How To Remove Green Algae From Concrete

How to remove green algae from concrete

There are many different ways a homeowner could remove ugly green algae from their concrete surface. If you do a simple google search, you will find articles and videos explaining what to do. This short how-to article will cover the best and long-term way to keep algae from growing on your concrete.

What to Do

The best way to remove green algae from concrete is to use a household cleaner known as bleach. Many people say to use water and vinegar; however, bleach is stronger and will keep the algae spores allowing those green algae to die faster and stay off the surface for longer. Anyone can find bleach at a hardware store or your local convince store. The only problem with trying to clean organic growth, such as green algae from concrete, is that the store-bought bleach is highly diluted and can take many bottles to get rid of the algae.

One recommendation if you're using store-bought bleach is when you apply it to the affected area on the concrete, don't cut the bleach with water, apply the bleach straight on the surface, allow it to sit for about 10 minutes, then rinse away with good pressure from a hose or a pressure washer. Also, if you can't stand the smell of bleach and want to mask the scent, you can mix the bleach with soap-like laundry detergent or dean dish soap to help the strong smell of bleach go away. Removing green algae from concrete all depends on how thick the organic growth is. If there is just a small amount of algae, you can use store-bought bleach and rinse away with some pressure from your house. However, if you have a lot of green algae growing on your concrete, you will want something more substantial to get rid of the algae and keep it from growing back so fast.

Stronger Methods

This method is something the professional pressure washing companies use when dealing with thick growth like green mold or green algae. You will want to locate your nearby pool store, go to the store and ask for some pool shock or pool chlorine; this is the same thing as bleach in a bottle; it's just at a stronger percentage. Pool chlorine comes at a 12.5% strength whereas store-bought bleach is around 2 to 4% strength. Using the stronger bleach, you can be sure that the green algae on your concrete will go away. You need to dilute the 12.5 bleach with some water before applying to the area you want to treat.

The best way to apply this chemical is by a pump-up sprayer or put into a spray bottle. Let's say you have a 5-gallon pump-up sprayer. You would put half of the pool chlorine in the pup up sprayer and fill the rest with water; this will give you a 50/50 mix. Spray that 50/50 mix all over the green algae, let it sit for about 10 minutes, then rinse away with light pressure. You should see a huge difference and your concrete surface coming clean and looking newer again. However, these are strong chemicals and requires a lot of time and work to remove green algae; you might want to consider hiring a local pressure washing company to come out and handle the job for you. If you decide to tackle the job of removing green algae from concrete, then go to your local pool store, get yourself the 12.5 % bleach and a pump-up sprayer, mix it 50/50 and spray on the concrete.

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