Safer Brand 5324 Moss and Algae Killer and Surface Cleaner, 32 oz. Hose Sprayer

Safer Brand Moss and Algae Killer and Surface Cleaner effectively kills algae, mosses, lichens, liverworts and grime.

Quick facts

  • Enter your model number above to make sure this fits.
  • This all-natural algae killer utilizes the natural effectiveness of potassium salts to rid your deck, roof, siding, walkways, lawn and more of algae and moss
  • Ready-to-use formula attaches directly to your hose for an economical and convenient organic solution to your algae problem
  • Kills algae, mosses, lichens, liverworts and grime
  • OMRI Listed and compliant for use in organic gardening
  • Contains potassium salts of fatty acids (40%)

Top reviews

safer moss and algae killer

i purchased this product to kill algae and moss on a small part of my shingle roof and my brick patio.i used the product at four different intervals.the results were very poor,the same moss and algae are still there.i followed the directions on the leaflet attached to the hose end bottle, it also says it is hazardous to humans and animals. i absolutely do not reccomend this product because the results make no difference from the original condition when i applied it dave d
JenniferFred, TX

Amazing stuff!

With a 10 minute spray the moss on the shady side of my house (cedar shingles) was completely gone/dead/faded in 3 days; better yet, four months later (late spring through summer) there are no signs of the moss coming back. It’s great when something really works as advertised.
TifanyPearce, AZ

Kill moss safely

I have a moss problem on my brick walks, as well as other places around the house. I used this, and it does a good job of killing about 85 per cent of the moss. The hose end sprayer works great, but I would just warn any users that the fatty substance that comprises this product is an eye irritant, so use protection. Repeat sprayings are necessary, but this is far safer than using some dangerous chemical–it’s basically strong soap.
AlyshaMinot, ND

Didn’t work for me…

I purchased this elsewhere to kill off moss that was growing all over the better part of our front lawn and around the tree bases. This was the only product that the retailer I was at had available for purchase that was billed to kill moss safely without killing the lawn as well. One week later the moss looked no less healthier than it did prior to spraying. I had some left over in the bottle and reapplied with no further results over the next week. I do not recommend this product and I will be trying the Scotts brand granules next as the reviews on that product are great and it is actually cheaper than this.
ChuBarkhamsted, CT


I ordered the Safer Brand Moss and Algea killer to kill Algea growing on part of the North facing roof of our home. First I washed the area with a pressure washer which washed away most of these algeas. I then used this product to kill any of the residual algeas close to the roof flashing. I did use the product on a day when the temperature was 65 degrees or higher. It did not show much of a difference. A few days later when I was looking at that section of the roof it still looked green.I will try it again in late spring next year to see if it produces any better result.One generous application should have done the job!Not very pleased.
I repeated the application again in June 2012 and am happy to say that the moss spray worked like a wonder. The moss growing on the roof facing north is now completely dead!
A vigorous shaking of the bottle is required and there is a little push button next to the spray gun which must be completely pushed out. I will give it a 5 star rating!
StephaniDallas City, IL