Green Algae

Green algae is usually seen throughout the water, and clings to walls and steps. If this occurs, it’s likely due to low chlorine levels. Make sure you clean any leaves, sticks, etc. out of the pool as soon as possible, backwash or clean your filters, and use a high quality shock to kill the bloom (2 lbs. per 10,000 gallons is usually enough). Brush the pool and run the equipment until the green is gone. In extreme cases (You can’t see the bottom, or there is an unusually large amount of debris), it may be best to drain, clean, and refill the pool. Consult a pool professional in your area to determine if this might be the best course of action. If the green persists, you may have a state of chlorine demand. This requires a specific, large dose of chlorine to clear up. Your local pool professional should be able to test for chlorine demand and provide detailed instructions.

After the green is gone, use a flocculent or clarifier to remove the dead algae and clarify the water. Clean the filter or backwash again to make sure the dead spores are removed.