Bleach solution
All you need to eliminate the algae is bleach and water. While you can try using water alone, you will need to wash the siding more frequently to eliminate the algae and stave off new growth.
Bleach is great for killing algae (and other organisms that may lurk in your tanks) and for keeping it from coming back.
TIP 5: USE BLEACH OR VINEGAR
Oxidized bleach immediately starts to kill algae cells once it comes into contact with it. Bleach, however, should not be your first option, especially if the area you plan to rid of algae is near plants or grass.
I've had fantastic success cleaning algae from just about every outdoor surface using liquid dish soap and my favorite exterior cleaning brush. This brush is one that's made to clean RVs. It's got lots of bristles that are about 2.5 inches long and they're soft.
Shock Your Pool
Shocking is the process of adding chemicals to your pool to raise chlorine levels and kill bacteria and algae. We recommend using a calcium hypochlorite shock to treat your algae problems.
In the same way that baking soda can be a spot treatment for black algae, household borax does the same for blue and green algae. Simply use the borax to scrub away algae that's sticking to your pool walls, then use the brush to dislodge it. Follow up by vacuuming up or scooping out the free-floating algae.
When added to water containing algae, H2O2 breaks down into water and oxygen, releasing free oxygen radicals in the process. These free oxygen radicals can then react with and destroy the cell walls and membranes of algae cells, causing them to die off.
Hydrogen peroxide is especially effective against green algae and blue-green algae (cyanobacteria). It is heavier than water and sinks to the ground, which is useful if you're dealing with algae near the ground and somewhat of a hindrance if the algae are higher up in the tank.
In the case of blue-green algae: Use 1.5 to a maximum of 2.5 ml of the 3% solution of hydrogen peroxide per gallon of water. In the case of green algae: 20.25 ml to a maximum of 32.5 ml of the 3% solution of hydrogen peroxide per 13 gallons of water.
Mix two gallons of water, two cups of oxygen bleach, and one cup of borax. Stir the recipe until everything dissolves. Add ¼ cup of dish soap and stir. Apply the cleaning solution and scrub with a brush.
To eliminate and prevent green algae in a swimming pool, start by adding an extra dose of chlorine to your pool to shock the algae and stop the bloom. Let the chlorine work overnight, then test the pH levels of the pool in the morning to see if the pH is back to normal.
Hardware stores and home centers sell products designed to kill moss and algae, but you can save money by using inexpensive chlorine bleach or a non-creamy hand dishwashing detergent, such as Dawn.
Only algaecides can "kill" algae in pool water. However, baking soda can help clear up algae. Use both so you can restore sparkly, clean water!
Vinegar is acceptable to use for killing algae and cleaning a pond when it is drained. The acidic is good at lifting away the stubborn algae deposits and stains without damaging the liner material. When used in this way in limited amounts, the leftover vinegar residue won't hurt the fish or change the pH of the water.
White vinegar can quickly kill algae but is not harmful to birds, insects and the majority of plants. Use a mixture of one part water to one part white vinegar to spray down the area and kill the algae. Rinse the surface algae off the concrete with a water hose.
While bleach will effectively kill any moss or algae growing on your tarmac, if you're planning on dousing your Devon tarmac driveway with bleach, ensure that you use it carefully as it can kill any surrounding plants, and stain your tarmac or pavement.
"Hydrogen peroxide is actually detrimental to wound healing," says Dr. Yaakovian. "It prevents healing rather than promoting it." That's because its reactive power isn't specific to germs.
Another chemical-free solution that you can consider is a mixture of baking soda, water and vinegar. Add two parts of white vinegar to one part of water and three heaped spoons of baking soda. Dip a scrubbing brush into the mixture and apply it to the algae stains on your furniture. Leave it for about ten minutes.
Barley straw is a natural way to fight algae. On contact with water, the straw starts to break down, and as it does so it releases peroxides into the water which combat algae. Available in mini bales, or as a concentrated extract of barley straw liquid, it's a natural way of chemically fighting algae.
Eventually, the algae dies too. Bacteria digest the dead plants, using up remaining oxygen, and giving off carbon dioxide. If they can't swim away, fish and other wildlife become unhealthy, or die without oxygen.
Dead algae has a distinct appearance, looking grayish in color and dusty when it accumulates in the bottom of the pool. Once the pool water is clear, it's easy to see down there.