorine Free pool, Shock with Mono-persulphate or Sodium Dichloro Granular if a bioquanide type sanitizer is not normally used.
• If Chlorine Generator present, turn operation level up.
• If Ozone generator present, Increase operation time.
• If Nature2 system is installed, increase run time to continuous (minimum 23 hrs. daily) until clear. Shock with MONOPERSULPHATE or Sodium Dichloro Granular
• If non-boosted pool sweep is present and plumbed on the pressure area between the pump & filter, turn valve OFF and DO NOT OPERATE POOLSWEEP UNTIL WATER IS CLEAR. Water that goes to these type of cleaners after the pump and before the filter, does not go through the main filtration and sanitizing system!

Step 4. Net or vacuum bottom of pool "Blind". Any organic debris left in pool can diminish the sanitizer's effect. Brush floor and walls also, as algae will cling to surface areas. Add Poly-Quat type Algaecide to begin killing the algae. Adding a metallic type of algaecide such as copper or silver base CAN be very effective, but can and will cause slight staining of the surface areas. If staining is not a problem (or possibly unavoidable because the Algae is already staining), a combination of silver and copper algaecide can be VERY effective in killing the infestation, but the pool must be brushed regularly to make the Algae growth disappear (and the Algae stains may not go away for a Long time).

Step 5. Add Natural Enzymes for aid in breaking things down, add polymer clarifier for linking particles to make large enough for filtration.

Step 6. Operate equipment (with main filter getting the water) 24 hours continuously (maybe for several days, not just one day) until water is clear. Maintain Sanitizer Levels above 3.0 p.p.m. and observe filter pressures for needed backwashes / cleanings.

Step 7. After all traces of the Algae is gone, add a sequestering agent to help remove the stains. Ascorbic acid (vitamin C) or Sodium Erythorbate can sometimes help. Using a phosphate eliminator, to insure against future algae infestations, is recommended.