2-in-1 Moss and Algae Killer and Cleaner, Ready-to-Spray, 32 oz, 500 SQ FT | Ready-to-Spray - Use on Lawns, Ornamental Gardens, and Patios - Deck Cleaner - Up to 1 Year Protection

Works well on roof

This stuff definitely works at killing moss. Within a few days all the moss on my walkways was dead and brown. The problem is, it doesn’t go anywhere, so then you have to pick/scrape it all out. Also, the most recent bottle I received, the mixing bottle didn’t work. I had to dump it into another sprayer I have in order to use it.

I used this on this tree right before I went to work. You can see the side I didn’t treat to see if I could tell a difference. It’s completely dead! I also used it on my concrete and roof. There is a shady spot on my roof that started to grow moss. I sprayed it today as well. I’m sure it worked the same on the roof. It was pretty bad in all areas. So it will take a few treatments I’m sure. I had no clue that this was a thing. I was so worried about what to do. This product was easy to use. It has a smell but it’s not supposed to smell like nothing. The sprayer could be better but did the job. If you’re like me. A homeowner but can’t afford to pay someone to help keep your house and property free of things that could cause major issues. Then this is the easy way to do it and so much cheaper! I’d definitely recommend!!

I'm not sure if it's something in the PNW but this stuff has no effect and seems useless. Did not have any effect on moss on entry sidewalk. I should add that powders and other commercial products seem ineffective as well. Feels like the entire industry might be selling useless products. Diluted bleach works, this stuff doesn't.

This was easy to set up and use, but it didn't thoroughly kill the moss on my roof. In areas with thinner moss or something that may be lichen/algae I noticed an improvement, but with moss along shingle edges it became a bit brown, but didn't kill it enough to loosen the moss, and the moss recovered. I did wet and attempt to soak all the moss, but I'd suggest trying to really, really, really, thoroughly soak any areas of thick moss with this, very well, in order to ensure it works. I was trying to kill moss on half of a 2 car garage roof, and I'd estimate one bottle for that area (I used less, which I regret). It does appear that this did no damage or staining to my roof, gutters, or lawn in the area where it came down from the gutter downspouts. So that is good.

This product is extremely easy to use, and highly effective. Simply hook to the end of your hose and go. I had a nasty build up of moss on my nice new roof, and after 2 or 3 days of spraying it, all the moss was turning brown. Within a week, it was dead. I'm including Before and After photos that tell the tale. (And yes, the fronts of my gutters need to be power washed! That's coming in two days from today. 👍) UPDATE: I just added the "After" photo. The moss killer did its job as advertised. The power washing then physically removed the dead moss. And I had a gutter guy add a section to connect the downspout from the 2nd story to the horizontal 1st-story gutter to help keep that area more dry. And note the fact that this product will kill moss, but does not make what remains magically disappear. You must mechanically remove the dead moss, and my power washer man made a point to tell me how firmly it clung to the shingles. This is not a ding on this product. Just a fact in dealing with moss. Even dead, its tiny roots still grab firmly to hard surfaces. Seeing this product is so easy to apply, so effective, and inexpensive, I plan to apply it every Spring and early Fall, or at least once every Summer. 5 STARS

I purchased the BioAdvanced 2-in-1 Moss and Algae Killer for Lawns, and I couldn't be more impressed. The formulation is exceptional—professionally developed, concentrated, and clearly designed with effective active ingredients. Application was quick and straightforward, and the product performed flawlessly right from the first treatment. The spray provides smooth, even coverage and delivers consistent, visible results within days. I noticed the moss beginning to darken and die back within 24-48 hours, with complete elimination after one week. The 2-in-1 formula not only kills existing moss and algae but also helps prevent regrowth, keeping my lawn looking clean and healthy. The coverage area is generous, and the hose-end sprayer attachment makes application effortless across large lawn areas. The overall effectiveness and performance exceeded my expectations, especially for the price point. My lawn has transformed from patchy and moss-covered to lush and green. I'd highly recommend this moss and algae killer to anyone looking to restore their lawn's health and appearance without damaging the grass.

Worked great on getting rid of moss but it was leaky to spray