How to Remove Algae From a Patio

Written by sal marco
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How to Remove Algae From a Patio
Remove slippery algae to prevent slip and fall accidents. (Jupiterimages/ Images)

Algae require wet or damp conditions to survive. It grows on patios and other structures around a home that has adequate shade. Overgrown trees and shrubbery cause excess shade on the patio and allow the surface to remain damp, making it a perfect growing environment for algae. Algae can make the patio slippery, resulting in a hazardous situation. The slimy green growth also takes away from the patio's aesthetic appeal.

Skill level:

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Things you need

  • Chlorine bleach or ammonium sulphamate
  • Spray bottle
  • Garden hose

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  1. 1

    Trim overhanging bushes, flowers, grasses and trees. Trimming the growth will allow more light to shine on the patio, which will help to eliminate an algal environment.

  2. 2

    Pour equal amounts of chlorine bleach and water into a spray bottle or mix ammonium sulphamate with water according to the package directions. Ammonium sulphamate is an herbicide, found at gardening supply stores.

  3. 3

    Apply the mixture of your choice to the algae and allow it to sit for 30 to 60 minutes.

  4. 4

    Rinse the patio thoroughly with plain water. Direct the stream and flow of water away from any vegetation that you want to keep. Ammonium sulphamate is not exclusive to algae; it will kill any plant it meets. Repeat the treatment if necessary.

Tips and warnings

  • Wear safety glasses and gloves when handling chlorine bleach or herbicides.
  • Keep trees and bushes trimmed to prevent future algae growth.

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