BioAdvanced 2-in-1 Moss and Algae Killer and Cleaner, Ready-to-Spray, 32 oz, 500 SQ FT

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

It helps remove moss, but takes repeated applications to get rid of the problem moss.

Worked great on the moss and didn't hurt the grass.

It didn't work! Not only did it NOT kill the moss covering our pavers, but it didn't faze any of the weeds that had grown up with the moss! I would like a full refund!

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.

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.

This moss and algae killer worked incredibly well on our cedar fence. It was very easy to use, and we started seeing results much quicker than expected. It removed the buildup without damaging the wood, and our fence looks so much cleaner and refreshed now. I also appreciated how simple the application process was,no complicated steps or hassle. Overall, a highly effective product that delivers fast results and is perfect for bringing outdoor surfaces back to life.

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