Martin Gross, CEO of Gross-Wen Technologies, created a way to clean wastewater using algae, and the byproducts can be useful in the ag industry.

If you're suddenly greeted by a green, mildewy growth on your house, there are steps you can take to remove (and prevent) it.

After the insurance non-renewal, the couple hired a roof inspector who told them their roof is good for another 20 years. "Perfect, I don't see nothing wrong with it," he said.

Up until last month, when they received a non-renewal letter from the company claiming aerial footage found “moss, mildew, algae, and mold” on the roof.

With infrequent use, the algae, mold and bacteria can build up. When the jets are turned on, some of the buildup is knocked loose and it floats around in the water, appearing as black specks.

Mold: Relatively rare on roofs, but when it does appear, it’s likely the result of algae left on the roof too long, which makes the shingles perpetually damp, and a good home for mold.

For algae, mold, and mildew to thrive, they just need three things — and sometimes just two! Typically, some algae, mold and mildew need: the spores, food and water.

Up until last month, when they received a non-renewal letter from the company claiming aerial footage found “moss, mildew, algae, and mold” on the roof.

For algae, mold, and mildew to thrive, they just need three things – and sometimes just two! Typically, some algae, mold and mildew need: the spores, food and water.